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• Latency and DAF in RTP transmissions

  24 février 2023, par jfernandz

  I'm trying to perform some tests for audio RTP transmissions to know their technical limitations. The idea is to prevent DAF effect in this kind of transmissions, I'm assuming a latency lower than 50ms will prevent it. But there is another handicap in my analysis, the RTP transmission must be over WiFi.

  


  For this tests I'm trying to transmit raw audio (not sure if skipping the encoding stage will improve latency) through ffmpeg between two different laptops, so I'm running ffmpeg in the first laptop (172.20.1.2) as :

  


  $ ffmpeg -f pulse -i 56 -c copy -f rtp rtp://172.20.1.5:10000

  


  which produces the following output :

  


  ffmpeg version n5.1.2 Copyright (c) 2000-2022 the FFmpeg developers
  built with gcc 12.2.0 (GCC)
  configuration: --prefix=/usr --disable-debug --disable-static --disable-stripping --enable-amf --enable-avisynth --enable-cuda-llvm --enable-lto --enable-fontconfig --enable-gmp --enable-gnutls --enable-gpl --enable-ladspa --enable-libaom --enable-libass --enable-libbluray --enable-libbs2b --enable-libdav1d --enable-libdrm --enable-libfreetype --enable-libfribidi --enable-libgsm --enable-libiec61883 --enable-libjack --enable-libmfx --enable-libmodplug --enable-libmp3lame --enable-libopencore_amrnb --enable-libopencore_amrwb --enable-libopenjpeg --enable-libopus --enable-libpulse --enable-librav1e --enable-librsvg --enable-libsoxr --enable-libspeex --enable-libsrt --enable-libssh --enable-libsvtav1 --enable-libtheora --enable-libv4l2 --enable-libvidstab --enable-libvmaf --enable-libvorbis --enable-libvpx --enable-libwebp --enable-libx264 --enable-libx265 --enable-libxcb --enable-libxml2 --enable-libxvid --enable-libzimg --enable-nvdec --enable-nvenc --enable-opencl --enable-opengl --enable-shared --enable-version3 --enable-vulkan
  libavutil      57. 28.100 / 57. 28.100
  libavcodec     59. 37.100 / 59. 37.100
  libavformat    59. 27.100 / 59. 27.100
  libavdevice    59.  7.100 / 59.  7.100
  libavfilter     8. 44.100 /  8. 44.100
  libswscale      6.  7.100 /  6.  7.100
  libswresample   4.  7.100 /  4.  7.100
  libpostproc    56.  6.100 / 56.  6.100
Guessed Channel Layout for Input Stream #0.0 : stereo
Input #0, pulse, from '56':
  Duration: N/A, start: 1677234050.938677, bitrate: 1536 kb/s
  Stream #0:0: Audio: pcm_s16le, 48000 Hz, stereo, s16, 1536 kb/s
Output #0, rtp, to 'rtp://172.20.1.5:10000':
  Metadata:
    encoder         : Lavf59.27.100
  Stream #0:0: Audio: pcm_s16le, 48000 Hz, stereo, s16, 1536 kb/s
SDP:
v=0
o=- 0 0 IN IP4 127.0.0.1
s=No Name
c=IN IP4 172.20.1.5
t=0 0
a=tool:libavformat LIBAVFORMAT_VERSION
m=audio 10000 RTP/AVP 97
b=AS:1536

Stream mapping:
  Stream #0:0 -> #0:0 (copy)
Press [q] to stop, [?] for help
size=     322kB time=00:00:01.67 bitrate=1573.6kbits/s speed=1.06x


  


  I'm assuming the shown SDP is a valid one :

  


  v=0
o=- 0 0 IN IP4 127.0.0.1
s=No Name
c=IN IP4 172.20.1.5
t=0 0
a=tool:libavformat LIBAVFORMAT_VERSION
m=audio 10000 RTP/AVP 97
b=AS:1536


  


  So I saved it in a file called ccopy.sdp on the second laptop (172.20.1.5). However, when I run ffplay in this other laptop as :

