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  • How to pipe sequence of thumbnails/screenshots from ffmpeg to nodejs for further processing ?

    30 décembre 2015, par Dmitry Ivanov

    What I want to achieve is to take screenshots continuously and pass them to nodejs application in order to process each one separately and do some other stuff. I need this for Linux environment only. I picked ffmpeg with x11grab as a screenshots provider. The following command works just fine :

    ffmpeg -t 10 -s 1366x768 -f x11grab -i :0.0+0,0 -vf fps=30 output_%d.png -y

    It creates 300 consequent frames of my screen during 10 seconds period. Then I want to redirect the output to my nodejs app rather than just to write files on the hard drive. So I’m calling ffmpeg from node :

    var spawn = require('child_process').spawn,
    
    fps = 30,
    
    duration = 10,
    
    screenSize = {w: 1366, h: 768},
    
    args = [
    
        '-t', 
    
        duration, 
    
        '-s', 
    
        screenSize.w + 'x' + screenSize.h, 
    
        '-f', 
    
        'x11grab', 
    
        '-i', 
    
        ':0.0', 
    
        '-vf',
    
        'fps=' + fps,
    
        '-f',
    
        'mjpeg',
    
        'pipe:1'
    
    ],
    
    ff = spawn('ffmpeg', args);
    

    
ff.stdout.on('data', function (data) {
    
    console.log('Data size: ' + data.length);
    
});
    

    
ff.stdout.on('end', function (data) {
    
    console.log('Stream end');
    
});
    

    
ff.stderr.on('data', function (data) {
    
    console.log('ff error: ' + data);
    
});

    I apologize for a long log, but it’s important :

    ff error: ffmpeg version N-77455-g4707497 Copyright (c) 2000-2015 the FFmpeg developers
    
  built with gcc 4.8 (Ubuntu 4.8.4-2ubuntu1~14.04)
    
  configuration: --extra-libs=-ldl --prefix=/opt/ffmpeg --mandir=/usr/share/man --enable-avresample --disable-debug --enable-nonfree --enable-gpl --enable-version3 --enable-libopencore-amrnb --enable-libopencore-amrwb --disable-decoder=amrnb --disable-decoder=amrwb --enable-libpulse --enable-libdcadec --enable-libfreetype --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      55. 11.100 / 55. 11.100
    
  libavcodec     57. 20.100 / 57. 20.100
    
  libavformat    57. 20.100 / 57. 20.100
    
  libavdevice    57.  0.100 / 57.  0.100
    
  libavfilter     6. 21.101 /  6. 21.101
    
  libavresample   3.  0.  0 /  3.  0.  0
    
  libswscale      4.  0.100 /  4.  0.100
    
  libswresample   2.  0.101 /  2.  0.101
    
  libpostproc    54.  0.100 / 54.  0.100
    

    
ff error: Input #0, x11grab, from ':0.0':
    
  Duration: N/A, start: 1451414448.216650, bitrate: N/A
    
    Stream #0:0: Video: rawvideo (BGR[0] / 0x524742), bgr0, 1366x768, 29.97 fps, 29.97 tbr, 1000k tbn, 
    
ff error: 29.97 tbc
    

    
ff error: [swscaler @ 0x34238a0] deprecated pixel format used, make sure you did set range correctly
    

    
ff error: Output #0, mjpeg, to 'pipe:1':
    
  Metadata:
    
    encoder         : 
    
ff error: Lavf57.20.100
    
    Stream #0:0: Video: mjpeg, yuvj444p(pc), 1366x768, q=2-31, 200 kb/s, 30 fps, 30 tbn, 30 tbc
    
    Metadata:
    
      encoder         : Lavc57.20.100 mjpeg
    
    Side data:
    
      unknown side data type 10 (24 bytes)
    
Stream mapping:
    
  Stream #0:0 -> #0:0 (rawvideo (native) -> mjpeg (native))
    
Press [q] to stop, [?] for help
    

    
ff error: [swscaler @ 0x34238a0] Warning: data is not aligned! This can lead to a speedloss
    

