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• ALSA buffer xrun induced by low quality source in ffmpeg capture

  8 janvier 2021, par Peter Becich

  I am attempting to transfer some old Video 8 tapes to my computer, though an EasyCap USB stick and the motherboard's sound line-in, on Ubuntu. I believe the arguments are correctly laid out below to capture from two independent streams, and encode them both into the output MP4 file.

  



  Edit :

  



  I can simplify the question a bit, now.

  



  ALSA buffer overrun (or underrun ?) is induced by the unreliable/noisy audio source. For instance, if ffmpeg captures the beginning of tape playback, this causes "buffer xrun" far beyond when the tape gets up to speed and playback should be normal.

  



  It is interesting that the bitrate shown in the ffmpeg log shoots up higher than normal when it's producing a garbage output ! (Is this bitrate a sum of of audio and video bitrates ?)

  



  I've tried a couple of audio encoding codecs, and had the same problem.

  



  Using libfdk_aac :

  



    Metadata:
    encoder         : Lavf56.15.102
    Stream #0:0: Video: h264 (libx264) ([33][0][0][0] / 0x0021), yuv422p, 640x480, q=-1--1, 29.97 fps, 11988 tbn, 29.97 tbc
    Metadata:
      encoder         : Lavc56.13.100 libx264
    Stream #0:1: Audio: aac (libfdk_aac) ([64][0][0][0] / 0x0040), 48000 Hz, mono, s16, 128 kb/s
    Metadata:
      encoder         : Lavc56.13.100 libfdk_aac
Stream mapping:
  Stream #0:0 -> #0:0 (rawvideo (native) -> h264 (libx264))
  Stream #1:0 -> #0:1 (pcm_s16le (native) -> aac (libfdk_aac))
[alsa @ 0x22038a0] ALSA buffer xrun.  0kB time=00:00:00.00 bitrate=N/A    
[alsa @ 0x22038a0] ALSA buffer xrun.1934kB time=00:00:02.76 bitrate=5723.5kbits/s    
[alsa @ 0x22038a0] ALSA buffer xrun.4795kB time=00:00:05.49 bitrate=7150.1kbits/s    
[alsa @ 0x22038a0] ALSA buffer xrun.7668kB time=00:00:08.21 bitrate=7646.1kbits/s    
[alsa @ 0x22038a0] ALSA buffer xrun.1475kB time=00:00:10.94 bitrate=8588.9kbits/s    
[alsa @ 0x22038a0] ALSA buffer xrun.3822kB time=00:00:13.66 bitrate=8289.0kbits/s    
[alsa @ 0x22038a0] ALSA buffer xrun.5388kB time=00:00:16.38 bitrate=7695.0kbits/s    
[alsa @ 0x22038a0] ALSA buffer xrun.6896kB time=00:00:19.10 bitrate=7244.0kbits/s    
[alsa @ 0x22038a0] ALSA buffer xrun.8980kB time=00:00:21.84 bitrate=7118.8kbits/s    
[alsa @ 0x22038a0] ALSA buffer xrun.2032kB time=00:00:24.55 bitrate=7349.3kbits/s    
[alsa @ 0x22038a0] ALSA buffer xrun.4612kB time=00:00:27.27 bitrate=7391.1kbits/s    
[alsa @ 0x22038a0] ALSA buffer xrun.6660kB time=00:00:29.98 bitrate=7284.6kbits/s    
[alsa @ 0x22038a0] ALSA buffer xrun.9123kB time=00:00:32.68 bitrate=7299.3kbits/s    
[alsa @ 0x22038a0] ALSA buffer xrun.0641kB time=00:00:35.39 bitrate=7091.7kbits/s    
[alsa @ 0x22038a0] ALSA buffer xrun.2601kB time=00:00:38.13 bitrate=7002.6kbits/s    
[alsa @ 0x22038a0] ALSA buffer xrun.5828kB time=00:00:40.87 bitrate=7181.0kbits/s    
[alsa @ 0x22038a0] ALSA buffer xrun.8481kB time=00:00:43.60 bitrate=7229.9kbits/s    
[alsa @ 0x22038a0] ALSA buffer xrun.1461kB time=00:00:46.34 bitrate=7328.0kbits/s    
[alsa @ 0x22038a0] ALSA buffer xrun.3982kB time=00:00:49.06 bitrate=7342.7kbits/s    
[alsa @ 0x22038a0] ALSA buffer xrun.6565kB time=00:00:51.77 bitrate=7367.8kbits/s    
[alsa @ 0x22038a0] ALSA buffer xrun.9718kB time=00:00:54.51 bitrate=7471.3kbits/s    
[alsa @ 0x22038a0] ALSA buffer xrun.2341kB time=00:00:57.25 bitrate=7489.2kbits/s    
^Cframe= 1760 fps= 29 q=-1.0 Lsize=   53946kB time=00:01:00.04 bitrate=7360.3kbits/s    
video:53880kB audio:53kB subtitle:0kB other streams:0kB global headers:0kB muxing overhead: 0.022994%
[libx264 @ 0x2217ac0] frame I:8     Avg QP:24.00  size: 55686
[libx264 @ 0x2217ac0] frame P:1752  Avg QP:27.66  size: 31237
[libx264 @ 0x2217ac0] mb I  I16..4: 100.0%  0.0%  0.0%
[libx264 @ 0x2217ac0] mb P  I16..4: 15.0%  0.0%  0.0%  P16..4: 80.2%  0.0%  0.0%  0.0%  0.0%    skip: 4.8%
[libx264 @ 0x2217ac0] coded y,uvDC,uvAC intra: 45.3% 86.6% 59.4% inter: 65.7% 81.3% 11.5%
[libx264 @ 0x2217ac0] i16 v,h,dc,p: 40% 25% 26%  9%
[libx264 @ 0x2217ac0] i8c dc,h,v,p: 45% 24% 19% 12%
[libx264 @ 0x2217ac0] kb/s:7516.07
Received signal 2: terminating.


  



  Using libvorbis :

  



    Metadata:
    encoder         : Lavf56.15.102
    Stream #0:0: Video: h264 (libx264) ([33][0][0][0] / 0x0021), yuv422p, 640x480, q=-1--1, 29.97 fps, 11988 tbn, 29.97 tbc
    Metadata:
      encoder         : Lavc56.13.100 libx264
    Stream #0:1: Audio: vorbis (libvorbis) ([221][0][0][0] / 0x00DD), 48000 Hz, mono, fltp, 128 kb/s
    Metadata:
      encoder         : Lavc56.13.100 libvorbis
Stream mapping:
  Stream #0:0 -> #0:0 (rawvideo (native) -> h264 (libx264))
  Stream #1:0 -> #0:1 (pcm_s16le (native) -> vorbis (libvorbis))
[alsa @ 0x1a948a0] ALSA buffer xrun.  0kB time=00:00:00.00 bitrate=N/A    
[alsa @ 0x1a948a0] ALSA buffer xrun. 402kB time=00:00:04.37 bitrate= 752.3kbits/s    
[alsa @ 0x1a948a0] ALSA buffer xrun.4122kB time=00:00:08.80 bitrate=3833.0kbits/s    
[alsa @ 0x1a948a0] ALSA buffer xrun.8722kB time=00:00:13.14 bitrate=5436.3kbits/s    
[alsa @ 0x1a948a0] ALSA buffer xrun.3903kB time=00:00:17.51 bitrate=6502.2kbits/s    
[alsa @ 0x1a948a0] ALSA buffer xrun.6625kB time=00:00:21.89 bitrate=6221.4kbits/s    
[alsa @ 0x1a948a0] ALSA buffer xrun.9548kB time=00:00:26.28 bitrate=6092.5kbits/s    
^Cframe=  851 fps= 26 q=-1.0 Lsize=   22018kB time=00:00:30.69 bitrate=5875.3kbits/s    
video:21996kB audio:12kB subtitle:0kB other streams:0kB global headers:4kB muxing overhead: 0.044897%
[libx264 @ 0x1aa8ac0] frame I:4     Avg QP:23.50  size: 62405
[libx264 @ 0x1aa8ac0] frame P:847   Avg QP:25.58  size: 26297
[libx264 @ 0x1aa8ac0] mb I  I16..4: 100.0%  0.0%  0.0%
[libx264 @ 0x1aa8ac0] mb P  I16..4: 13.2%  0.0%  0.0%  P16..4: 72.0%  0.0%  0.0%  0.0%  0.0%    skip:14.8%
[libx264 @ 0x1aa8ac0] coded y,uvDC,uvAC intra: 40.6% 81.0% 58.6% inter: 58.8% 72.7% 8.6%
[libx264 @ 0x1aa8ac0] i16 v,h,dc,p: 41% 28% 22%  9%
[libx264 @ 0x1aa8ac0] i8c dc,h,v,p: 54% 19% 16% 11%
[libx264 @ 0x1aa8ac0] kb/s:6345.60
Received signal 2: terminating.