  


  $ ffplay -protocol_whitelist file,rtp,udp -i ccopy.sdp

  


  I can see there is problems with this SDP :

  


  ffplay version n5.1.2 Copyright (c) 2003-2022 the FFmpeg developers
  built with gcc 12.2.0 (GCC)
  configuration: --prefix=/usr --disable-debug --disable-static --disable-stripping --enable-amf --enable-avisynth --enable-cuda-llvm --enable-lto --enable-fontconfig --enable-gmp --enable-gnutls --enable-gpl --enable-ladspa --enable-libaom --enable-libass --enable-libbluray --enable-libbs2b --enable-libdav1d --enable-libdrm --enable-libfreetype --enable-libfribidi --enable-libgsm --enable-libiec61883 --enable-libjack --enable-libmfx --enable-libmodplug --enable-libmp3lame --enable-libopencore_amrnb --enable-libopencore_amrwb --enable-libopenjpeg --enable-libopus --enable-libpulse --enable-librav1e --enable-librsvg --enable-libsoxr --enable-libspeex --enable-libsrt --enable-libssh --enable-libsvtav1 --enable-libtheora --enable-libv4l2 --enable-libvidstab --enable-libvmaf --enable-libvorbis --enable-libvpx --enable-libwebp --enable-libx264 --enable-libx265 --enable-libxcb --enable-libxml2 --enable-libxvid --enable-libzimg --enable-nvdec --enable-nvenc --enable-opencl --enable-opengl --enable-shared --enable-version3 --enable-vulkan
  libavutil      57. 28.100 / 57. 28.100
  libavcodec     59. 37.100 / 59. 37.100
  libavformat    59. 27.100 / 59. 27.100
  libavdevice    59.  7.100 / 59.  7.100
  libavfilter     8. 44.100 /  8. 44.100
  libswscale      6.  7.100 /  6.  7.100
  libswresample   4.  7.100 /  4.  7.100
  libpostproc    56.  6.100 / 56.  6.100
[sdp @ 0x7f8eec000c80] Could not find codec parameters for stream 0 (Audio: none, 0 channels): unknown codec
Consider increasing the value for the 'analyzeduration' (0) and 'probesize' (5000000) options
Input #0, sdp, from 'ccopy.sdp':
  Metadata:
    title           : No Name
  Duration: N/A, bitrate: N/A
  Stream #0:0: Audio: none, 0 channels
Failed to open file 'ccopy.sdp' or configure filtergraph
    nan    :  0.000 fd=   0 aq=    0KB vq=    0KB sq=    0B f=0/0   


  


  Not sure if I'm doing something wrong or this is because of I cannot actually use pcm_s16le for an RTP transmission. Moreover ... Is there some argument for ffmpeg that I can use to improve this RTP transmission and reduce latency under 50ms.

  


  Thank you all :-)

  


  PS : When I don't use -c copy argument for ffmpeg and therefore I have this SDP

  


  v=0
o=- 0 0 IN IP4 127.0.0.1
s=No Name
c=IN IP4 172.20.1.5
t=0 0
a=tool:libavformat LIBAVFORMAT_VERSION
m=audio 10000 RTP/AVP 97
b=AS:768
a=rtpmap:97 PCMU/48000/2


  


  The RTP transmission works as I expect, but with a significant DAF.

  


• ffmpeg : Generate video from picture

  16 octobre 2013, par Tchoupi

  I'm currently trying to generate a video from a single picture (1980*1024)
  Here my cmd :

  ffmpeg -threads 8 -r 1 -loop 1 -i "C:\Library\Titling\__Resources\1.jpg" -t 5.00 -pix_fmt yuv420p -vcodec libx264 -b:v 1500k -s 720:576 -aspect 1.0000 -y "D:\Records\2013-10-11_115453\PublishingDirectory\Temporary_WithtoutAudio1.mp4"

  here cmd execution :

