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• ffmpeg doesn't correctly work with mkv

  26 avril 2017, par Alex

  Now I’m trying to trim mkv file with ffmpeg command.

  ffmpeg -y -i 1.mkv -filter_complex "[0:0]trim=start=201:duration=28,setpts=PTS-STARTPTS" a.mp4

  after processing a.mp4 is created with length(28s), but there is problems.

  1. Video is some flapped while playing.
  2. Audio is continued though playing has ended beyond 28s.

  So could you guys tell me what can I do ?

  When ffmpeg processing, it shows some errors as like this :

  D:\Work\ffmpeg\files> ffmpeg -y -i 1.mkv -filter_complex "[0:0]trim=start=201:duration=28,setpts=PTS-STARTPTS" a.mp4
  
  ffmpeg version N-77883-gd7c75a5 Copyright (c) 2000-2016 the FFmpeg developers
  
    built with gcc 5.2.0 (GCC)
  
    configuration: --disable-static --enable-shared --enable-gpl --enable-version3 --disable-w32threads --enable-avisynth --enable-bzlib --enable-fontconfig --enable-frei0r --enable-gnutls --enable-iconv --enable-libass --enable-libbluray --enable-libbs2b --enable-libcaca --enable-libdcadec --enable-libfreetype --enable-libgme --enable-libgsm --enable-libilbc --enable-libmodplug --enable-libmp3lame --enable-libopencore-amrnb --enable-libopencore-amrwb --enable-libopenjpeg --enable-libopus --enable-librtmp --enable-libschroedinger --enable-libsoxr --enable-libspeex --enable-libtheora --enable-libtwolame --enable-libvidstab --enable-libvo-aacenc --enable-libvo-amrwbenc --enable-libvorbis --enable-libvpx --enable-libwavpack --enable-libwebp --enable-libx264 --enable-libx265 --enable-libxavs --enable-libxvid --enable-libzimg --enable-lzma --enable-decklink --enable-zlib
  
    libavutil      55. 13.100 / 55. 13.100
  
    libavcodec     57. 22.100 / 57. 22.100
  
    libavformat    57. 21.101 / 57. 21.101
  
    libavdevice    57.  0.100 / 57.  0.100
  
    libavfilter     6. 25.100 /  6. 25.100
  
    libswscale      4.  0.100 /  4.  0.100
  
    libswresample   2.  0.101 /  2.  0.101
  
    libpostproc    54.  0.100 / 54.  0.100
  
  Guessed Channel Layout for  Input Stream #0.1 : mono
  
  Input #0, matroska,webm, from '1.mkv':
  
    Metadata:
  
      ENCODER         : Lavf56.1.0
  
    Duration: 00:35:40.08, start: 0.000000, bitrate: 348 kb/s
  
      Stream #0:0: Video: vp8, yuv420p, 640x480, SAR 1:1 DAR 4:3, 29.97 fps, 29.97 tbr, 1k tbn, 1k tbc
  
      Stream #0:1: Audio: pcm_mulaw ([7][0][0][0] / 0x0007), 8000 Hz, 1 channels, s16, 64 kb/s
  
  [libx264 @ 000002859baf3300] using SAR=1/1
  
  [libx264 @ 000002859baf3300] using cpu capabilities: MMX2 SSE2Fast SSSE3 SSE4.2 AVX
  
  [libx264 @ 000002859baf3300] profile High, level 3.0
  
  [libx264 @ 000002859baf3300] 264 - core 148 r2638 7599210 - H.264/MPEG-4 AVC codec - Copyleft 2003-2015 - 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=250 keyint_min=25 scenecut=40 intra_refresh=0 rc_lookahead=40 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, mp4, to 'a.mp4':
  
    Metadata:
  
      encoder         : Lavf57.21.101
  
      Stream #0:0: Video: h264 (libx264) ([33][0][0][0] / 0x0021), yuv420p, 640x480 [SAR 1:1 DAR 4:3], q=-1--1, 29.97 fps, 30k tbn, 29.97 tbc
  
      Metadata:
  
        encoder         : Lavc57.22.100 libx264
  
      Side data:
  
        unknown side data type 10 (24 bytes)
  
      Stream #0:1: Audio: aac (LC) ([64][0][0][0] / 0x0040), 8000 Hz, mono, fltp, 48 kb/s
  
      Metadata:
  
        encoder         : Lavc57.22.100 aac
  
  Stream mapping:
  
    Stream #0:0 (vp8) -> trim (graph 0)
  
    setpts (graph 0) -> Stream #0:0 (libx264)
  
    Stream #0:1 -> #0:1 (pcm_mulaw (native) -> aac (native))
  
  Press [q] to stop, [?] for help
  
  [vp8 @ 000002859d9ae460] Discarding interframe without a prior keyframe!
  
