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  • ffmpeg concat doesn't keep video speed/framerate ?

    28 août 2016, par Nick

    I have a bunch of small webm clips in directory vidchunks. These clips were generated using javascript MediaRecorder API.

    MediaRecorder code :

    var mRecorder;
    
var chunks = [];
    
navigator.mediaDevices.getUserMedia({
    
  audio: false,
    
  video: {
    
  width: 1280,
    
  height: 760,
    
  mozMediaSource: "screen",
    
  mediaSource: "screen"
    
}
    
}).then(function(stream) {
    
  mRecorder = new MediaRecorder(stream,{mimeType:"video/webm"});
    
  mRecorder.ondataavailable = function(event) {
    
    var blob = event.data;
    
    chunks.push(blob);
    
    var vidchunk = new Blob(chunks);
    
    // save to directory vid chunk.
    
  };
    
  mRecorder.start(5000);
    
}).catch(function(error) {
    
  console.log(error.message);
    
});

    Then, once I have a bunch of these 5 second clips, I merge them :

    ffmpeg -safe 0 \
    
-f concat -i <(for f in `ls vidchunks/* | sort -V`; do echo file $f; done) \
    
-c:v copy -r 30 -vsync drop test.webm

    When I play back these chunks individually, they play correctly. All 5 seconds of video are rendered smoothly.

    However, once I merge, some 5 second chunks are condensed to like 1 second. So the total video, which should be 50 seconds for 10 chunks, turns out to be like 38 seconds because three of the chunks got condensed to 1 second.

    Any ideas on how to fix this ?

    EDIT : I’ve tried :

    • without "-r 30 -vsync drop"
    • without "-c:v copy"

    No changes...

    EDIT2 (some ffprobe outputs) :

    ffprobe 1472343170-1.webm

    ffprobe version 2.8.6-1ubuntu2 Copyright (c) 2007-2016 the FFmpeg developers
    
  built with gcc 5.3.1 (Ubuntu 5.3.1-11ubuntu1) 20160311
    
  configuration: --prefix=/usr --extra-version=1ubuntu2 --build-suffix=-ffmpeg --toolchain=hardened --libdir=/usr/lib/x86_64-linux-gnu --incdir=/usr/include/x86_64-linux-gnu --cc=cc --cxx=g++ --enable-gpl --enable-shared --disable-stripping --disable-decoder=libopenjpeg --disable-decoder=libschroedinger --enable-avresample --enable-avisynth --enable-gnutls --enable-ladspa --enable-libass --enable-libbluray --enable-libbs2b --enable-libcaca --enable-libcdio --enable-libflite --enable-libfontconfig --enable-libfreetype --enable-libfribidi --enable-libgme --enable-libgsm --enable-libmodplug --enable-libmp3lame --enable-libopenjpeg --enable-libopus --enable-libpulse --enable-librtmp --enable-libschroedinger --enable-libshine --enable-libsnappy --enable-libsoxr --enable-libspeex --enable-libssh --enable-libtheora --enable-libtwolame --enable-libvorbis --enable-libvpx --enable-libwavpack --enable-libwebp --enable-libx265 --enable-libxvid --enable-libzvbi --enable-openal --enable-opengl --enable-x11grab --enable-libdc1394 --enable-libiec61883 --enable-libzmq --enable-frei0r --enable-libx264 --enable-libopencv
    
  libavutil      54. 31.100 / 54. 31.100
    
  libavcodec     56. 60.100 / 56. 60.100
    
  libavformat    56. 40.101 / 56. 40.101
    
  libavdevice    56.  4.100 / 56.  4.100
    
  libavfilter     5. 40.101 /  5. 40.101
    
  libavresample   2.  1.  0 /  2.  1.  0
    
  libswscale      3.  1.101 /  3.  1.101
    
  libswresample   1.  2.101 /  1.  2.101
    
  libpostproc    53.  3.100 / 53.  3.100
    
Input #0, matroska,webm, from '1472343170-1.webm':
    
  Metadata:
    
    encoder         : Chrome
    
  Duration: N/A, start: 0.000000, bitrate: N/A
    
    Stream #0:0(eng): Video: vp8, yuv420p, 1280x760, SAR 1:1 DAR 32:19, 30 fps, 30 tbr, 1k tbn, 1k tbc (default)