  ffmpeg version N-56297-g7ac6c63 Copyright (c) 2000-2013 the FFmpeg developers
  
  built on Sep 15 2013 18:02:28 with gcc 4.7.3 (GCC)
  
  configuration: --enable-gpl --enable-version3 --disable-w32threads --enable-avisynth --enable-bzlib --enable-fontconfig --enable-frei0r --enable-gnutls --enable-iconv --enable-libass --enable-libblu
  
  ray --enable-libcaca --enable-libfreetype --enable-libgsm --enable-libilbc --enable-libmodplug --enable-libmp3lame --enable-libopencore-amrnb --enable-libopencore-amrwb --enable-libopenjpeg --enable-l
  
  ibopus --enable-librtmp --enable-libschroedinger --enable-libsoxr --enable-libspeex --enable-libtheora --enable-libtwolame --enable-libvidstab --enable-libvo-aacenc --enable-libvo-amrwbenc --enable-li
  
  bvorbis --enable-libvpx --enable-libx264 --enable-libxavs --enable-libxvid --enable-zlib
  
  libavutil 52. 43.100 / 52. 43.100
  
  libavcodec 55. 31.101 / 55. 31.101
  
  libavformat 55. 16.102 / 55. 16.102
  
  libavdevice 55. 3.100 / 55. 3.100
  
  libavfilter 3. 84.100 / 3. 84.100
  
  libswscale 2. 5.100 / 2. 5.100
  
  libswresample 0. 17.103 / 0. 17.103
  
  libpostproc 52. 3.100 / 52. 3.100
  
  Input #0, image2, from 'C:\Library\Titling\__Resources\1.jpg':
  
  Duration: 00:00:00.04, start: 0.000000, bitrate: N/A
  
  Stream #0:0: Video: mjpeg, yuvj420p(pc), 1920x1080 [SAR 96:96 DAR 16:9], 25 fps, 25 tbr, 25 tbn, 25 tbc
  
  [swscaler @ 025bec00] deprecated pixel format used, make sure you did set range correctly
  
  [libx264 @ 025b7ce0] using SAR=4/5
  
  [libx264 @ 025b7ce0] using cpu capabilities: MMX2 SSE2Fast SSSE3 SSE4.2 AVX
  
  [libx264 @ 025b7ce0] profile High, level 2.2
  
  [libx264 @ 025b7ce0] 264 - core 135 r2345 f0c1c53 - H.264/MPEG-4 AVC codec - Copyleft 2003-2013 - http://www.videolan.org/x264.html - options: cabac=1 ref=3 deblock=1:0:0 analyse=0x3:0x113 me=hex subm
  
  e=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=12 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=2 keyint=250 keyint_min=1 scenecut=40 intra_refresh=0 rc_lookahead=40 rc
  
  =abr mbtree=1 bitrate=1500 ratetol=1.0 qcomp=0.60 qpmin=0 qpmax=69 qpstep=4 ip_ratio=1.40 aq=1:1.00
  
  Output #0, mp4, to 'D:\Records\2013-10-11_115453\PublishingDirectory\Temporary_WithtoutAudio1.mp4':
  
  Metadata:
  
  encoder : Lavf55.16.102
  
  Stream #0:0: Video: h264 (libx264) ([33][0][0][0] / 0x0021), yuv420p, 720x576 [SAR 4:5 DAR 1:1], q=-1--1, 1500 kb/s, 16384 tbn, 1 tbc
  
  Stream mapping:
  
  Stream #0:0 -> #0:0 (mjpeg -> libx264)
  