  [vp8 @ 000002859d9aeb00] Discarding interframe without a prior keyframe!
  
  [vp8 @ 000002859e8eee40] Discarding interframe without a prior keyframe!
  
  [vp8 @ 000002859e8f5460] Discarding interframe without a prior keyframe!
  
  Error while decoding stream #0:0: Invalid data found when processing input
  
      Last message repeated 3 times
  
  frame=    0 fps=0.0 q=0.0 size=      62kB time=00:00:22.27 bitrate=  22.6kbits/s
  
  frame=    0 fps=0.0 q=0.0 size=     154kB time=00:00:41.08 bitrate=  30.6kbits/s
  
  frame=    0 fps=0.0 q=0.0 size=     255kB time=00:01:02.20 bitrate=  33.6kbits/s
  
  frame=    0 fps=0.0 q=0.0 size=     340kB time=00:01:19.34 bitrate=  35.1kbits/s
  
  frame=    0 fps=0.0 q=0.0 size=     423kB time=00:01:39.31 bitrate=  34.9kbits/s
  
  frame=   88 fps= 29 q=29.0 size=     518kB time=00:01:43.79 bitrate=  40.9kbits/
  
  frame=  140 fps= 40 q=29.0 size=     613kB time=00:01:45.46 bitrate=  47.6kbits/
  
  frame=  194 fps= 48 q=29.0 size=     719kB time=00:01:47.38 bitrate=  54.8kbits/
  
  
  
  ...
  
  
  
  
  
  frame=  839 fps= 14 q=29.0 size=   10881kB time=00:34:51.52 bitrate=  42.6kbits/
  
  frame=  839 fps= 14 q=29.0 size=   10962kB time=00:35:10.46 bitrate=  42.5kbits/
  
  frame=  839 fps= 14 q=29.0 size=   11031kB time=00:35:25.44 bitrate=  42.5kbits/
  
  frame=  839 fps= 14 q=-1.0 Lsize=   11266kB time=00:35:40.16 bitrate=  43.1kbits/s dup=284 drop=328 speed=34.6x
  
  video:1083kB audio:10104kB subtitle:0kB other streams:0kB global headers:0kB muxing overhead: 0.706855%
  
  [libx264 @ 000002859baf3300] frame I:4     Avg QP:15.24  size: 22651
  
  [libx264 @ 000002859baf3300] frame P:305   Avg QP:19.95  size:  2626
  
  [libx264 @ 000002859baf3300] frame B:530   Avg QP:25.41  size:   408
  
  [libx264 @ 000002859baf3300] consecutive B-frames: 15.7%  0.0%  0.4% 83.9%
  
  [libx264 @ 000002859baf3300] mb I  I16..4: 15.9% 63.7% 20.4%
  
  [libx264 @ 000002859baf3300] mb P  I16..4:  0.3%  1.9%  0.3%  P16..4: 22.3%  6.2%  2.4%  0.0%  0.0%    skip:66.5%
  
  [libx264 @ 000002859baf3300] mb B  I16..4:  0.0%  0.1%  0.0%  B16..8: 16.1%  0.6%  0.1%  direct: 0.2%  skip:82.9%  L0:48.2% L1:48.5% BI: 3.4%
  
  [libx264 @ 000002859baf3300] 8x8 transform intra:71.1% inter:71.4%
  
  [libx264 @ 000002859baf3300] coded y,uvDC,uvAC intra: 72.2% 78.3% 40.7% inter: 5.9% 4.0% 0.1%
  
  [libx264 @ 000002859baf3300] i16 v,h,dc,p: 29% 30% 21% 20%
  
  [libx264 @ 000002859baf3300] i8 v,h,dc,ddl,ddr,vr,hd,vl,hu: 28% 18% 14%  5%  6%  9%  6%  9%  6%
  