    
Data size: 65536
    
Data size: 65536
    
Data size: 21413
    
Data size: 65536
    
Data size: 65536
    
Data size: 45581
    
Data size: 65536
    
Data size: 65536
    
Data size: 62377
    
Data size: 65536
    
Data size: 65536
    
Data size: 45581
    
Data size: 65536
    
Data size: 65536
    
Data size: 21413
    
Data size: 65536
    
Data size: 60933
    
Data size: 65536
    
Data size: 49550
    
Data size: 65536
    
Data size: 36709
    
Data size: 65536
    
Data size: 27035
    
Data size: 65536
    
Data size: 20131
    
Data size: 65536
    
Data size: 15887
    
Data size: 65536
    
Data size: 15887
    
Data size: 65536
    
Data size: 15887
    
Data size: 65536
    
Data size: 15911
    
Data size: 65536
    
Data size: 15911
    
Data size: 65536
    
Data size: 15911
    
ff error: frame=   16 fps=0.0 q=24.8 size=    1819kB time=00:00:00.53 bitrate=27935.6kbits/s speed=1.04x    
    
Data size: 65536
    
Data size: 15911
    
Data size: 65536
    
Data size: 15911
    
Data size: 65536
    
Data size: 15919
    
Data size: 65536
    
Data size: 15919
    
Data size: 65536
    
Data size: 15919
    
Data size: 65536
    
Data size: 15919
    
Data size: 65536
    
Data size: 15919
    
Data size: 65536
    
Data size: 15911
    
Data size: 65536
    
Data size: 15911
    
Data size: 65536
    
Data size: 15906
    
Data size: 65536
    
Data size: 15906
    
Data size: 65536
    
Data size: 15917
    
Data size: 65536
    
Data size: 15999
    
Data size: 65536
    
Data size: 15949
    
Data size: 65536
    
Data size: 15997
    
Data size: 65536
    
Data size: 15965
    
ff error: frame=   32 fps= 30 q=24.8 size=    3092kB time=00:00:01.06 bitrate=23743.7kbits/s speed=1.01x    
    
Data size: 65536
    
Data size: 16025
    
Data size: 65536
    
Data size: 15978
    
Data size: 65536
    
Data size: 15963
    
Data size: 65536
    
Data size: 16028
    
Data size: 65536
    
Data size: 15976
    
Data size: 65536
    
Data size: 15958
    
Data size: 65536
    
Data size: 15940
    
Data size: 65536
    
Data size: 15992
    
Data size: 65536
    
Data size: 15962
    
Data size: 65536
    
Data size: 16010
    
Data size: 65536
    
Data size: 15941
    
Data size: 65536
    
Data size: 15941
    
Data size: 65536
    
Data size: 15973
    
Data size: 65536
    
Data size: 15943
    
Data size: 65536
    
Data size: 15947
    
Data size: 65536
    
Data size: 15947
    
ff error: frame=   48 fps= 30 q=24.8 size=    4365kB time=00:00:01.60 bitrate=22349.6kbits/s speed=1.01x    
    
Data size: 65536
    
Data size: 15982
    
Data size: 65536
    
Data size: 15982
    
Data size: 65536
    
Data size: 15956
    
Data size: 65536
    
Data size: 15956
    
Data size: 65536
    
Data size: 15956
    
Data size: 65536
    
Data size: 16001
    
Data size: 65536
    
Data size: 15930
    
Data size: 65536
    
Data size: 15922
    
Data size: 65536
    
Data size: 15924
    
Data size: 65536
    
Data size: 15924
    
Data size: 65536
    
Data size: 15924
    
Data size: 65536
    
Data size: 15924
    
Data size: 65536
    
Data size: 15911
    
Data size: 65536
    
Data size: 15924
    
Data size: 65536
    
Data size: 15985
    
Data size: 65536
    
Data size: 15985
    
ff error: frame=   64 fps= 30 q=24.8 size=    5638kB time=00:00:02.13 bitrate=21651.3kbits/s speed=1.01x    
    
Data size: 65536
    
Data size: 15985
    
Data size: 65536
    
Data size: 15924
    
Data size: 65536
    
Data size: 15976
    
Data size: 65536
    
Data size: 15976
    
Data size: 65536
    
Data size: 15958
    
Data size: 65536
    
Data size: 16319
    
Data size: 65536
    
Data size: 16558
    
Data size: 65536
    
Data size: 16576
    
Data size: 65536
    
Data size: 16564
    
Data size: 65536
    
Data size: 16582
    
Data size: 65536
    
Data size: 16589
    
Data size: 65536
    
Data size: 16587
    
Data size: 65536
    
Data size: 16446
    
Data size: 65536
    
Data size: 16450
    
Data size: 65536
    
Data size: 16450
    
Data size: 65536
    
Data size: 16450
    
ff error: frame=   80 fps= 30 q=24.8 size=    6918kB time=00:00:02.66 bitrate=21251.0kbits/s speed=1.01x    
    