  Press [q] to stop, [?] for help
  
  frame= 5 fps=0.0 q=-1.0 Lsize= 64kB time=00:00:03.00 bitrate= 174.0kbits/s
  
  video:63kB audio:0kB subtitle:0 global headers:0kB muxing overhead 1.355758%
  
  [libx264 @ 025b7ce0] frame I:1 Avg QP: 0.00 size: 63203
  
  [libx264 @ 025b7ce0] frame P:1 Avg QP: 0.00 size: 250
  
  [libx264 @ 025b7ce0] frame B:3 Avg QP: 0.00 size: 64
  
  [libx264 @ 025b7ce0] consecutive B-frames: 20.0% 0.0% 0.0% 80.0%
  
  [libx264 @ 025b7ce0] mb I I16..4: 78.8% 4.0% 17.2%
  
  [libx264 @ 025b7ce0] mb P I16..4: 0.0% 0.0% 0.0% P16..4: 1.2% 0.0% 0.1% 0.0% 0.0% skip:98.6%
  
  [libx264 @ 025b7ce0] mb B I16..4: 0.0% 0.0% 0.0% B16..8: 0.9% 0.0% 0.0% direct: 0.0% skip:99.0% L0:12.8% L1:87.2% BI: 0.0%
  
  [libx264 @ 025b7ce0] final ratefactor: -14.43
  
  [libx264 @ 025b7ce0] 8x8 transform intra:4.0% inter:0.0%
  
  [libx264 @ 025b7ce0] coded y,uvDC,uvAC intra: 22.8% 24.1% 24.1% inter: 0.2% 0.0% 0.0%
  
  [libx264 @ 025b7ce0] i16 v,h,dc,p: 93% 1% 4% 2%
  
  [libx264 @ 025b7ce0] i8 v,h,dc,ddl,ddr,vr,hd,vl,hu: 26% 19% 13% 6% 6% 7% 7% 12% 4%
  
  [libx264 @ 025b7ce0] i4 v,h,dc,ddl,ddr,vr,hd,vl,hu: 23% 15% 11% 7% 7% 9% 7% 14% 6%
  
  [libx264 @ 025b7ce0] i8c dc,h,v,p: 85% 4% 6% 5%
  
  [libx264 @ 025b7ce0] Weighted P-Frames: Y:0.0% UV:0.0%
  
  [libx264 @ 025b7ce0] kb/s:101.83

  At this step I have two problems :
  first is a warning during execution
  deprecated pixel format used, make sure you did set range correctly
  The second is the video do not work correctly in VLC (video is "black") but it work in wmp...
  

  Then I add an empty audio track :

  ffmpeg -threads 8 -f lavfi -i aevalsrc=0 -i "D:\Records\2013-10-11_115453\PublishingDirectory\Temporary_WithtoutAudio1.mp4" -vcodec copy -b:v 1500k -acodec aac -map 1:0 -map 0:0 -shortest -strict experimental -y "D:\Records\2013-10-11_115453\PublishingDirectory\Temporary1.mp4"

  After that I concat this video to others using complex filter .
  When I concat my videos I have this message :
  

  [output stream 0:1 @ 0451d3a0] 100 buffers queued in output stream 0:1, something may be wrong.

  And when i Watch the result my video freeze after the image insertion for a approximatly a seconde .
  perhaps it is not related
  I don't know ...

  Here my concat command and execution log
  

  D:\test>ffmpeg.exe -threads 8 -i "D:\Records\2013-10-11_115453\PublishingDirectory\Temporary0.mp4" -i "D:\Records\2013-10-11_115453\PublishingDirectory\Temporary1.mp4" -i "D:\Records\2013-10-11_115
  
  453\PublishingDirectory\Temporary2.mp4" -filter_complex "[0:v] [0:a] [1:v] [1:a] [2:v] [2:a] concat=n=3:v=1:a=1 [v] [a] " -map "[v]" -map "[a]" -vcodec libx264 -b 1500000 -s 720:576 -y "D:\Records\
  
  2013-10-11_115453\PublishingDirectory\EditedVideo.mp4"

  ..