    ffprobe 1472343245-16.webm

    ffprobe version 2.8.6-1ubuntu2 Copyright (c) 2007-2016 the FFmpeg developers
    
  built with gcc 5.3.1 (Ubuntu 5.3.1-11ubuntu1) 20160311
    
  configuration: --prefix=/usr --extra-version=1ubuntu2 --build-suffix=-ffmpeg --toolchain=hardened --libdir=/usr/lib/x86_64-linux-gnu --incdir=/usr/include/x86_64-linux-gnu --cc=cc --cxx=g++ --enable-gpl --enable-shared --disable-stripping --disable-decoder=libopenjpeg --disable-decoder=libschroedinger --enable-avresample --enable-avisynth --enable-gnutls --enable-ladspa --enable-libass --enable-libbluray --enable-libbs2b --enable-libcaca --enable-libcdio --enable-libflite --enable-libfontconfig --enable-libfreetype --enable-libfribidi --enable-libgme --enable-libgsm --enable-libmodplug --enable-libmp3lame --enable-libopenjpeg --enable-libopus --enable-libpulse --enable-librtmp --enable-libschroedinger --enable-libshine --enable-libsnappy --enable-libsoxr --enable-libspeex --enable-libssh --enable-libtheora --enable-libtwolame --enable-libvorbis --enable-libvpx --enable-libwavpack --enable-libwebp --enable-libx265 --enable-libxvid --enable-libzvbi --enable-openal --enable-opengl --enable-x11grab --enable-libdc1394 --enable-libiec61883 --enable-libzmq --enable-frei0r --enable-libx264 --enable-libopencv
    
  libavutil      54. 31.100 / 54. 31.100
    
  libavcodec     56. 60.100 / 56. 60.100
    
  libavformat    56. 40.101 / 56. 40.101
    
  libavdevice    56.  4.100 / 56.  4.100
    
  libavfilter     5. 40.101 /  5. 40.101
    
  libavresample   2.  1.  0 /  2.  1.  0
    
  libswscale      3.  1.101 /  3.  1.101
    
  libswresample   1.  2.101 /  1.  2.101
    
  libpostproc    53.  3.100 / 53.  3.100
    
Input #0, matroska,webm, from '1472343245-16.webm':
    
  Metadata:
    
    encoder         : Chrome
    
  Duration: N/A, start: 0.000000, bitrate: N/A
    
    Stream #0:0(eng): Video: vp8, yuv420p, 1280x760, SAR 1:1 DAR 32:19, 30 fps, 30 tbr, 1k tbn, 1k tbc (default)

    ffprobe 1472343350-37.webm

    ffprobe version 2.8.6-1ubuntu2 Copyright (c) 2007-2016 the FFmpeg developers
    
  built with gcc 5.3.1 (Ubuntu 5.3.1-11ubuntu1) 20160311
    
  configuration: --prefix=/usr --extra-version=1ubuntu2 --build-suffix=-ffmpeg --toolchain=hardened --libdir=/usr/lib/x86_64-linux-gnu --incdir=/usr/include/x86_64-linux-gnu --cc=cc --cxx=g++ --enable-gpl --enable-shared --disable-stripping --disable-decoder=libopenjpeg --disable-decoder=libschroedinger --enable-avresample --enable-avisynth --enable-gnutls --enable-ladspa --enable-libass --enable-libbluray --enable-libbs2b --enable-libcaca --enable-libcdio --enable-libflite --enable-libfontconfig --enable-libfreetype --enable-libfribidi --enable-libgme --enable-libgsm --enable-libmodplug --enable-libmp3lame --enable-libopenjpeg --enable-libopus --enable-libpulse --enable-librtmp --enable-libschroedinger --enable-libshine --enable-libsnappy --enable-libsoxr --enable-libspeex --enable-libssh --enable-libtheora --enable-libtwolame --enable-libvorbis --enable-libvpx --enable-libwavpack --enable-libwebp --enable-libx265 --enable-libxvid --enable-libzvbi --enable-openal --enable-opengl --enable-x11grab --enable-libdc1394 --enable-libiec61883 --enable-libzmq --enable-frei0r --enable-libx264 --enable-libopencv
    
  libavutil      54. 31.100 / 54. 31.100
    
  libavcodec     56. 60.100 / 56. 60.100
    
  libavformat    56. 40.101 / 56. 40.101
    
  libavdevice    56.  4.100 / 56.  4.100
    
  libavfilter     5. 40.101 /  5. 40.101
    
  libavresample   2.  1.  0 /  2.  1.  0
    
  libswscale      3.  1.101 /  3.  1.101
    
  libswresample   1.  2.101 /  1.  2.101
    
  libpostproc    53.  3.100 / 53.  3.100
    
Input #0, matroska,webm, from '1472343350-37.webm':
    
  Metadata:
    
    encoder         : Chrome
    
  Duration: N/A, start: 0.000000, bitrate: N/A
    
    Stream #0:0(eng): Video: vp8, yuv420p, 1280x760, SAR 1:1 DAR 32:19, 30 fps, 30 tbr, 1k tbn, 1k tbc (default)

    I also noticed that the merged video plays normal when the mouse is moving around on the screen, but when the mouse is not moving, it moves 5x faster.