Data size: 65536
    
Data size: 16568
    
Data size: 65536
    
Data size: 16575
    
Data size: 65536
    
Data size: 16585
    
Data size: 65536
    
Data size: 18182
    
Data size: 65536
    
Data size: 17203
    
Data size: 65536
    
Data size: 16769
    
Data size: 65536
    
Data size: 16734
    
Data size: 65536
    
Data size: 16823
    
Data size: 65536
    
Data size: 16338
    
Data size: 65536
    
Data size: 16455
    
Data size: 65536
    
Data size: 16406
    
Data size: 65536
    
Data size: 16645
    
Data size: 65536
    
Data size: 16800
    
Data size: 65536
    
Data size: 16800
    
Data size: 65536
    
Data size: 16800
    
Data size: 65536
    
Data size: 16806
    
ff error: frame=   96 fps= 30 q=24.8 size=    8204kB time=00:00:03.20 bitrate=21001.8kbits/s speed=   1x    
    
Data size: 65536
    
Data size: 16795
    
Data size: 65536
    
Data size: 16804
    
Data size: 65536
    
Data size: 16770
    
Data size: 65536
    
Data size: 16760
    
Data size: 65536
    
Data size: 16813
    
Data size: 65536
    
Data size: 16445
    
Data size: 65536
    
Data size: 16259
    
Data size: 65536
    
Data size: 16260
    
Data size: 65536
    
Data size: 16265
    
Data size: 65536
    
Data size: 16284
    
Data size: 65536
    
Data size: 16233
    
Data size: 65536
    
Data size: 16233
    
Data size: 65536
    
Data size: 16182
    
Data size: 65536
    
Data size: 16058
    
Data size: 60561
    
ff error: frame=  111 fps= 30 q=24.8 size=    9384kB time=00:00:03.70 bitrate=20776.1kbits/s speed=   1x    
    
Data size: 61813
    
Data size: 61813
    
Data size: 61813
    
Data size: 61813
    
Data size: 61813
    
Data size: 61781
    
Data size: 61784
    
Data size: 61796
    
Data size: 61842
    
Data size: 61839
    
Data size: 61793
    
Data size: 61810
    
Data size: 61844
    
Data size: 61844
    
Data size: 61850
    
Data size: 61841
    
ff error: frame=  127 fps= 30 q=24.8 size=   10350kB time=00:00:04.23 bitrate=20027.8kbits/s speed=   1x    
    
Data size: 61858
    
Data size: 61853
    
Data size: 61833
    
Data size: 61867
    
Data size: 61867
    
Data size: 61867
    
Data size: 61867
    
Data size: 61867
    
Data size: 61867
    
Data size: 61867
    
Data size: 61867
    
Data size: 61867
    
Data size: 61867
    
Data size: 61867
    
Data size: 61867
    
ff error: frame=  142 fps= 30 q=24.8 size=   11256kB time=00:00:04.73 bitrate=19480.5kbits/s speed=   1x    
    
Data size: 61867
    
Data size: 61867
    
Data size: 61867
    
Data size: 61867
    
Data size: 61867
    
Data size: 61867
    
Data size: 61867
    
Data size: 61867
    
Data size: 61867
    
Data size: 61867
    
Data size: 61867
    
Data size: 61867
    
Data size: 61867
    
Data size: 61867
    
Data size: 61867
    
Data size: 61867
    
ff error: frame=  158 fps= 30 q=24.8 size=   12223kB time=00:00:05.26 bitrate=19011.4kbits/s speed=   1x    
    
Data size: 61867
    
Data size: 61867
    
Data size: 61867
    
Data size: 61867
    
Data size: 61867
    
Data size: 61867
    
Data size: 61867
    
Data size: 61867
    
Data size: 61867
    
Data size: 61867
    
Data size: 61850
    
Data size: 61850
    
Data size: 61850
    
Data size: 61850
    
Data size: 61850
    
ff error: frame=  173 fps= 30 q=24.8 size=   13129kB time=00:00:05.76 bitrate=18650.3kbits/s speed=   1x    
    