  ffmpeg version N-56297-g7ac6c63 Copyright (c) 2000-2013 the FFmpeg developers
  
  built on Sep 15 2013 18:02:28 with gcc 4.7.3 (GCC)
  
  configuration: --enable-gpl --enable-version3 --disable-w32threads --enable-avisynth --enable-bzlib --enable-fontconfig --enable-frei0r --enable-gnutls --enable-iconv --enable-libass --enable-libblu
  
  ray --enable-libcaca --enable-libfreetype --enable-libgsm --enable-libilbc --enable-libmodplug --enable-libmp3lame --enable-libopencore-amrnb --enable-libopencore-amrwb --enable-libopenjpeg --enable-l
  
  ibopus --enable-librtmp --enable-libschroedinger --enable-libsoxr --enable-libspeex --enable-libtheora --enable-libtwolame --enable-libvidstab --enable-libvo-aacenc --enable-libvo-amrwbenc --enable-li
  
  bvorbis --enable-libvpx --enable-libx264 --enable-libxavs --enable-libxvid --enable-zlib
  
  libavutil 52. 43.100 / 52. 43.100
  
  libavcodec 55. 31.101 / 55. 31.101
  
  libavformat 55. 16.102 / 55. 16.102
  
  libavdevice 55. 3.100 / 55. 3.100
  
  libavfilter 3. 84.100 / 3. 84.100
  
  libswscale 2. 5.100 / 2. 5.100
  
  libswresample 0. 17.103 / 0. 17.103
  
  libpostproc 52. 3.100 / 52. 3.100
  
  Input #0, mov,mp4,m4a,3gp,3g2,mj2, from 'D:\Records\2013-10-11_115453\PublishingDirectory\Temporary0.mp4':
  
  Metadata:
  
  major_brand : isom
  
  minor_version : 512
  
  compatible_brands: isomiso2avc1mp41
  
  title : Wildlife in HD
  
  encoder : Lavf54.22.100
  
  comment : Footage: Small World Productions, Inc; Tourism New Zealand | Producer: Gary F. Spradling | Music: Steve Ball
  
  copyright : ┬® 2008 Microsoft Corporation
  
  Duration: 00:00:13.70, start: 0.000000, bitrate: 1914 kb/s
  
  Stream #0:0(eng): Video: h264 (High) (avc1 / 0x31637661), yuv420p, 720x576 [SAR 4:5 DAR 1:1], 1778 kb/s, 29.97 fps, 29.97 tbr, 30k tbn, 59.94 tbc (default)
  
  Metadata:
  
  handler_name : VideoHandler
  
  Stream #0:1(eng): Audio: aac (mp4a / 0x6134706D), 44100 Hz, stereo, fltp, 128 kb/s (default)
  
  Metadata:
  
  handler_name : SoundHandler
  
  Input #1, mov,mp4,m4a,3gp,3g2,mj2, from 'D:\Records\2013-10-11_115453\PublishingDirectory\Temporary1.mp4':
  
  Metadata:
  
  major_brand : isom
  
  minor_version : 512
  
  compatible_brands: isomiso2avc1mp41
  
  encoder : Lavf55.16.102
  
  Duration: 00:00:05.00, start: 0.023220, bitrate: 106 kb/s
  
  Stream #1:0(und): Video: h264 (High) (avc1 / 0x31637661), yuv420p, 720x576 [SAR 4:5 DAR 1:1], 102 kb/s, 1 fps, 1 tbr, 16384 tbn, 2 tbc (default)
  
  Metadata:
  
  handler_name : VideoHandler
  
  Stream #1:1(und): Audio: aac (mp4a / 0x6134706D), 44100 Hz, mono, fltp, 1 kb/s (default)
  
  Metadata:
  
  handler_name : SoundHandler
  
  Input #2, mov,mp4,m4a,3gp,3g2,mj2, from 'D:\Records\2013-10-11_115453\PublishingDirectory\Temporary2.mp4':
  
  Metadata:
  
  major_brand : isom
  
  minor_version : 512
  
  compatible_brands: isomiso2avc1mp41
  
  title : Wildlife in HD
  
  encoder : Lavf54.22.100
  
  comment : Footage: Small World Productions, Inc; Tourism New Zealand | Producer: Gary F. Spradling | Music: Steve Ball
  
  copyright : ┬® 2008 Microsoft Corporation
  
  Duration: 00:00:16.47, start: 0.000000, bitrate: 2761 kb/s
  
  Stream #2:0(eng): Video: h264 (High) (avc1 / 0x31637661), yuv420p, 720x576 [SAR 4:5 DAR 1:1], 2625 kb/s, 29.97 fps, 29.97 tbr, 30k tbn, 59.94 tbc (default)
  
