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Sur d’autres sites (6852)

  • Why does recoding video with FFMPEG on Windows always give an error ?

    13 février 2016, par ALexF

    I downloaded ffmpeg from http://ramiro.arrozcru.org/ffmpeg-vfwcap-noflip.7z
    and run it with the command line : ffmpeg -r 25 -f vfwcap -i 0 output.avi

    but always get the error :

    ffmpeg -r 25 -f vfwcap -i 0 output.avi
    FFmpeg version SVN-r22915, Copyright (c) 2000-2010 the FFmpeg developers
    built on Apr 20 2010 00:09:08 with gcc 4.4.2
    configuration : —enable-memalign-hack —cross-prefix=i686-mingw32- —cc=ccach
    -i686-mingw32-gcc —arch=i686 —target-os=mingw32 —enable-gpl —enable-libx264
    —enable-pthreads
    libavutil 50.14. 0 / 50.14. 0
    libavcodec 52.66. 0 / 52.66. 0
    libavformat 52.61. 0 / 52.61. 0
    libavdevice 52. 2. 0 / 52. 2. 0
    libswscale 0.10. 0 / 0.10. 0
    [vfwcap @ 012eba60]Could not connect to device.
    0 : Error number -19 occurred

    Why doesn’t this work ?

  • Why Recode Video FFMPEG on windows Allway Error ?

    9 janvier 2012, par ALexF

    i download ffmpeg in : http://ramiro.arrozcru.org/ffmpeg-vfwcap-noflip.7z

    and run it with commanline : ffmpeg -r 25 -f vfwcap -i 0 output.avi

    but allway error is

    ffmpeg -r 25 -f vfwcap -i 0 output.avi
    FFmpeg version SVN-r22915, Copyright (c) 2000-2010 the FFmpeg developers
    built on Apr 20 2010 00:09:08 with gcc 4.4.2
    configuration : —enable-memalign-hack —cross-prefix=i686-mingw32- —cc=ccach
    - i686-mingw32-gcc —arch=i686 —target-os=mingw32 —enable-gpl —enable-libx264
    — enable-pthreads
    libavutil 50.14. 0 / 50.14. 0
    libavcodec 52.66. 0 / 52.66. 0
    libavformat 52.61. 0 / 52.61. 0
    libavdevice 52. 2. 0 / 52. 2. 0
    libswscale 0.10. 0 / 0.10. 0
    [vfwcap @ 012eba60]Could not connect to device.
    0 : Error number -19 occurred

    Link Image :http://nh8.upanh.com/b2.s8.d2/9b09371490590cdabef397ea7705b304_39810848.programmanager20120109110016.png

    why it error, can you fix my commnaline

  • 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 ?

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