Data size: 61850
    
Data size: 61850
    
Data size: 61850
    
Data size: 61850
    
Data size: 61850
    
Data size: 61850
    
Data size: 61850
    
Data size: 61850
    
Data size: 61850
    
Data size: 61850
    
Data size: 61850
    
Data size: 61850
    
Data size: 61850
    
Data size: 61850
    
Data size: 61850
    
ff error: frame=  188 fps= 30 q=24.8 size=   14035kB time=00:00:06.26 bitrate=18346.6kbits/s speed=   1x    
    
Data size: 61850
    
Data size: 61850
    
Data size: 61850
    
Data size: 61850
    
Data size: 61850
    
Data size: 61850
    
Data size: 61850
    
Data size: 61850
    
Data size: 61850
    
Data size: 61850
    
Data size: 61850
    
Data size: 61850
    
Data size: 61850
    
Data size: 61850
    
Data size: 61850
    
ff error: frame=  203 fps= 30 q=24.8 size=   14941kB time=00:00:06.76 bitrate=18087.8kbits/s speed=   1x    
    
Data size: 61850
    
Data size: 61850
    
Data size: 61850
    
Data size: 61850
    
Data size: 61850
    
Data size: 61850
    
Data size: 61850
    
Data size: 61850
    
Data size: 61850
    
Data size: 61850
    
Data size: 61850
    
Data size: 61850
    
Data size: 61850
    
Data size: 61850
    
Data size: 61850
    
Data size: 61850
    
ff error: frame=  219 fps= 30 q=24.8 size=   15907kB time=00:00:07.30 bitrate=17850.8kbits/s speed=   1x    
    
Data size: 61850
    
Data size: 61850
    
Data size: 61850
    
Data size: 61850
    
Data size: 61850
    
Data size: 61850
    
Data size: 61850
    
Data size: 61850
    
Data size: 61850
    
Data size: 61850
    
Data size: 61850
    
Data size: 61850
    
Data size: 61850
    
Data size: 61850
    
Data size: 61850
    
ff error: frame=  234 fps= 30 q=24.8 size=   16813kB time=00:00:07.80 bitrate=17658.1kbits/s speed=   1x    
    
Data size: 61850
    
Data size: 61850
    
Data size: 61850
    
Data size: 61850
    
Data size: 61850
    
Data size: 61850
    
Data size: 61850
    
Data size: 61850
    
Data size: 61850
    
Data size: 61850
    
Data size: 61850
    
Data size: 61850
    
Data size: 61850
    
Data size: 61850
    
Data size: 61850
    
Data size: 61850
    
ff error: frame=  250 fps= 30 q=24.8 size=   17780kB time=00:00:08.33 bitrate=17478.0kbits/s speed=   1x    
    
Data size: 61850
    
Data size: 61712
    
Data size: 61712
    
Data size: 61712
    
Data size: 61712
    
Data size: 61712
    
Data size: 61712
    
Data size: 60638
    
Data size: 60638
    
Data size: 60638
    
Data size: 60638
    
Data size: 60638
    
Data size: 60638
    
Data size: 60638
    
Data size: 60638
    
ff error: frame=  265 fps= 30 q=24.8 size=   18675kB time=00:00:08.83 bitrate=17319.4kbits/s speed=   1x    
    
Data size: 60638
    
Data size: 60638
    
Data size: 60638
    
Data size: 60638
    
Data size: 60638
    
Data size: 60638
    
Data size: 60638
    
Data size: 60638
    
Data size: 60638
    
Data size: 60638
    
Data size: 60638
    
Data size: 60638
    
Data size: 60638
    
Data size: 60638
    
Data size: 60638
    
ff error: frame=  280 fps= 30 q=24.8 size=   19563kB time=00:00:09.33 bitrate=17171.2kbits/s speed=   1x    
    
Data size: 60638
    
Data size: 60638
    
Data size: 60638
    
Data size: 60638
    
Data size: 60638
    
Data size: 60638
    
Data size: 60638
    
Data size: 60638
    
Data size: 60638
    
Data size: 60638
    
Data size: 60638
    
Data size: 60638
    
Data size: 60638
    
Data size: 60638
    
Data size: 60638
    
ff error: frame=  295 fps= 30 q=24.8 size=   20452kB time=00:00:09.83 bitrate=17038.0kbits/s speed=   1x    
    
Data size: 60638
    
Data size: 60638
    
Data size: 60638
    
Data size: 60638
    
Data size: 60638
    
ff error: frame=  300 fps= 30 q=24.8 Lsize=   20748kB time=00:00:10.00 bitrate=16996.6kbits/s speed=0.998x    
    
video:20748kB audio:0kB subtitle:0kB other streams:0kB global headers:0kB muxing overhead: 0.000000%
    

    
Stream end

    The error messages are weird too, but not the biggest problem for now, so let’s omit them.