  Metadata:
  
  handler_name : VideoHandler
  
  Stream #2:1(eng): Audio: aac (mp4a / 0x6134706D), 44100 Hz, stereo, fltp, 128 kb/s (default)
  
  Metadata:
  
  handler_name : SoundHandler
  
  Please use -b:a or -b:v, -b is ambiguous
  
  [libx264 @ 04c748e0] using SAR=4/5
  
  [libx264 @ 04c748e0] using cpu capabilities: MMX2 SSE2Fast SSSE3 SSE4.2 AVX
  
  [libx264 @ 04c748e0] profile High, level 3.1
  
  [libx264 @ 04c748e0] 264 - core 135 r2345 f0c1c53 - H.264/MPEG-4 AVC codec - Copyleft 2003-2013 - http://www.videolan.org/x264.html - options: cabac=1 ref=3 deblock=1:0:0 analyse=0x3:0x113 me=hex subm
  
  e=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=12 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=2 keyint=250 keyint_min=25 scenecut=40 intra_refresh=0 rc_lookahead=40 r
  
  c=abr mbtree=1 bitrate=1500 ratetol=1.0 qcomp=0.60 qpmin=0 qpmax=69 qpstep=4 ip_ratio=1.40 aq=1:1.00
  
  Output #0, mp4, to 'D:\Records\2013-10-11_115453\PublishingDirectory\EditedVideo.mp4':
  
  Metadata:
  
  major_brand : isom
  
  minor_version : 512
  
  compatible_brands: isomiso2avc1mp41
  
  title : Wildlife in HD
  
  copyright : ┬® 2008 Microsoft Corporation
  
  comment : Footage: Small World Productions, Inc; Tourism New Zealand | Producer: Gary F. Spradling | Music: Steve Ball
  
  encoder : Lavf55.16.102
  
  Stream #0:0: Video: h264 (libx264) ([33][0][0][0] / 0x0021), yuv420p, 720x576 [SAR 4:5 DAR 1:1], q=-1--1, 1500 kb/s, 30k tbn, 29.97 tbc
  
  Stream #0:1: Audio: aac (libvo_aacenc) ([64][0][0][0] / 0x0040), 44100 Hz, stereo, s16, 128 kb/s
  
  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
  
  Stream #2:0 (h264) -> concat:in2:v0
  
  Stream #2:1 (aac) -> concat:in2:a0
  
  concat:out:v0 -> Stream #0:0 (libx264)
  
  concat:out:a0 -> Stream #0:1 (libvo_aacenc)
  
  Press [q] to stop, [?] for help
  
  [output stream 0:1 @ 0451d3a0] 100 buffers queued in output stream 0:1, something may be wrong.
  
  frame= 1054 fps=101 q=-1.0 Lsize= 7676kB time=00:00:35.23 bitrate=1784.7kbits/s dup=146 drop=0
  
  video:7083kB audio:552kB subtitle:0 global headers:0kB muxing overhead 0.543084%
  
  [libx264 @ 04c748e0] frame I:10 Avg QP:18.41 size: 52713
  
  [libx264 @ 04c748e0] frame P:456 Avg QP:24.04 size: 11772
  
  [libx264 @ 04c748e0] frame B:588 Avg QP:26.20 size: 2308
  
  [libx264 @ 04c748e0] consecutive B-frames: 2.8% 67.9% 1.1% 28.1%
  
  [libx264 @ 04c748e0] mb I I16..4: 23.1% 52.7% 24.2%
  
  [libx264 @ 04c748e0] mb P I16..4: 0.6% 4.3% 1.0% P16..4: 35.8% 18.5% 11.9% 0.0% 0.0% skip:27.8%
  