  



  ---

  



  ffmpeg's detection of the ALSA stream is seemingly goofed up by the inconsistencies of the tape. In the failure case, only short blips of the tapes audio exist in the output MP4. The audio bitrate of the output file is less than 10 kbps, averaged out across the whole file. The output video seems to be fine, even though the low frames-per-second in the failure case log below.

  



  The audio and video streams can be captured fine for short amounts of time before a source error occurs ; this provides the success case log. The failure case log was created by intentionally making an error in the source streams — turning on the camera makes a brief noisy signal.

  



  Is there a setting that needs to be forced to keep ffmpeg recording the audio stream, even when the tape is blank or noisy ?

  



  Could it be that the libfdk_aac audio encoder is tripped up by the low quality source ?

  



  The relevant line ; rawvideo stream is piped to this in script at bottom :

  



  ffmpeg -pixel_format uyvy422 -s:v 720x480 -framerate 29.97 -f rawvideo \
-i $PIPE  -f alsa -i hw:0,0 -vf scale=w=720:h=540 -vcodec libx264 \
-preset ultrafast -shortest -c:a libfdk_aac -b:a 128k -af pan=1:c0=c0  \
-ar 96000 $OUTFILE


  



  The ar argument was one attempt to force recording.

  



  ffmpeg log file for (short-lived) success ; high frames-per-second captured :

  



  ffmpeg version 2.5.3 Copyright (c) 2000-2015 the FFmpeg developers
  built on Jan 11 2015 17:53:45 with gcc 4.8 (Ubuntu 4.8.2-19ubuntu1)
  configuration: --extra-libs=-ldl --prefix=/opt/ffmpeg --enable-avresample --disable-debug --enable-nonfree --enable-gpl --enable-version3 --enable-libpulse --enable-libopencore-amrnb --enable-libopencore-amrwb --disable-decoder=amrnb --disable-decoder=amrwb --enable-libx264 --enable-libx265 --enable-libfdk-aac --enable-libvorbis --enable-libmp3lame --enable-libopus --enable-libvpx --enable-libspeex --enable-libass --enable-avisynth --enable-libsoxr --enable-libxvid --enable-libvo-aacenc --enable-libvidstab
  libavutil      54. 15.100 / 54. 15.100
  libavcodec     56. 13.100 / 56. 13.100
  libavformat    56. 15.102 / 56. 15.102
  libavdevice    56.  3.100 / 56.  3.100
  libavfilter     5.  2.103 /  5.  2.103
  libavresample   2.  1.  0 /  2.  1.  0
  libswscale      3.  1.101 /  3.  1.101
  libswresample   1.  1.100 /  1.  1.100
  libpostproc    53.  3.100 / 53.  3.100
Input #0, rawvideo, from '/tmp/somagic-pipe':
  Duration: N/A, start: 0.000000, bitrate: 165722 kb/s
    Stream #0:0: Video: rawvideo (UYVY / 0x59565955), uyvy422, 720x480, 165722 kb/s, 29.97 tbr, 29.97 tbn, 29.97 tbc
Home directory not accessible: Permission denied
Guessed Channel Layout for  Input Stream #1.0 : stereo
Input #1, alsa, from 'hw:0,0':
  Duration: N/A, start: 1423202268.577088, bitrate: 1536 kb/s
    Stream #1:0: Audio: pcm_s16le, 48000 Hz, 2 channels, s16, 1536 kb/s
No pixel format specified, yuv422p for H.264 encoding chosen.
Use -pix_fmt yuv420p for compatibility with outdated media players.
[Parsed_pan_0 @ 0x3335d60] This syntax is deprecated. Use '|' to separate the list items.
Single channel layout '1' is interpreted as a number of channels, switch to the syntax '1c' otherwise it will be interpreted as a channel layout number in a later version
[Parsed_pan_0 @ 0x3335d60] Pure channel mapping detected: 0
[libx264 @ 0x3364bc0] using cpu capabilities: MMX2 SSE2Fast SSSE3 SSE4.1 Cache64
[libx264 @ 0x3364bc0] profile High 4:2:2, level 3.1, 4:2:2 8-bit
[libx264 @ 0x3364bc0] 264 - core 142 r2389 956c8d8 - H.264/MPEG-4 AVC codec - Copyleft 2003-2014 - http://www.videolan.org/x264.html - options: cabac=0 ref=1 deblock=0:0:0 analyse=0:0 me=dia subme=0 psy=1 psy_rd=1.00:0.00 mixed_ref=0 me_range=16 chroma_me=1 trellis=0 8x8dct=0 cqm=0 deadzone=21,11 fast_pskip=1 chroma_qp_offset=0 threads=3 lookahead_threads=1 sliced_threads=0 nr=0 decimate=1 interlaced=0 bluray_compat=0 constrained_intra=0 bframes=0 weightp=0 keyint=250 keyint_min=25 scenecut=0 intra_refresh=0 rc=crf mbtree=0 crf=23.0 qcomp=0.60 qpmin=0 qpmax=69 qpstep=4 ip_ratio=1.40 aq=0
Output #0, mp4, to '/home/peterbecich/easycap/Videos/fpv_video_02_05_2015_21_57_48.mp4':
  Metadata:
    encoder         : Lavf56.15.102
    Stream #0:0: Video: h264 (libx264) ([33][0][0][0] / 0x0021), yuv422p, 720x540, q=-1--1, 29.97 fps, 11988 tbn, 29.97 tbc
    Metadata:
      encoder         : Lavc56.13.100 libx264
    Stream #0:1: Audio: aac (libfdk_aac) ([64][0][0][0] / 0x0040), 96000 Hz, mono, s16, 128 kb/s
    Metadata:
      encoder         : Lavc56.13.100 libfdk_aac
Stream mapping:
  Stream #0:0 -> #0:0 (rawvideo (native) -> h264 (libx264))
  Stream #1:0 -> #0:1 (pcm_s16le (native) -> aac (libfdk_aac))
Press [q] to stop, [?] for help
frame=   13 fps=0.0 q=26.0 size=     187kB time=00:00:00.30 bitrate=5102.7kbits/s    
frame=   29 fps= 29 q=26.0 size=     469kB time=00:00:00.83 bitrate=4607.6kbits/s    
frame=   44 fps= 29 q=26.0 size=     755kB time=00:00:01.33 bitrate=4635.2kbits/s    
frame=   59 fps= 29 q=26.0 size=    1024kB time=00:00:01.83 bitrate=4572.1kbits/s    
frame=   74 fps= 29 q=26.0 size=    1279kB time=00:00:02.33 bitrate=4486.5kbits/s    
frame=   89 fps= 29 q=26.0 size=    1516kB time=00:00:02.83 bitrate=4378.0kbits/s    
frame=  104 fps= 29 q=26.0 size=    1752kB time=00:00:03.33 bitrate=4301.0kbits/s    
frame=  119 fps= 29 q=26.0 size=    1991kB time=00:00:03.83 bitrate=4251.1kbits/s    
frame=  135 fps= 30 q=26.0 size=    2245kB time=00:00:04.37 bitrate=4207.5kbits/s    
frame=  150 fps= 30 q=26.0 size=    2524kB time=00:00:04.87 bitrate=4245.0kbits/s    
frame=  165 fps= 30 q=26.0 size=    2808kB time=00:00:05.37 bitrate=4282.0kbits/s    
frame=  180 fps= 30 q=26.0 size=    3091kB time=00:00:05.87 bitrate=4311.5kbits/s    
[rawvideo @ 0x3350640] Invalid buffer size, packet size 65536 < expected frame_size 691200
Error while decoding stream #0:0: Invalid argument
frame=  183 fps= 29 q=-1.0 Lsize=    3247kB time=00:00:06.11 bitrate=4351.5kbits/s    
video:3142kB audio:96kB subtitle:0kB other streams:0kB global headers:0kB muxing overhead: 0.254788%
[libx264 @ 0x3364bc0] frame I:1     Avg QP:20.00  size:  2289
[libx264 @ 0x3364bc0] frame P:182   Avg QP:25.99  size: 17664
[libx264 @ 0x3364bc0] mb I  I16..4: 100.0%  0.0%  0.0%
[libx264 @ 0x3364bc0] mb P  I16..4: 78.5%  0.0%  0.0%  P16..4: 20.2%  0.0%  0.0%  0.0%  0.0%    skip: 1.4%
[libx264 @ 0x3364bc0] coded y,uvDC,uvAC intra: 84.1% 71.5% 18.9% inter: 51.9% 63.5% 0.4%
[libx264 @ 0x3364bc0] i16 v,h,dc,p: 15%  8% 69%  8%
[libx264 @ 0x3364bc0] i8c dc,h,v,p: 50% 19% 24%  7%
[libx264 @ 0x3364bc0] kb/s:4215.02