    Looking at all the data coming from ffmpeg I assume that the images are coming as a single stream without any separation. I don’t think that looking into binary data and seeking for certain flag bytes is a good idea to solve the problem and separate the images. The command line I mentioned in the top of the post does separate writes to hard drive that means it produces separate writable streams per each screenshot. And it doesn’t do so for a spawned process from nodejs.

    What am I missing ?

  • FFMPEG extract h264 video (can't see video)

    28 décembre 2015, par Marco Ronchi

    I’m trying to extract a portion of video from another video with FFMPEG. I use this command line :

    ffmpeg -i C:\Temp\test.avi -ss 00:00:30.0 -c copy -t 00:00:10.0 C:\Temp\out.avi

    and this is the output messages :

    ffmpeg version N-77504-gbaf4c48 Copyright (c) 2000-2015 the FFmpeg developers
    
  built with gcc 5.2.0 (GCC)
    
  configuration: --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. 11.100 / 55. 11.100
    
  libavcodec     57. 20.100 / 57. 20.100
    
  libavformat    57. 20.100 / 57. 20.100
    
  libavdevice    57.  0.100 / 57.  0.100
    
  libavfilter     6. 22.100 /  6. 22.100
    
  libswscale      4.  0.100 /  4.  0.100
    
  libswresample   2.  0.101 /  2.  0.101
    
  libpostproc    54.  0.100 / 54.  0.100
    
[h264 @ 0000024bf533c6c0] illegal aspect ratio
    
[h264 @ 0000024bf533c6c0] AVC: nal size 1296048104
    
[h264 @ 0000024bf533c6c0] missing picture in access unit with size 4382
    
[h264 @ 0000024bf533c6c0] illegal reordering_of_pic_nums_idc 13
    
    Last message repeated 18 times
    
Input #0, avi, from 'C:\Temp\test.avi':
    
  Metadata:
    
    encoder         : Lavf56.25.101
    
  Duration: 00:01:51.48, start: 0.000000, bitrate: 864 kb/s
    
    Stream #0:0: Video: h264 (Main) (H264 / 0x34363248), yuv420p, 854x480 [SAR 1:1 DAR 427:240], 719 kb/s, 59.94 fps, 29.97 tbr, 59.94 tbn, 59.94 tbc
    
    Stream #0:1: Audio: aac (LC) ([255][0][0][0] / 0x00FF), 44100 Hz, stereo, fltp, 125 kb/s
    
Output #0, avi, to 'C:\Temp\out.avi':
    
  Metadata:
    
    ISFT            : Lavf57.20.100
    
    Stream #0:0: Video: h264 (H264 / 0x34363248), yuv420p, 854x480 [SAR 1:1 DAR 427:240], q=2-31, 719 kb/s, 59.94 fps, 29.97 tbr, 59.94 tbn, 59.94 tbc
    
    Stream #0:1: Audio: aac ([255][0][0][0] / 0x00FF), 44100 Hz, stereo, 125 kb/s
    
Stream mapping:
    
  Stream #0:0 -> #0:0 (copy)
    
  Stream #0:1 -> #0:1 (copy)
    
Press [q] to stop, [?] for help
    
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frame=    0 fps=0.0 q=-1.0 size=      10kB time=00:00:02.02 bitrate=  39.7kbits/[NULL @ 0000024bf533c6c0] illegal reordering_of_pic_nums_idc 13
    
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frame=    0 fps=0.0 q=-1.0 Lsize=      43kB time=00:00:02.02 bitrate= 173.8kbits/s speed= 0.6x
    
video:0kB audio:31kB subtitle:0kB other streams:0kB global headers:0kB muxing overhead: 38.359665%

    The audio was extracted correctly, but I can’t see video (it’s all black). Can someone help me ?

    Thanks in advance

  • Video frame difference with FFMPEG

    27 décembre 2015, par StepTNT

    I need to compute the frame differences between a source video and a compressed one.
    For now I’m using OpenCV with Java, by extracting each frame and doing a simple difference, but it’s quite slow (working a 0.5 fps, meaning that a 500 frames video will take more than 15 mins) so I was thinking to move to FFMPEG.