  [libx264 @ 000002859baf3300] i4 v,h,dc,ddl,ddr,vr,hd,vl,hu: 38% 20% 11%  5%  5%  7%  5%  6%  4%
  
  [libx264 @ 000002859baf3300] i8c dc,h,v,p: 46% 16% 27% 11%
  
  [libx264 @ 000002859baf3300] Weighted P-Frames: Y:0.0% UV:0.0%
  
  [libx264 @ 000002859baf3300] ref P L0: 63.4% 21.5% 11.5%  3.6%
  
  [libx264 @ 000002859baf3300] ref B L0: 92.6%  6.4%  1.0%
  
  [libx264 @ 000002859baf3300] ref B L1: 96.4%  3.6%
  
  [libx264 @ 000002859baf3300] kb/s:316.59
  
  [aac @ 000002859baf4400] Qavg: 65377.508
  
  
  
  D:\Work\ffmpeg\files>

  ---

• QML Video doesn't work robust with UDP streaming

  4 avril 2017, par user2810472

  I am using QT/QML to write a player for raspberry-pi. I need to know what is the best practice of using Video QML element for a robust streaming play.

  My QML code is like below,

  Video {
  
      id: streaming_video
  
      width : parent.width
  
      height : parent.height
  
      autoPlay: false;
  
      opacity: 0.0
  
      fillMode : Image.Stretch
  
      muted : false
  
  }
  
  
  
  function switch_udpstream_on() {
  
      streaming_video.opacity = 1.0;
  
      streaming_video.source = "udp://localhost:7777";
  
      streaming_video.play();
  
  }
  
  
  
  function switch_udpstream_off() {
  
      streaming_video.opacity = 0.0;
  
      streaming_video.stop();
  
  }

  Once I started streaming sender like below,

  ffmpeg -re -i 519183632_4.mp4 -vcodec libx264 -pix_fmt yuv420p -tune zerolatency -preset ultrafast -f mpegts udp://rpi-ip:7777

  It shows the load of logs rpi player back end and start infinitely printing,

  WARNING : No decoded frame to show at all. Let’ render black.

  even though I stop sender, player is not stopping printing the above.

  If I use ffplay instead, it works fine.

• FFMPEG PUSH to NGINX RTMP server does not work on interlaced content

  1er septembre 2022, par Sambir

  when i add -top 1 -flags +ildct+ilme and push it to the NGINX RTMP server it is unable to "decode" and broadcast the stream. Am i missing something or is NGINX unable to process interlaced content ? FFMPEG works fine with both commands. I also saved the output to a file to check if there is any issues with the output but it looks fine.

  


  My command which doesnt work on the NGINX RTMP server :

  


  ffmpeg -timeout 10000000 -reconnect 1 -reconnect_at_eof 1 -reconnect_streamed 1 -reconnect_delay_max 2 -hwaccel_device 2 -hwaccel cuvid -vcodec h264_cuvid -vcodec h264_cuvid -i 'http://URL' -map 0:1 -map 0:2 -acodec libfdk_aac -b:a 96k -c:v h264_nvenc -gpu 2 -preset llhq -vprofile high -level 4.1 -top 1 -flags +ildct+ilme -color_primaries bt709 -color_trc bt709 -colorspace bt709 -color_range tv -rc:v vbr -qmin:v 18 -qmax:v 42 -b:v 6M -maxrate 6M -bufsize 12M -threads 0 -r 25 -g 100 -refs 2 -bf 3 -f flv 'rtmp://OUTPUT'


  


  This code works fine :

  


  ffmpeg -timeout 10000000 -reconnect 1 -reconnect_at_eof 1 -reconnect_streamed 1 -reconnect_delay_max 2 -hwaccel_device 2 -hwaccel cuvid -vcodec h264_cuvid -vcodec h264_cuvid -i 'http://URL' -map 0:1 -map 0:2 -acodec libfdk_aac -b:a 96k -c:v h264_nvenc -gpu 2 -preset llhq -vprofile high -level 4.1 -color_primaries bt709 -color_trc bt709 -colorspace bt709 -color_range tv -rc:v vbr -qmin:v 18 -qmax:v 42 -b:v 6M -maxrate 6M -bufsize 12M -threads 0 -r 25 -g 100 -refs 2 -bf 3 -f flv 'rtmp://OUTPUT'


  


  The rtmp server then processes the stream and broadcasts it without any problems