  



  ffmpeg log for failure ; low FPS captured :

  



  ffmpeg version 2.5.3 Copyright (c) 2000-2015 the FFmpeg developers
  built on Jan 11 2015 17:53:45 with gcc 4.8 (Ubuntu 4.8.2-19ubuntu1)
  configuration: --extra-libs=-ldl --prefix=/opt/ffmpeg --enable-avresample --disable-debug --enable-nonfree --enable-gpl --enable-version3 --enable-libpulse --enable-libopencore-amrnb --enable-libopencore-amrwb --disable-decoder=amrnb --disable-decoder=amrwb --enable-libx264 --enable-libx265 --enable-libfdk-aac --enable-libvorbis --enable-libmp3lame --enable-libopus --enable-libvpx --enable-libspeex --enable-libass --enable-avisynth --enable-libsoxr --enable-libxvid --enable-libvo-aacenc --enable-libvidstab
  libavutil      54. 15.100 / 54. 15.100
  libavcodec     56. 13.100 / 56. 13.100
  libavformat    56. 15.102 / 56. 15.102
  libavdevice    56.  3.100 / 56.  3.100
  libavfilter     5.  2.103 /  5.  2.103
  libavresample   2.  1.  0 /  2.  1.  0
  libswscale      3.  1.101 /  3.  1.101
  libswresample   1.  1.100 /  1.  1.100
  libpostproc    53.  3.100 / 53.  3.100
Input #0, rawvideo, from '/tmp/somagic-pipe':
  Duration: N/A, start: 0.000000, bitrate: 165722 kb/s
    Stream #0:0: Video: rawvideo (UYVY / 0x59565955), uyvy422, 720x480, 165722 kb/s, 29.97 tbr, 29.97 tbn, 29.97 tbc
Home directory not accessible: Permission denied
Guessed Channel Layout for  Input Stream #1.0 : stereo
Input #1, alsa, from 'hw:0,0':
  Duration: N/A, start: 1423201999.226455, bitrate: 1536 kb/s
    Stream #1:0: Audio: pcm_s16le, 48000 Hz, 2 channels, s16, 1536 kb/s
No pixel format specified, yuv422p for H.264 encoding chosen.
Use -pix_fmt yuv420p for compatibility with outdated media players.
[Parsed_pan_0 @ 0x21cad60] This syntax is deprecated. Use '|' to separate the list items.
Single channel layout '1' is interpreted as a number of channels, switch to the syntax '1c' otherwise it will be interpreted as a channel layout number in a later version
[Parsed_pan_0 @ 0x21cad60] Pure channel mapping detected: 0
[libx264 @ 0x21f9bc0] using cpu capabilities: MMX2 SSE2Fast SSSE3 SSE4.1 Cache64
[libx264 @ 0x21f9bc0] profile High 4:2:2, level 3.1, 4:2:2 8-bit
[libx264 @ 0x21f9bc0] 264 - core 142 r2389 956c8d8 - H.264/MPEG-4 AVC codec - Copyleft 2003-2014 - http://www.videolan.org/x264.html - options: cabac=0 ref=1 deblock=0:0:0 analyse=0:0 me=dia subme=0 psy=1 psy_rd=1.00:0.00 mixed_ref=0 me_range=16 chroma_me=1 trellis=0 8x8dct=0 cqm=0 deadzone=21,11 fast_pskip=1 chroma_qp_offset=0 threads=3 lookahead_threads=1 sliced_threads=0 nr=0 decimate=1 interlaced=0 bluray_compat=0 constrained_intra=0 bframes=0 weightp=0 keyint=250 keyint_min=25 scenecut=0 intra_refresh=0 rc=crf mbtree=0 crf=23.0 qcomp=0.60 qpmin=0 qpmax=69 qpstep=4 ip_ratio=1.40 aq=0
Output #0, mp4, to '/home/peterbecich/easycap/Videos/fpv_video_02_05_2015_21_53_18.mp4':
  Metadata:
    encoder         : Lavf56.15.102
    Stream #0:0: Video: h264 (libx264) ([33][0][0][0] / 0x0021), yuv422p, 720x540, q=-1--1, 29.97 fps, 11988 tbn, 29.97 tbc
    Metadata:
      encoder         : Lavc56.13.100 libx264
    Stream #0:1: Audio: aac (libfdk_aac) ([64][0][0][0] / 0x0040), 96000 Hz, mono, s16, 128 kb/s
    Metadata:
      encoder         : Lavc56.13.100 libfdk_aac
Stream mapping:
  Stream #0:0 -> #0:0 (rawvideo (native) -> h264 (libx264))
  Stream #1:0 -> #0:1 (pcm_s16le (native) -> aac (libfdk_aac))
Press [q] to stop, [?] for help
frame=    1 fps=0.0 q=0.0 size=       0kB time=00:00:00.00 bitrate=N/A    
frame=    1 fps=1.0 q=0.0 size=       0kB time=00:00:00.00 bitrate=N/A    
frame=    1 fps=0.7 q=0.0 size=       0kB time=00:00:00.00 bitrate=N/A    
frame=    1 fps=0.5 q=0.0 size=       0kB time=00:00:00.00 bitrate=N/A    
frame=    1 fps=0.4 q=0.0 size=       0kB time=00:00:00.00 bitrate=N/A    
frame=    1 fps=0.3 q=0.0 size=       0kB time=00:00:00.00 bitrate=N/A    
frame=    1 fps=0.3 q=0.0 size=       0kB time=00:00:00.00 bitrate=N/A    
frame=    1 fps=0.2 q=0.0 size=       0kB time=00:00:00.00 bitrate=N/A    
frame=    1 fps=0.2 q=0.0 size=       0kB time=00:00:00.00 bitrate=N/A    
frame=    1 fps=0.2 q=0.0 size=       0kB time=00:00:00.00 bitrate=N/A    
frame=    1 fps=0.2 q=0.0 size=       0kB time=00:00:00.00 bitrate=N/A    
[alsa @ 0x21e5ac0] ALSA buffer xrun.
frame=    8 fps=1.3 q=19.0 size=      12kB time=00:00:06.03 bitrate=  15.9kbits/s    
frame=   23 fps=3.5 q=18.0 size=      12kB time=00:00:06.03 bitrate=  16.4kbits/s    
frame=   38 fps=5.4 q=18.0 size=      12kB time=00:00:06.03 bitrate=  16.7kbits/s    
frame=   53 fps=7.0 q=18.0 size=      12kB time=00:00:06.03 bitrate=  16.9kbits/s    
frame=   68 fps=8.4 q=26.0 size=     146kB time=00:00:06.03 bitrate= 198.8kbits/s    
frame=   83 fps=9.7 q=26.0 size=     375kB time=00:00:06.03 bitrate= 510.0kbits/s    
frame=   98 fps= 11 q=26.0 size=     608kB time=00:00:06.03 bitrate= 826.5kbits/s    
frame=  114 fps= 12 q=26.0 size=     875kB time=00:00:06.03 bitrate=1189.1kbits/s    
frame=  128 fps= 13 q=26.0 size=    1091kB time=00:00:06.03 bitrate=1481.6kbits/s    
frame=  144 fps= 14 q=26.0 size=    1339kB time=00:00:06.03 bitrate=1819.2kbits/s    
frame=  159 fps= 14 q=26.0 size=    1571kB time=00:00:06.03 bitrate=2134.6kbits/s    
frame=  174 fps= 15 q=26.0 size=    1796kB time=00:00:06.03 bitrate=2440.1kbits/s    
[alsa @ 0x21e5ac0] ALSA buffer xrun.
frame=  189 fps= 16 q=26.0 size=    2015kB time=00:00:12.04 bitrate=1370.4kbits/s    
frame=  204 fps= 16 q=26.0 size=    2238kB time=00:00:12.04 bitrate=1522.3kbits/s    
frame=  219 fps= 17 q=26.0 size=    2490kB time=00:00:12.04 bitrate=1694.2kbits/s    
frame=  235 fps= 17 q=26.0 size=    2728kB time=00:00:12.04 bitrate=1855.8kbits/s    
frame=  250 fps= 18 q=26.0 size=    2973kB time=00:00:12.04 bitrate=2022.4kbits/s    
[rawvideo @ 0x21e5640] Invalid buffer size, packet size 65536 < expected frame_size 691200
Error while decoding stream #0:0: Invalid argument
frame=  261 fps= 18 q=-1.0 Lsize=    3269kB time=00:00:12.06 bitrate=2220.1kbits/s    
video:3263kB audio:4kB subtitle:0kB other streams:0kB global headers:0kB muxing overhead: 0.081101%
[libx264 @ 0x21f9bc0] frame I:2     Avg QP:21.50  size: 21342
[libx264 @ 0x21f9bc0] frame P:259   Avg QP:24.22  size: 12734
[libx264 @ 0x21f9bc0] mb I  I16..4: 100.0%  0.0%  0.0%
[libx264 @ 0x21f9bc0] mb P  I16..4: 62.8%  0.0%  0.0%  P16..4: 14.2%  0.0%  0.0%  0.0%  0.0%    skip:22.9%
[libx264 @ 0x21f9bc0] coded y,uvDC,uvAC intra: 77.7% 61.2% 14.1% inter: 19.7% 24.8% 1.6%
[libx264 @ 0x21f9bc0] i16 v,h,dc,p: 17% 10% 65%  8%
[libx264 @ 0x21f9bc0] i8c dc,h,v,p: 52% 18% 24%  6%
[libx264 @ 0x21f9bc0] kb/s:3068.90