    FFMPEG feels a lot faster (everything’s done under 1 minute) but it has one big issue that makes the results useless : when compressing the source file, done with FFMPEG too, an extra gray frame is added at the beginning and this fakes the results because different frames are compared.

    This is what I’m doing now (knowing that the extra frame messes it all) :

    ffmpeg -y -i src.avi -i compressed.avi -filter_complex "blend=all_mode=difference,hue=s=0" -c:v libx264 -crf 18 -c:a copy difference.avi

    To fix the frame issue I was trying to remove the first frame by re-encoding the compressed video with this command

    ffmpeg -y -ss 0.02 -i compressed.mpg -an -f mpeg2video compressed-cut.mpg"

    (Note that -ss is 0.02 because it’s a 50 fps video, so I did 1/FPS as suggested here)

    But I get this response

    Output file is empty, nothing was encoded (check -ss / -t / -frames parameters if used)

    So, finally, the question is : since extracting all the frames and then compute differences with OpenCV is really slow, how can I use FFMPEG to produce a video containing the difference between two sources while keeping in mind that one of them has an extra frame at the beginning ?

    EDIT : I wanted to avoid posting endless console outputs but since you asked for it, here we go.

    1) Encoding

    Input

    ffmpeg -i "720p50_mobcal_ter.avi" -an -f mpeg2video -y "720p50_mobcal_ter.mpg"

    Output

    ffmpeg version N-76684-g1fe82ab Copyright (c) 2000-2015 the FFmpeg developers
    
  built with gcc 5.2.0 (GCC)
    
  configuration: --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.  6.100 / 55.  6.100
    
  libavcodec     57. 15.100 / 57. 15.100
    
  libavformat    57. 14.100 / 57. 14.100
    
  libavdevice    57.  0.100 / 57.  0.100
    
  libavfilter     6. 15.100 /  6. 15.100
    
  libswscale      4.  0.100 /  4.  0.100
    
  libswresample   2.  0.101 /  2.  0.101
    
  libpostproc    54.  0.100 / 54.  0.100
    
Input #0, avi, from '720p50_mobcal_ter.avi':
    
  Metadata:
    
    encoder         : Lavf57.14.100
    
  Duration: 00:00:10.08, start: 0.000000, bitrate: 552974 kb/s
    
    Stream #0:0: Video: rawvideo (I420 / 0x30323449), yuv420p, 1280x720, 554059 kb/s, SAR 1:1 DAR 16:9, 50 fps, 50 tbr, 50 tbn, 50 tbc
    
Output #0, mpeg2video, to '720p50_mobcal_ter.mpg':
    
  Metadata:
    
    encoder         : Lavf57.14.100
    
    Stream #0:0: Video: mpeg2video, yuv420p, 1280x720 [SAR 1:1 DAR 16:9], q=2-31, 200 kb/s, 50 fps, 50 tbn, 50 tbc
    
    Metadata:
    
      encoder         : Lavc57.15.100 mpeg2video
    
Stream mapping:
    
  Stream #0:0 -> #0:0 (rawvideo (native) -> mpeg2video (native))
    
Press [q] to stop, [?] for help
    
frame=   41 fps=0.0 q=31.0 size=     984kB time=00:00:00.78 bitrate=10330.5kbits/frame=   80 fps= 78 q=31.0 size=    1323kB time=00:00:01.56 bitrate=6948.1kbits/frame=  124 fps= 80 q=31.0 size=    1725kB time=00:00:02.44 bitrate=5790.0kbits/frame=  168 fps= 81 q=31.0 size=    2084kB time=00:00:03.32 bitrate=5142.8kbits/frame=  212 fps= 81 q=31.0 size=    2482kB time=00:00:04.20 bitrate=4841.4kbits/frame=  255 fps= 82 q=31.0 size=    2840kB time=00:00:05.06 bitrate=4597.2kbits/frame=  296 fps= 82 q=31.0 size=    3133kB time=00:00:05.88 bitrate=4364.5kbits/frame=  338 fps= 82 q=24.8 size=    3453kB time=00:00:06.72 bitrate=4209.2kbits/frame=  382 fps= 82 q=31.0 size=    3723kB time=00:00:07.60 bitrate=4013.4kbits/frame=  426 fps= 83 q=31.0 size=    4005kB time=00:00:08.48 bitrate=3869.1kbits/frame=  470 fps= 83 q=24.8 size=    4276kB time=00:00:09.36 bitrate=3742.5kbits/frame=  504 fps= 83 q=31.0 Lsize=    4469kB time=00:00:10.06 bitrate=3639.3kbits/s
    
video:4469kB audio:0kB subtitle:0kB other streams:0kB global headers:0kB muxing overhead: 0.000000%