    I know this because I have a timer on the screen that I’m recording, and I can see that the timer speeds up significantly when mouse isn’t moving but when mouse is moving, the timer moves at normal speed.

    EDIT3 :
    The DTS/PTS looks like resets after each file is merged :

    DTS -9223363446915256, next:6866667 st:0 invalid dropping
    
PTS -9223363446915256, next:6866667 invalid dropping st:0
    
DTS -9223363446915222, next:6900000 st:0 invalid dropping
    
PTS -9223363446915222, next:6900000 invalid dropping st:0
    
DTS -9223363446915188, next:6933333 st:0 invalid dropping
    
PTS -9223363446915188, next:6933333 invalid dropping st:0
    
[concat @ 0x1cde3e0] DTS -9223363446920184 < 5006 out of order
    
DTS -9223363446920184, next:5033333 st:0 invalid dropping
    
PTS -9223363446920184, next:5033333 invalid dropping st:0
    
DTS -9223363446920056, next:5066667 st:0 invalid dropping
    
PTS -9223363446920056, next:5066667 invalid dropping st:0
    
DTS -9223363446919956, next:5100000 st:0 invalid dropping
    
PTS -9223363446919956, next:5100000 invalid dropping st:0

    EDIT4 : Tried ffmpeg -i "$f" -y -c copy -fflags +genpts "$f" and then merge again.

    Works a lot better, but now other files are getting skipped.

    Here’s ffprobe from a file that’s skipped :

    Metadata:
    
    encoder         : Lavf56.40.101
    
  Duration: 00:00:01.17, start: 0.000000, bitrate: 428 kb/s
    
    Stream #0:0(eng): Video: vp8, yuv420p, 1280x760, SAR 1:1 DAR 32:19, 30 fps, 30 tbr, 1k tbn, 1k tbc (default)
    
[webm @ 0x1c01940] Codec for stream 0 does not use global headers but container format requires global headers
    
Output #0, webm, to '1472343225-12.webm':
    
  Metadata:
    
    encoder         : Lavf56.40.101
    
    Stream #0:0(eng): Video: vp8, yuv420p, 1280x760 [SAR 1:1 DAR 32:19], q=2-31, 30 fps, 30 tbr, 1k tbn, 1k tbc (default)
    
Stream mapping:
    
  Stream #0:0 -> #0:0 (copy)

    Here’s ffprobe from a file not skipped :

    Input #0, matroska,webm, from '1472343215-10.webm':
    
  Metadata:
    
    encoder         : Lavf56.40.101
    
  Duration: 00:00:05.03, start: 0.000000, bitrate: 80 kb/s
    
    Stream #0:0(eng): Video: vp8, yuv420p, 1280x760, SAR 1:1 DAR 32:19, 30 fps, 30 tbr, 1k tbn, 1k tbc (default)
    
[webm @ 0x1349940] Codec for stream 0 does not use global headers but container format requires global headers
    
Output #0, webm, to '1472343215-10.webm':
    
  Metadata:
    
    encoder         : Lavf56.40.101
    
    Stream #0:0(eng): Video: vp8, yuv420p, 1280x760 [SAR 1:1 DAR 32:19], q=2-31, 30 fps, 30 tbr, 1k tbn, 1k tbc (default)
    
Stream mapping:
    
  Stream #0:0 -> #0:0 (copy)

  • rtmp : Allocate the prev_pkt arrays dynamically

    11 octobre 2013, par Martin Storsjö
    rtmp : Allocate the prev_pkt arrays dynamically

    Normally, all channel ids are between 0 and 10, while they in
    
uncommon cases can have values up to 64k.
    

    This avoids allocating two arrays for up to 64k entries (at a total
    
of over 6 MB in size) each when most of them aren’t used at all.
    

    Signed-off-by : Martin Storsjö <martin@martin.st>
    • [DH] libavformat/rtmppkt.c
    • [DH] libavformat/rtmppkt.h
    • [DH] libavformat/rtmpproto.c

  • rtmp : Allocate the prev_pkt arrays dynamically

    11 octobre 2013, par Martin Storsjö
    rtmp : Allocate the prev_pkt arrays dynamically

    Normally, all channel ids are between 0 and 10, while they in
    
uncommon cases can have values up to 64k.
    

    This avoids allocating two arrays for up to 64k entries (at a total
    
of over 6 MB in size) each when most of them aren’t used at all.
    

    Signed-off-by : Martin Storsjö <martin@martin.st>
    • [DBH] libavformat/rtmppkt.c
    • [DBH] libavformat/rtmppkt.h
    • [DBH] libavformat/rtmpproto.c

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