  



  The whole script :

  



  #!/bin/sh

PIPE=/tmp/somagic-pipe
OUTFILEDIR=~/easycap/Videos/
LOGDIR=~/.somagic-log/
NOW=`date +"%m_%d_%Y_%H_%M_%S"`

OUTFILE=${OUTFILEDIR}fpv_video_${NOW}.mp4

mkdir $LOGDIR

FFMPEG_LOG=${LOGDIR}ffmpeg.log
SOMAGIC_LOG=${LOGDIR}somagic.log
MPLAYER_LOG=${LOGDIR}mplayer.log

rm $PIPE >/dev/null 2>&1
rm $OUTFILE >/dev/null 2>&1

rm $FFMPEG_LOG
rm $SOMAGIC_LOG
rm $MPLAYER_LOG

mkfifo $PIPE >/dev/null 2>&1

ffmpeg -pixel_format uyvy422 -s:v 720x480 -framerate 29.97 -f rawvideo \
-i $PIPE  -f alsa -i hw:0,0 -vf scale=w=720:h=540 -vcodec libx264 \
-preset ultrafast -shortest -c:a libfdk_aac -b:a 128k -af pan=1:c0=c0  \
-ar 96000 $OUTFILE > $FFMPEG_LOG 2>&1 &

somagic-capture --ntsc -c --luminance=2 --lum-aperture=3 2> $SOMAGIC_LOG \
| tee $PIPE | \
mplayer -vf yadif,screenshot -demuxer rawvideo -rawvideo \
"ntsc:format=uyvy:fps=30000/1001" -aspect 4:3 - 2> $MPLAYER_LOG


rm $PIPE >/dev/null 2>&1 


  



  Modified from here : https://gist.github.com/Brick85/0b327ac2d3d45e23ed33

  


• FFMPEG changes speed when concat 2 or more different videos

  13 novembre 2020, par Daniel Santos Neto

  I am using this code

  


  ffmpeg   -y  -re -i "/myvideos/countdown10.mp4"   -re -i "/myvideos/video_218.mp4"  -re -i "/myvideos/video_220.mp4"   -re -i "/myvideos/video_221.mp4"  -re -i "/myvideos/video_222.mp4"   -re -i "/myvideos/countdown10.mp4"  -re -i '/myvideos/watermark.png'  -filter_complex " [0:v] [0:a]   [1:v] [1:a]   [2:v] [2:a]   [3:v] [3:a]   [4:v] [4:a]   [5:v] [5:a]  concat=n=6:v=1:a=1:unsafe=1 [vv] [a]; [vv][6:v]overlay=W-w-0:0[v]" -map "[v]" -map "[a]"  -preset veryfast -vcodec h264 -acodec aac -strict -2 -max_muxing_queue_size 1024 -y -s 1280x720  -ar 44100 -f flv rtmp://server/live/5fa3731d4f8a6_159


  


  the problem is, when I run it the process speed is a lot faster then the videos length, so I got disconnected from my livestream before the live finishes.

  


  I guess it is something related to the bit rates.

  


  also I notice depends on what video is transcoding the speed floats between 0.9x and 3.7x

  


  frame= 4481 fps= 76 q=-1.0 Lsize= 16857kB time=00:03:13.21 bitrate= 714.7kbits/s dup=0 drop=393 speed=3.29x

  


  Edited :

  


  Complete log file :