    This adds the extra grey frame at the beginning, it just duplicates the first one

    2) Removing first frame

    Input

    ffmpeg -y -i "720p50_mobcal_ter.mpg" -an -f mpeg2video -vf select=gte(n\,1) "CUT-720p50_mobcal_ter.mpg"

    Output

    ffmpeg version N-76684-g1fe82ab Copyright (c) 2000-2015 the FFmpeg developers
    
  built with gcc 5.2.0 (GCC)
    
  configuration: --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.  6.100 / 55.  6.100
    
  libavcodec     57. 15.100 / 57. 15.100
    
  libavformat    57. 14.100 / 57. 14.100
    
  libavdevice    57.  0.100 / 57.  0.100
    
  libavfilter     6. 15.100 /  6. 15.100
    
  libswscale      4.  0.100 /  4.  0.100
    
  libswresample   2.  0.101 /  2.  0.101
    
  libpostproc    54.  0.100 / 54.  0.100
    
Input #0, mpegvideo, from '720p50_mobcal_ter.mpg':
    
  Duration: N/A, bitrate: N/A
    
    Stream #0:0: Video: mpeg2video (Main), yuv420p(tv), 1280x720 [SAR 1:1 DAR 16:9], max. 104857 kb/s, 50 fps, 50 tbr, 1200k tbn, 100 tbc
    
Output #0, mpeg2video, to 'CUT-720p50_mobcal_ter.mpg':
    
  Metadata:
    
    encoder         : Lavf57.14.100
    
    Stream #0:0: Video: mpeg2video, yuv420p, 1280x720 [SAR 1:1 DAR 16:9], q=2-31, 200 kb/s, 50 fps, 50 tbn, 50 tbc
    
    Metadata:
    
      encoder         : Lavc57.15.100 mpeg2video
    
Stream mapping:
    
  Stream #0:0 -> #0:0 (mpeg2video (native) -> mpeg2video (native))
    
Press [q] to stop, [?] for help
    
frame=  255 fps=0.0 q=31.0 size=    2781kB time=00:00:05.10 bitrate=4467.3kbits/frame=  503 fps=0.0 q=31.0 Lsize=    4415kB time=00:00:10.08 bitrate=3588.5kbits/s
    
video:4415kB audio:0kB subtitle:0kB other streams:0kB global headers:0kB muxing overhead: 0.000000%

    3) Frame difference

    Input

    ffmpeg -y -i "720p50_mobcal_ter.avi" -i "CUT-720p50_mobcal_ter.mpg" -filter_complex "blend=all_mode=difference,hue=s=0" -c:v libx264 -crf 18 -c:a copy "DIFF-720p50_mobcal_ter.mpg"

    Output

    ffmpeg version N-76684-g1fe82ab Copyright (c) 2000-2015 the FFmpeg developers
    
  built with gcc 5.2.0 (GCC)
    
  configuration: --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.  6.100 / 55.  6.100
    
  libavcodec     57. 15.100 / 57. 15.100
    
  libavformat    57. 14.100 / 57. 14.100
    
  libavdevice    57.  0.100 / 57.  0.100
    
  libavfilter     6. 15.100 /  6. 15.100
    
  libswscale      4.  0.100 /  4.  0.100
    
  libswresample   2.  0.101 /  2.  0.101
    
  libpostproc    54.  0.100 / 54.  0.100
    
Input #0, avi, from '720p50_mobcal_ter.avi':
    
  Metadata:
    
    encoder         : Lavf57.14.100
    
  Duration: 00:00:10.08, start: 0.000000, bitrate: 552974 kb/s
    
    Stream #0:0: Video: rawvideo (I420 / 0x30323449), yuv420p, 1280x720, 554059 kb/s, SAR 1:1 DAR 16:9, 50 fps, 50 tbr, 50 tbn, 50 tbc
    
Input #1, mpegvideo, from 'CUT-720p50_mobcal_ter.mpg':
    
  Duration: N/A, bitrate: N/A
    
    Stream #1:0: Video: mpeg2video (Main), yuv420p(tv), 1280x720 [SAR 1:1 DAR 16:9], max. 104857 kb/s, 50 fps, 50 tbr, 1200k tbn, 100 tbc
    