  [libx264 @ 04c748e0] mb B I16..4: 0.1% 0.8% 0.2% B16..8: 34.2% 5.0% 1.3% direct: 1.3% skip:57.0% L0:37.3% L1:53.3% BI: 9.3%
  
  [libx264 @ 04c748e0] final ratefactor: 23.46
  
  [libx264 @ 04c748e0] 8x8 transform intra:67.7% inter:60.0%
  
  [libx264 @ 04c748e0] coded y,uvDC,uvAC intra: 67.1% 69.5% 30.5% inter: 17.0% 11.0% 0.4%
  
  [libx264 @ 04c748e0] i16 v,h,dc,p: 50% 20% 6% 24%
  
  [libx264 @ 04c748e0] i8 v,h,dc,ddl,ddr,vr,hd,vl,hu: 18% 16% 18% 6% 8% 10% 7% 9% 8%
  
  [libx264 @ 04c748e0] i4 v,h,dc,ddl,ddr,vr,hd,vl,hu: 19% 16% 14% 7% 10% 12% 8% 8% 7%
  
  [libx264 @ 04c748e0] i8c dc,h,v,p: 53% 20% 19% 8%
  
  [libx264 @ 04c748e0] Weighted P-Frames: Y:0.4% UV:0.0%
  
  [libx264 @ 04c748e0] ref P L0: 63.9% 19.2% 11.1% 5.7% 0.0%
  
  [libx264 @ 04c748e0] ref B L0: 90.4% 9.0% 0.6%
  
  [libx264 @ 04c748e0] ref B L1: 97.8% 2.2%
  
  [libx264 @ 04c748e0] kb/s:1649.69

  So How can I Fix my "picture" video ?
  Will it fix the freeze problem after concatenation of videos ?
  If not How can I fix it ?
  

  Thanks in advance !
  

• Record sound with ffmpeg on ubuntu 12.04 [closed]

  27 juin 2012, par vzybilly

  I have been working for a few days on trying to get ffmpeg to record sound, a short list of what I've tried :

  #Crappy screen grab
  
  #ffmpeg -f x11grab -s "1366x768" -r "24" -i :0.0 -f mp4 ./out
  
  #awesome screen grab, grabbing sound but non out.
  
  #ffmpeg -f x11grab -s "1366x768" -r "24" -i :0.0 -f alsa -ac 2 -i pulse -vcodec libx264 -s "1366x768" -acodec libmp3lame -ab 128k -threads 0 -f mp4 ~/Desktop/vid
  
  #audio test, no audio in file.
  
  #ffmpeg -f alsa -ac 2 -i pulse -acodec libmp3lame -ab 128k -threads 0 -f mp3 ./test.mp3
  
  #awesome screen grab.
  
  #ffmpeg -f x11grab -s "1366x768" -r "24" -i :0.0 -threads 0 -sameq -an -f mp4 ~/Desktop/vid[/CODE]I'm running ubuntu 12.04 from beta(ish)

  it would be awesome if someone could help me get this to work all in one line or (the way i'm going) multiple instances of ffmpeg (screen grab, microphone, program)

  I have also tried the pavucontrol with doing the monitoring of when recording audio, but that does not help either.

  Thanks for all of your help, vzybilly 

  EDIT :
  This one crashed.

  $ ffmpeg -f alsa -ac 2 -i plughw:0,0 -f x11grab -r 100 -s 1366x768 -i :0.0 -acodec pcm_s16le -vcodec libx264 -preset ultrafast -threads 3 testVid.mkv
  
  ffmpeg version 0.8.3-4:0.8.3-0ubuntu0.12.04.1, Copyright (c) 2000-2012 the Libav developers
  
    built on Jun 12 2012 16:37:58 with gcc 4.6.3
  
  *** THIS PROGRAM IS DEPRECATED ***
  
  This program is only provided for compatibility and will be removed in a future release. Please use avconv instead.
  