  


  avideo@ubuntu:~$ ffmpeg    -re -i "/var/www/gdrive/htdocs/YouPHPTube-Encoder/videos/videosListToLive/countdown10.mp4"   -re -i "/var/www/gdrive/htdocs/YouPHPTube-Encoder/videos/videosListToLive/192.168.1.4/video_222.mp4" -filter_complex " [0:v] [0:a]   [1:v] [1:a] concat=n=2:v=1:a=1:unsafe=1 [v] [a]" -map "[v]" -map "[a]"   -preset veryfast  -vcodec h264 -acodec aac -strict -2 -max_muxing_queue_size 1024 -y -s 1280x720 -ar 44100  -f flv rtmp://encoder.gdrive.local/live?p=f321d14cdeeb7cded7489f504fa8862b/5fa3731d4f8a6_160
ffmpeg version 4.2.4-1ubuntu0.1 Copyright (c) 2000-2020 the FFmpeg developers
  built with gcc 9 (Ubuntu 9.3.0-10ubuntu2)
  configuration: --prefix=/usr --extra-version=1ubuntu0.1 --toolchain=hardened --libdir=/usr/lib/x86_64-linux-gnu --incdir=/usr/include/x86_64-linux-gnu --arch=amd64 --enable-gpl --disable-stripping --enable-avresample --disable-filter=resample --enable-avisynth --enable-gnutls --enable-ladspa --enable-libaom --enable-libass --enable-libbluray --enable-libbs2b --enable-libcaca --enable-libcdio --enable-libcodec2 --enable-libflite --enable-libfontconfig --enable-libfreetype --enable-libfribidi --enable-libgme --enable-libgsm --enable-libjack --enable-libmp3lame --enable-libmysofa --enable-libopenjpeg --enable-libopenmpt --enable-libopus --enable-libpulse --enable-librsvg --enable-librubberband --enable-libshine --enable-libsnappy --enable-libsoxr --enable-libspeex --enable-libssh --enable-libtheora --enable-libtwolame --enable-libvidstab --enable-libvorbis --enable-libvpx --enable-libwavpack --enable-libwebp --enable-libx265 --enable-libxml2 --enable-libxvid --enable-libzmq --enable-libzvbi --enable-lv2 --enable-omx --enable-openal --enable-opencl --enable-opengl --enable-sdl2 --enable-libdc1394 --enable-libdrm --enable-libiec61883 --enable-nvenc --enable-chromaprint --enable-frei0r --enable-libx264 --enable-shared
  libavutil      56. 31.100 / 56. 31.100
  libavcodec     58. 54.100 / 58. 54.100
  libavformat    58. 29.100 / 58. 29.100
  libavdevice    58.  8.100 / 58.  8.100
  libavfilter     7. 57.100 /  7. 57.100
  libavresample   4.  0.  0 /  4.  0.  0
  libswscale      5.  5.100 /  5.  5.100
  libswresample   3.  5.100 /  3.  5.100
  libpostproc    55.  5.100 / 55.  5.100
Input #0, mov,mp4,m4a,3gp,3g2,mj2, from '/var/www/gdrive/htdocs/YouPHPTube-Encoder/videos/videosListToLive/countdown10.mp4':
  Metadata:
    major_brand     : isom
    minor_version   : 512
    compatible_brands: isomiso2avc1mp41
    encoder         : Lavf58.29.100
  Duration: 00:00:10.02, start: 0.000000, bitrate: 122 kb/s
    Stream #0:0(und): Video: h264 (High) (avc1 / 0x31637661), yuv420p, 1280x720 [SAR 1:1 DAR 16:9], 83 kb/s, 5 fps, 5 tbr, 10240 tbn, 10 tbc (default)
    Metadata:
      handler_name    : VideoHandler
    Stream #0:1(eng): Audio: aac (LC) (mp4a / 0x6134706D), 44100 Hz, stereo, fltp, 35 kb/s (default)
    Metadata:
      handler_name    : IsoMedia File Produced by Google, 5-11-2011
Input #1, mov,mp4,m4a,3gp,3g2,mj2, from '/var/www/gdrive/htdocs/YouPHPTube-Encoder/videos/videosListToLive/192.168.1.4/video_222.mp4':
  Metadata:
    major_brand     : isom
    minor_version   : 512
    compatible_brands: isomiso2avc1mp41
    encoder         : Lavf58.29.100
  Duration: 00:00:30.60, start: 0.000000, bitrate: 37 kb/s
    Stream #1:0(und): Video: h264 (High) (avc1 / 0x31637661), yuv420p, 1280x720 [SAR 1:1 DAR 16:9], 26 kb/s, 30 fps, 30 tbr, 15360 tbn, 60 tbc (default)
    Metadata:
      handler_name    : ISO Media file produced by Google Inc. Created on: 10/16/2018.
    Stream #1:1(und): Audio: aac (LC) (mp4a / 0x6134706D), 44100 Hz, stereo, fltp, 2 kb/s (default)
    Metadata:
      handler_name    : ISO Media file produced by Google Inc. Created on: 10/16/2018.
Stream mapping:
  Stream #0:0 (h264) -> concat:in0:v0
  Stream #0:1 (aac) -> concat:in0:a0
  Stream #1:0 (h264) -> concat:in1:v0
  Stream #1:1 (aac) -> concat:in1:a0
  concat:out:v0 -> Stream #0:0 (libx264)
  concat:out:a0 -> Stream #0:1 (aac)
Press [q] to stop, [?] for help
[libx264 @ 0x5645453b7a80] using SAR=1/1B time=-577014:32:22.77 bitrate=  -0.0kbits/s speed=N/A
[libx264 @ 0x5645453b7a80] using cpu capabilities: MMX2 SSE2Fast SSSE3 SSE4.2 AVX FMA3 BMI2 AVX2
[libx264 @ 0x5645453b7a80] profile High, level 3.1
[libx264 @ 0x5645453b7a80] 264 - core 155 r2917 0a84d98 - H.264/MPEG-4 AVC codec - Copyleft 2003-2018 - http://www.videolan.org/x264.html - options: cabac=1 ref=1 deblock=1:0:0 analyse=0x3:0x113 me=hex subme=2 psy=1 psy_rd=1.00:0.00 mixed_ref=0 me_range=16 chroma_me=1 trellis=0 8x8dct=1 cqm=0 deadzone=21,11 fast_pskip=1 chroma_qp_offset=0 threads=6 lookahead_threads=2 sliced_threads=0 nr=0 decimate=1 interlaced=0 bluray_compat=0 constrained_intra=0 bframes=3 b_pyramid=2 b_adapt=1 b_bias=0 direct=1 weightb=1 open_gop=0 weightp=1 keyint=250 keyint_min=5 scenecut=40 intra_refresh=0 rc_lookahead=10 rc=crf mbtree=1 crf=23.0 qcomp=0.60 qpmin=0 qpmax=69 qpstep=4 ip_ratio=1.40 aq=1:1.00
Output #0, flv, to 'rtmp://encoder.gdrive.local/live?p=f321d14cdeeb7cded7489f504fa8862b/5fa3731d4f8a6_160':
  Metadata:
    major_brand     : isom
    minor_version   : 512
    compatible_brands: isomiso2avc1mp41
    encoder         : Lavf58.29.100
    Stream #0:0: Video: h264 (libx264) ([7][0][0][0] / 0x0007), yuv420p(progressive), 1280x720 [SAR 1:1 DAR 16:9], q=-1--1, 5 fps, 1k tbn, 5 tbc (default)
    Metadata:
      encoder         : Lavc58.54.100 libx264
    Side data:
      cpb: bitrate max/min/avg: 0/0/0 buffer size: 0 vbv_delay: -1
    Stream #0:1: Audio: aac (LC) ([10][0][0][0] / 0x000A), 44100 Hz, stereo, fltp, 128 kb/s (default)
    Metadata:
      encoder         : Lavc58.54.100 aac
[flv @ 0x5645453ae580] Failed to update header with correct duration. 49.3kbits/s dup=0 drop=751 speed=1.33x
[flv @ 0x5645453ae580] Failed to update header with correct filesize.
frame=  205 fps=6.7 q=-1.0 Lsize=     250kB time=00:00:40.58 bitrate=  50.5kbits/s dup=0 drop=762 speed=1.33x
video:164kB audio:53kB subtitle:0kB other streams:0kB global headers:0kB muxing overhead: 15.473391%
[libx264 @ 0x5645453b7a80] frame I:2     Avg QP: 4.62  size: 10450
[libx264 @ 0x5645453b7a80] frame P:58    Avg QP:10.06  size:  1457
[libx264 @ 0x5645453b7a80] frame B:145   Avg QP:11.12  size:   427
[libx264 @ 0x5645453b7a80] consecutive B-frames:  4.9%  1.0%  4.4% 89.8%
[libx264 @ 0x5645453b7a80] mb I  I16..4: 91.4%  2.8%  5.7%
[libx264 @ 0x5645453b7a80] mb P  I16..4:  8.4%  0.4%  0.1%  P16..4:  2.0%  0.3%  0.1%  0.0%  0.0%    skip:88.6%
[libx264 @ 0x5645453b7a80] mb B  I16..4:  0.2%  0.1%  0.0%  B16..8:  0.9%  0.1%  0.0%  direct: 4.7%  skip:94.0%  L0:33.9% L1:63.4% BI: 2.7%
[libx264 @ 0x5645453b7a80] 8x8 transform intra:5.5% inter:24.0%
[libx264 @ 0x5645453b7a80] coded y,uvDC,uvAC intra: 4.7% 22.9% 19.5% inter: 0.2% 4.2% 0.3%
[libx264 @ 0x5645453b7a80] i16 v,h,dc,p: 94%  4%  2%  0%
[libx264 @ 0x5645453b7a80] i8 v,h,dc,ddl,ddr,vr,hd,vl,hu: 31% 18% 37%  3%  2%  3%  2%  2%  1%
[libx264 @ 0x5645453b7a80] i4 v,h,dc,ddl,ddr,vr,hd,vl,hu: 38% 20% 21%  5%  3%  4%  3%  4%  3%
[libx264 @ 0x5645453b7a80] i8c dc,h,v,p: 78%  8% 12%  2%
[libx264 @ 0x5645453b7a80] Weighted P-Frames: Y:20.7% UV:20.7%
[libx264 @ 0x5645453b7a80] kb/s:32.64
[aac @ 0x564545421540] Qavg: 61548.156
avideo@ubuntu:~$