[libx264 @ 000002784dbeb980] using SAR=1/1
    
[libx264 @ 000002784dbeb980] using cpu capabilities: MMX2 SSE2Fast SSSE3 SSE4.2 AVX FMA3 AVX2 LZCNT BMI2
    
[libx264 @ 000002784dbeb980] profile High, level 3.2
    
[mpeg @ 000002784dbeaf20] VBV buffer size not set, using default size of 130KB
    
If you want the mpeg file to be compliant to some specification
    
Like DVD, VCD or others, make sure you set the correct buffer size
    
Output #0, mpeg, to 'D:\DOWNLOADS\TMP\Video TDI\AVI\DIFF-720p50_mobcal_ter.mpg':
    
  Metadata:
    
    encoder         : Lavf57.14.100
    
    Stream #0:0: Video: h264 (libx264), yuv420p, 1280x720 [SAR 1:1 DAR 16:9], q=-1--1, 50 fps, 90k tbn, 50 tbc (default)
    
    Metadata:
    
      encoder         : Lavc57.15.100 libx264
    
Stream mapping:
    
  Stream #0:0 (rawvideo) -> blend:top
    
  Stream #1:0 (mpeg2video) -> blend:bottom
    
  hue -> Stream #0:0 (libx264)
    
Press [q] to stop, [?] for help
    
frame=  504 fps= 39 q=-1.0 Lsize=   32182kB time=00:00:10.04 bitrate=26258.5kbits/s
    
video:32061kB audio:0kB subtitle:0kB other streams:0kB global headers:0kB muxing overhead: 0.377054%
    
[libx264 @ 000002784dbeb980] frame I:30    Avg QP:19.69  size:149974
    
[libx264 @ 000002784dbeb980] frame P:299   Avg QP:23.28  size: 69423
    
[libx264 @ 000002784dbeb980] frame B:175   Avg QP:24.48  size: 43280
    
[libx264 @ 000002784dbeb980] consecutive B-frames: 30.6% 69.4%  0.0%  0.0%
    
[libx264 @ 000002784dbeb980] mb I  I16..4: 18.3% 51.4% 30.4%
    
[libx264 @ 000002784dbeb980] mb P  I16..4:  0.6%  5.6%  2.4%  P16..4: 35.9% 22.9% 15.6%  0.0%  0.0%    skip:17.0%
    
[libx264 @ 000002784dbeb980] mb B  I16..4:  0.2%  0.5%  0.3%  B16..8: 49.5% 12.4%  5.6%  direct:15.5%  skip:16.1%  L0:47.8% L1:42.1% BI:10.1%
    
[libx264 @ 000002784dbeb980] 8x8 transform intra:57.5% inter:38.5%
    
[libx264 @ 000002784dbeb980] coded y,uvDC,uvAC intra: 90.7% 0.0% 0.0% inter: 50.3% 0.0% 0.0%
    
[libx264 @ 000002784dbeb980] i16 v,h,dc,p: 32% 23% 35% 10%
    
[libx264 @ 000002784dbeb980] i8 v,h,dc,ddl,ddr,vr,hd,vl,hu: 11% 11% 41%  7%  5%  6%  5%  6%  8%
    
[libx264 @ 000002784dbeb980] i4 v,h,dc,ddl,ddr,vr,hd,vl,hu: 18% 14% 23%  8%  7%  7%  7%  7%  8%
    
[libx264 @ 000002784dbeb980] i8c dc,h,v,p: 100%  0%  0%  0%
    
[libx264 @ 000002784dbeb980] Weighted P-Frames: Y:33.8% UV:0.0%
    
[libx264 @ 000002784dbeb980] ref P L0: 58.1% 16.3% 14.2%  9.4%  2.0%
    
[libx264 @ 000002784dbeb980] ref B L0: 79.3% 20.7%
    
[libx264 @ 000002784dbeb980] kb/s:26056.02

    The second command made everything work while the second one in the first part didn’t (the one with the -ss option), so I could be quite happy about it but I’m not that sure if FFMPEG duplicates the first frame for every video or if it’s just related to the one I’m using now, so it could be better to start off with a compressed video that has the same frame count of the original one.

    So let’s get to one final question : why does FFMPEG add a duplicated first frame at the beginning of the compressed video and how can I avoid that ?

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