  [alsa @ 0x8fce240] capture with some ALSA plugins, especially dsnoop, may hang.
  
  [alsa @ 0x8fce240] Estimating duration from bitrate, this may be inaccurate
  
  Input #0, alsa, from 'plughw:0,0':
  
    Duration: N/A, start: 433.999945, bitrate: N/A
  
      Stream #0.0: Audio: pcm_s16le, 48000 Hz, 2 channels, s16, 1536 kb/s
  
  [x11grab @ 0x8fde820] device: :0.0 -> display: :0.0 x: 0 y: 0 width: 1366 height: 768
  
  [x11grab @ 0x8fde820] shared memory extension  found
  
  [x11grab @ 0x8fde820] Estimating duration from bitrate, this may be inaccurate
  
  Input #1, x11grab, from ':0.0':
  
    Duration: N/A, start: 1340805516.368518, bitrate: N/A
  
      Stream #1.0: Video: rawvideo, bgra, 1366x768, -2147483 kb/s, 100 tbr, 1000k tbn, 100 tbc
  
  File 'testVid.mkv' already exists. Overwrite ? [y/N] y
  
  Incompatible pixel format 'bgra' for codec 'libx264', auto-selecting format 'yuv420p'
  
  [buffer @ 0x8fde700] w:1366 h:768 pixfmt:bgra
  
  [avsink @ 0x8fcdf20] auto-inserting filter 'auto-inserted scaler 0' between the filter 'src' and the filter 'out'
  
  [scale @ 0x8ff3ce0] w:1366 h:768 fmt:bgra -> w:1366 h:768 fmt:yuv420p flags:0x4
  
  [libx264 @ 0x8fdd920] lookaheadless mb-tree requires intra refresh or infinite keyint
  
  [libx264 @ 0x8fdd920] using cpu capabilities: MMX2 SSE2Fast SSSE3 FastShuffle SSE4.2
  
  [libx264 @ 0x8fdd920] profile Constrained Baseline, level 4.2
  
  [libx264 @ 0x8fdd920] 264 - core 120 r2151 a3f4407 - H.264/MPEG-4 AVC codec - Copyleft 2003-2011 - 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 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=1.25 aq=0
  
  Output #0, matroska, to 'archinstall4.mkv':
  
    Metadata:
  
      encoder         : Lavf53.21.0
  
      Stream #0.0: Video: libx264, yuv420p, 1366x768, q=-1--1, 1k tbn, 100 tbc
  
      Stream #0.1: Audio: pcm_s16le, 48000 Hz, 2 channels, s16, 1536 kb/s
  
  Stream mapping:
  
    Stream #1.0 -> #0.0
  
    Stream #0.0 -> #0.1
  
  Press ctrl-c to stop encoding
  
  [alsa @ 0x8fce240] ALSA buffer xrun.
  
  [matroska @ 0x8fcd980] Application provided invalid, non monotonically increasing dts to muxer in stream 1: 213 >= 213
  
  av_interleaved_write_frame(): Invalid argument

  Any thoughts ?

  EDIT & ANSWER :
  Got it all working with a script :

  #!/bin/bash
  
  #vzybilly
  
  #these are temp files
  
  aud="aud.mp3"
  
  vid="vid.mp4"
  
  #grab audio & pid
  
  ffmpeg -f alsa -ac 2 -i plughw:0,0 $aud &
  
  audPID=$!
  
  #grab screen & pid
  
  ffmpeg -f x11grab -s "1366x768" -r "24" -i :0.0 -threads 0 -sameq -an -f mp4 $vid &
  
  vidPID=$!
  
  #wait, till name given (that means stop)
  
  read -p "Stop by giving an Output video name?" out
  
  #stop audio and video with pids
  
  kill -n 2 $audPID
  
  kill -n 2 $vidPID
  
  echo "$out"
  
  #combine to the target output file
  
  ffmpeg -i $aud -i $vid -acodec copy -vcodec copy "$out"
  
  #purge the temp files
  
  rm $aud
  
  rm $vid