  


  Also here is a video where you can see the process

  


  https://tutorials.avideo.com/video/102/ffmpeg-changes-speed-when-concat-2-or-more-different-videos

  


  this live should have exactly 40 seconds but finishes before then that

  


  also look at this time position https://tutorials.avideo.com/video/102/ffmpeg-changes-speed-when-concat-2-or-more-different-videos?t=12

  


  the speed changes from speed=0.9 to speed=1.9

  


  speed=0.9 to speed=1.9

  


  EDITED 2 :

  


  I tried the FPS command as suggested and still the problem

  


  avideo@ubuntu:~$ ffmpeg    -re -i "http://192.168.1.4/YouPHPTube/videos/_YPTuniqid_5f80c547421057.24056015/index.m3u8?token=eyJzYWx0IjoiaHR0cDpcL1wvMTkyLjE2OC4xLjRcL1lvdVBIUFR1YmVcLyIsInRva2VuVGltZU91dCI6IjIxNjAwIiwiZmlsZW5hbWUiOiJfWVBUdW5pcWlkXzVmODBjNTQ3NDIxMDU3LjI0MDU2MDE1IiwidGltZSI6MTYwNTI4MzExN30="   -re -i "http://192.168.1.4/YouPHPTube/videos/_YPTuniqid_5fa3f4e37ffb65.33430678_720.mp4?token=eyJzYWx0IjoiaHR0cDpcL1wvMTkyLjE2OC4xLjRcL1lvdVBIUFR1YmVcLyIsInRva2VuVGltZU91dCI6IjIxNjAwIiwiZmlsZW5hbWUiOiJfWVBUdW5pcWlkXzVmYTNmNGUzN2ZmYjY1LjMzNDMwNjc4IiwidGltZSI6MTYwNTI4MzExN30="   -re -i '/var/www/gdrive/htdocs/YouPHPTube-Encoder/videos/videosListToLive/192.168.1.4/watermark.png'  -filter_complex "  [0]setdar=16/9,scale=1280:720, fps=30[0:v];     [1]setdar=16/9,scale=1280:720, fps=30[1:v];     [0:v] [0:a]     [1:v] [1:a]   concat=n=2:v=1:a=1:unsafe=1 [vv] [a]; [vv][2:v]overlay=W-w-0:0[v]" -map "[v]" -map "[a]"   -c:v libx264 -b:v 3000k -maxrate 3000k -bufsize 6000k -g 50 -c:a aac -b:a 128k -ac 2 -s 1280x720  -ar 44100   -f flv rtmp://encoder.gdrive.local/live?p=f321d14cdeeb7cded7489f504fa8862b/5fa3731d4f8a6_161
ffmpeg version 4.2.4-1ubuntu0.1 Copyright (c) 2000-2020 the FFmpeg developers
  built with gcc 9 (Ubuntu 9.3.0-10ubuntu2)
  configuration: --prefix=/usr --extra-version=1ubuntu0.1 --toolchain=hardened --libdir=/usr/lib/x86_64-linux-gnu --incdir=/usr/include/x86_64-linux-gnu --arch=amd64 --enable-gpl --disable-stripping --enable-avresample --disable-filter=resample --enable-avisynth --enable-gnutls --enable-ladspa --enable-libaom --enable-libass --enable-libbluray --enable-libbs2b --enable-libcaca --enable-libcdio --enable-libcodec2 --enable-libflite --enable-libfontconfig --enable-libfreetype --enable-libfribidi --enable-libgme --enable-libgsm --enable-libjack --enable-libmp3lame --enable-libmysofa --enable-libopenjpeg --enable-libopenmpt --enable-libopus --enable-libpulse --enable-librsvg --enable-librubberband --enable-libshine --enable-libsnappy --enable-libsoxr --enable-libspeex --enable-libssh --enable-libtheora --enable-libtwolame --enable-libvidstab --enable-libvorbis --enable-libvpx --enable-libwavpack --enable-libwebp --enable-libx265 --enable-libxml2 --enable-libxvid --enable-libzmq --enable-libzvbi --enable-lv2 --enable-omx --enable-openal --enable-opencl --enable-opengl --enable-sdl2 --enable-libdc1394 --enable-libdrm --enable-libiec61883 --enable-nvenc --enable-chromaprint --enable-frei0r --enable-libx264 --enable-shared
  libavutil      56. 31.100 / 56. 31.100
  libavcodec     58. 54.100 / 58. 54.100
  libavformat    58. 29.100 / 58. 29.100
  libavdevice    58.  8.100 / 58.  8.100
  libavfilter     7. 57.100 /  7. 57.100
  libavresample   4.  0.  0 /  4.  0.  0
  libswscale      5.  5.100 /  5.  5.100
  libswresample   3.  5.100 /  3.  5.100
  libpostproc    55.  5.100 / 55.  5.100
[hls @ 0x5627c50f2800] Skip ('#EXT-X-VERSION:3')
[hls @ 0x5627c50f2800] Opening 'http://192.168.1.4/YouPHPTube/videos/_YPTuniqid_5f80c547421057.24056015/res240/index.m3u8?token=eyJzYWx0IjoiaHR0cDpcL1wvMTkyLjE2OC4xLjRcL1lvdVBIUFR1YmVcLyIsInRva2VuVGltZU91dCI6IjIxNjAwIiwiZmlsZW5hbWUiOiJfWVBUdW5pcWlkXzVmODBjNTQ3NDIxMDU3LjI0MDU2MDE1IiwidGltZSI6MTYwNTI4MzExN30=' for reading
[hls @ 0x5627c50f2800] Skip ('#EXT-X-VERSION:3')
[http @ 0x5627c50fa940] Opening 'http://192.168.1.4/YouPHPTube/videos/_YPTuniqid_5f80c547421057.24056015/res360/index.m3u8?token=eyJzYWx0IjoiaHR0cDpcL1wvMTkyLjE2OC4xLjRcL1lvdVBIUFR1YmVcLyIsInRva2VuVGltZU91dCI6IjIxNjAwIiwiZmlsZW5hbWUiOiJfWVBUdW5pcWlkXzVmODBjNTQ3NDIxMDU3LjI0MDU2MDE1IiwidGltZSI6MTYwNTI4MzExN30=' for reading
[hls @ 0x5627c50f2800] Skip ('#EXT-X-VERSION:3')
[hls @ 0x5627c50f2800] Opening 'http://192.168.1.4/YouPHPTube/videos/_YPTuniqid_5f80c547421057.24056015/enc_5f80c54914f03.key' for reading
[hls @ 0x5627c50f2800] Opening 'crypto+http://192.168.1.4/YouPHPTube/videos/_YPTuniqid_5f80c547421057.24056015/res240/index0.ts' for reading
[hls @ 0x5627c50f2800] Opening 'http://192.168.1.4/YouPHPTube/videos/_YPTuniqid_5f80c547421057.24056015/enc_5f80c54914f03.key' for reading
[hls @ 0x5627c50f2800] Opening 'crypto+http://192.168.1.4/YouPHPTube/videos/_YPTuniqid_5f80c547421057.24056015/res360/index0.ts' for reading
Input #0, hls, from 'http://192.168.1.4/YouPHPTube/videos/_YPTuniqid_5f80c547421057.24056015/index.m3u8?token=eyJzYWx0IjoiaHR0cDpcL1wvMTkyLjE2OC4xLjRcL1lvdVBIUFR1YmVcLyIsInRva2VuVGltZU91dCI6IjIxNjAwIiwiZmlsZW5hbWUiOiJfWVBUdW5pcWlkXzVmODBjNTQ3NDIxMDU3LjI0MDU2MDE1IiwidGltZSI6MTYwNTI4MzExN30=':
  Duration: 00:00:13.21, start: 1.460111, bitrate: 0 kb/s
  Program 0
    Metadata:
      variant_bitrate : 300000
    Stream #0:0: Video: h264 (High) ([27][0][0][0] / 0x001B), yuv420p, 426x240 [SAR 640:639 DAR 16:9], 24 fps, 24 tbr, 90k tbn, 48 tbc
    Metadata:
      variant_bitrate : 300000
    Stream #0:1: Audio: aac (LC) ([15][0][0][0] / 0x000F), 44100 Hz, stereo, fltp
    Metadata:
      variant_bitrate : 300000
  Program 1
    Metadata:
      variant_bitrate : 600000
    Stream #0:2: Video: h264 (High) ([27][0][0][0] / 0x001B), yuv420p, 640x360 [SAR 1:1 DAR 16:9], 24 fps, 24 tbr, 90k tbn, 48 tbc
    Metadata:
      variant_bitrate : 600000
    Stream #0:3: Audio: aac (LC) ([15][0][0][0] / 0x000F), 44100 Hz, stereo, fltp
    Metadata:
      variant_bitrate : 600000
Input #1, mov,mp4,m4a,3gp,3g2,mj2, from 'http://192.168.1.4/YouPHPTube/videos/_YPTuniqid_5fa3f4e37ffb65.33430678_720.mp4?token=eyJzYWx0IjoiaHR0cDpcL1wvMTkyLjE2OC4xLjRcL1lvdVBIUFR1YmVcLyIsInRva2VuVGltZU91dCI6IjIxNjAwIiwiZmlsZW5hbWUiOiJfWVBUdW5pcWlkXzVmYTNmNGUzN2ZmYjY1LjMzNDMwNjc4IiwidGltZSI6MTYwNTI4MzExN30=':
  Metadata:
    major_brand     : isom
    minor_version   : 512
    compatible_brands: isomiso2avc1mp41
    encoder         : Lavf58.29.100
  Duration: 00:00:30.60, start: 0.000000, bitrate: 37 kb/s
    Stream #1:0(und): Video: h264 (High) (avc1 / 0x31637661), yuv420p, 1280x720 [SAR 1:1 DAR 16:9], 26 kb/s, 30 fps, 30 tbr, 15360 tbn, 60 tbc (default)
    Metadata:
      handler_name    : ISO Media file produced by Google Inc. Created on: 10/16/2018.
    Stream #1:1(und): Audio: aac (LC) (mp4a / 0x6134706D), 44100 Hz, stereo, fltp, 2 kb/s (default)
    Metadata:
      handler_name    : ISO Media file produced by Google Inc. Created on: 10/16/2018.
Input #2, png_pipe, from '/var/www/gdrive/htdocs/YouPHPTube-Encoder/videos/videosListToLive/192.168.1.4/watermark.png':
  Duration: N/A, bitrate: N/A
    Stream #2:0: Video: png, rgba(pc), 1280x720 [SAR 3780:3780 DAR 16:9], 25 tbr, 25 tbn, 25 tbc
Stream mapping:
  Stream #0:0 (h264) -> setdar
  Stream #0:1 (aac) -> concat:in0:a0
  Stream #1:0 (h264) -> setdar
  Stream #1:1 (aac) -> concat:in1:a0
  Stream #2:0 (png) -> overlay:overlay
  overlay -> Stream #0:0 (libx264)
  concat:out:a0 -> Stream #0:1 (aac)
Press [q] to stop, [?] for help
[libx264 @ 0x5627c5267f40] using SAR=1/1
[libx264 @ 0x5627c5267f40] using cpu capabilities: MMX2 SSE2Fast SSSE3 SSE4.2 AVX FMA3 BMI2 AVX2
[libx264 @ 0x5627c5267f40] profile High, level 3.1
[libx264 @ 0x5627c5267f40] 264 - core 155 r2917 0a84d98 - H.264/MPEG-4 AVC codec - Copyleft 2003-2018 - http://www.videolan.org/x264.html - options: cabac=1 ref=3 deblock=1:0:0 analyse=0x3:0x113 me=hex subme=7 psy=1 psy_rd=1.00:0.00 mixed_ref=1 me_range=16 chroma_me=1 trellis=1 8x8dct=1 cqm=0 deadzone=21,11 fast_pskip=1 chroma_qp_offset=-2 threads=6 lookahead_threads=1 sliced_threads=0 nr=0 decimate=1 interlaced=0 bluray_compat=0 constrained_intra=0 bframes=3 b_pyramid=2 b_adapt=1 b_bias=0 direct=1 weightb=1 open_gop=0 weightp=2 keyint=50 keyint_min=5 scenecut=40 intra_refresh=0 rc_lookahead=40 rc=cbr mbtree=1 bitrate=3000 ratetol=1.0 qcomp=0.60 qpmin=0 qpmax=69 qpstep=4 vbv_maxrate=3000 vbv_bufsize=6000 nal_hrd=none filler=0 ip_ratio=1.40 aq=1:1.00
Output #0, flv, to 'rtmp://encoder.gdrive.local/live?p=f321d14cdeeb7cded7489f504fa8862b/5fa3731d4f8a6_161':
  Metadata:
    encoder         : Lavf58.29.100
    Stream #0:0: Video: h264 (libx264) ([7][0][0][0] / 0x0007), yuv420p, 1280x720 [SAR 1:1 DAR 16:9], q=-1--1, 3000 kb/s, 30 fps, 1k tbn, 30 tbc (default)
    Metadata:
      encoder         : Lavc58.54.100 libx264
    Side data:
      cpb: bitrate max/min/avg: 3000000/0/3000000 buffer size: 6000000 vbv_delay: -1
    Stream #0:1: Audio: aac (LC) ([10][0][0][0] / 0x000A), 44100 Hz, stereo, fltp, 128 kb/s (default)
    Metadata:
      encoder         : Lavc58.54.100 aac
[hls @ 0x5627c50f2800] Opening 'crypto+http://192.168.1.4/YouPHPTube/videos/_YPTuniqid_5f80c547421057.24056015/res240/index1.ts' for reading
[hls @ 0x5627c50f2800] No longer receiving playlist 1 ('http://192.168.1.4/YouPHPTube/videos/_YPTuniqid_5f80c547421057.24056015/res360/index.m3u8?token=eyJzYWx0IjoiaHR0cDpcL1wvMTkyLjE2OC4xLjRcL1lvdVBIUFR1YmVcLyIsInRva2VuVGltZU91dCI6IjIxNjAwIiwiZmlsZW5hbWUiOiJfWVBUdW5pcWlkXzVmODBjNTQ3NDIxMDU3LjI0MDU2MDE1IiwidGltZSI6MTYwNTI4MzExN30=')
[hls @ 0x5627c50f2800] Opening 'crypto+http://192.168.1.4/YouPHPTube/videos/_YPTuniqid_5f80c547421057.24056015/res240/index2.ts' for reading
[flv @ 0x5627c52635c0] Failed to update header with correct duration.10.4kbits/s speed=1.43x
[flv @ 0x5627c52635c0] Failed to update header with correct filesize.
frame= 1313 fps= 43 q=-1.0 Lsize=    5937kB time=00:00:43.81 bitrate=1110.1kbits/s speed=1.43x
video:5662kB audio:218kB subtitle:0kB other streams:0kB global headers:0kB muxing overhead: 0.976283%
[libx264 @ 0x5627c5267f40] frame I:70    Avg QP: 4.15  size: 27705
[libx264 @ 0x5627c5267f40] frame P:423   Avg QP: 4.16  size:  6930
[libx264 @ 0x5627c5267f40] frame B:820   Avg QP: 1.56  size:  1130
[libx264 @ 0x5627c5267f40] consecutive B-frames: 13.6%  7.9%  4.8% 73.7%
[libx264 @ 0x5627c5267f40] mb I  I16..4: 69.2% 24.3%  6.4%
[libx264 @ 0x5627c5267f40] mb P  I16..4:  2.0%  9.4%  1.6%  P16..4:  1.7%  0.3%  0.1%  0.0%  0.0%    skip:85.0%
[libx264 @ 0x5627c5267f40] mb B  I16..4:  0.1%  0.3%  0.2%  B16..8:  1.0%  0.1%  0.0%  direct: 0.6%  skip:97.6%  L0:57.9% L1:40.1% BI: 2.0%
[libx264 @ 0x5627c5267f40] 8x8 transform intra:45.7% inter:71.9%
[libx264 @ 0x5627c5267f40] coded y,uvDC,uvAC intra: 36.1% 46.9% 43.4% inter: 0.4% 1.1% 0.7%
[libx264 @ 0x5627c5267f40] i16 v,h,dc,p: 93%  4%  3%  0%
[libx264 @ 0x5627c5267f40] i8 v,h,dc,ddl,ddr,vr,hd,vl,hu: 65%  8% 16%  1%  2%  3%  1%  2%  2%
[libx264 @ 0x5627c5267f40] i4 v,h,dc,ddl,ddr,vr,hd,vl,hu: 50% 20% 10%  3%  4%  5%  3%  4%  2%
[libx264 @ 0x5627c5267f40] i8c dc,h,v,p: 61% 10% 25%  4%
[libx264 @ 0x5627c5267f40] Weighted P-Frames: Y:0.0% UV:0.0%
[libx264 @ 0x5627c5267f40] ref P L0: 72.6%  2.7% 18.0%  6.7%
[libx264 @ 0x5627c5267f40] ref B L0: 89.1%  9.4%  1.5%
[libx264 @ 0x5627c5267f40] ref B L1: 98.0%  2.0%
[libx264 @ 0x5627c5267f40] kb/s:1059.69
[aac @ 0x5627c51d25c0] Qavg: 46028.516
avideo@ubuntu:~$


  


• Measuring success for your SEO content

  20 mars 2020, par Jake Thornton — Uncategorized
  With over a billion searches every day in search engines, it’s hard to underestimate the importance of having your business present on page one (ideally in positions 1 – 3) ranking for the keywords that impact your sales and conversions.

  "In 2019, Google received nearly 2.3 trillion searches and on page one alone, the first five organic results accounted for 67.60% of all the clicks."

  So how is your business performing when it comes to ranking in the crucial top three spots of search for your most important keywords ?

  Accurately measuring the success of your content

  Once you’ve done your keyword research, created compelling content, optimised it to be search-friendly, and hit ‘publish’, you then need to accurately measure the success of your efforts.

  4 tips for measuring the success of your SEO content

  1. Create a custom segment for "Visitors from Search Engines only"

  By creating this custom segment, you’ll be able to analyse the behavioural patterns of the visitors who found your website through a search engine. 

  This way you can use many of Matomo’s powerful features (Visitors, Behaviour, Acquisition, Ecommerce, Goals etc.) focused entirely on search engine visitors only.

  

  Once you’ve created this segment, you can begin to see key metrics like which entry pages are responsible for referring visitors to your website. For example : Visit Behaviour – Entry Pages, this is a great way to analyse your most effective SEO pages.You may be surprised at what pages currently bring in the most traffic.

  As well as discovering which content resonates with your search audience, you will also be able to create more content focused on your targeted audience. Do this by learning which locations your search visitors are from, which device they use, what time of the day they visited your website and much more.

  >> Learn more about creating custom segments

  2. Website visits, time on site, pages per session, and bounce rate.

  “The top four ranking factors are website visits, time on site, pages per session, and bounce rate.”

  These four metrics set the benchmark for your SEO success.

  First, you need to get as many of the ‘right’ users to see your content. If you feel you’ve exhausted channels such as social media, email and possibly paid posts ; think about who your ideal audience is. Where are they likely to hang out online ? Are there community groups or forum sites that are interested in what you’re writing about ? 

  Whatever the case, putting yourself out there and getting more traffic to your website will help show search engines that people are interested in your website. As a result, they’ll likely rank you higher for that.

  When we say getting more of the ‘right’ users, we mean users who are generally interested in the topic/subject you’re writing about and interested in the work you do. 

  

  This is important for the next three metrics – increasing users time on your website, increasing the amount of pages your users explore on your website, and reducing the overall bounce rate for users who leave your website in a matter of seconds.

  To evaluate these metrics, go to Behaviour – Pages in your Matomo and see how these metrics vary on previous posts or pages you’ve created. Which pages are already showing you the best results ? Why do they get the results ? Can you focus on creating more content like this ?

  Understanding what content is resonating with your users through these metrics is easy and is the starting point for measuring the success of your SEO content strategy.

  >> Learn more about the Behaviour feature

  3. Row Evolution

  The Row Evolution feature embedded within the Search Engine Keywords Performance plugin lets you see how your ranking positions have changed over time for your important keywords. It also lets you see how the incoming traffic, related to your keywords, has changed over time.

  

  This is valuable when measuring the changes you’ve made to your landing pages to see if it has a positive or negative effect on your ranking efforts. 

  This also lets you see how search engine algorithm changes affect your search rankings over time, and to see if the effects of these algorithm updates are temporary or long lasting.

  Row evolution allows you to report on keyword performance with ease. If you only check your insights once a week or once a fortnight, you’ll see how ranking positions for your important keywords have changed daily (or even weekly, monthly or yearly however you prefer.)

  >> Learn more about Row Evolution

  4. What results are you getting from the lesser known search engines ?

  "In 2019 (to date), Google accounted for just over 75% of all global desktop search traffic, followed by Bing at 9.97%, Baidu at 9.34%, and Yahoo at 2.77%."

  For most of us, we want to be ranking in the top three spots in Google Search because that’s where the majority of search users are. However, don’t shy away from opportunities you could be missing with lesser known search engines.

  If you sell a product aimed at 55-65 year olds who use a PC computer, chances are they are using Bing. If you have customers in China the majority will be using Baidu, or in our case at Matomo, many of our loyal users use a privacy-friendly search engine like DuckDuckGo or Qwant.

  Some of your ideal customers might be finding you through these alternative search engines, so be sure to measure the impact that these referrals may have on your conversions.

  

  Strategically including important keywords that impact your business

  While search is an important acquisition channel for most businesses, it’s also one of the most competitive.

  We recommend analysing your keyword and content performance regularly and alter content that isn’t performing as well as you’d like. You need to continually learn from the content that is successful, and focus on creating more content like this. 

  The final thing to remember with search keyword performance is to be patient. If you have had little success in the past with attracting customers through search, it can take time to build this reputation with search engines.