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• Audio output with video processing with opencv

  22 février 2012, par victor1234

  I am processing video with opencv, but at the same time I need to play audio and simply control it, like loud or current frame number.

  I think I should create a parallel process with ffmpeg, but I don't know how to do so. Can you explain what to do ?

  Or do you know another solution ?

• split video (avi/h264) on keyframe

  30 novembre 2012, par m.sr

  Hallo.

  I have a big video file. ffmpeg, tcprobe and other tool say, it is an h264-stream in an AVI-container.

  Now i'd like to cut out small chunks form the video.

  1. Problem : The index of the video seam corrupted/destroyed. I kind of fixed this via mplayer -forceidx -saveidx <indexfile> <bigvideofile></bigvideofile></indexfile>. The Problem here is, that I'm now stuck with mplayer/mencoder which can use this index file via -loadidx <indexfile></indexfile>. I have tried correcting the index like described in man aviindex (mplayer -frames 0 -saveidx mpidx broken.avi ; aviindex -i mpidx -o tcindex ; avimerge -x tcindex -i broken.avi -o fixed.avi), but this didn't fix my video - meaning that most tools i've tested couldn't search in the video file.

  2. Problem : I cut out parts of the video via following command : mencoder -loadidx in.idx -ss 8578 -endpos 20 -oac faac -ovc x264 -sws 9 -lavfopts format=mp4 -x264encopts <lotsofopts> -of lavf -vf scale=800:-10,harddup in.avi -o out.mp4</lotsofopts>. Now here the problem is, that some videos are corrupted at the beginning. I think this is because the fact, that i do not necessarily cut at keyframe.

  Questions :

  1. What is the best way to fix the index of an avi "inline" so that every tool can again work as expected with it ?

  2. How can i split at the keyframes ? Is there an mencoder-option for this ?

  3. Are Keyframes coming in a frequency ? How to find out this frequency ? (So with a bit of math it should be possible to calculate the next keyframe and cut there)

  4. Is ther perhaps some completely other way to split this movie ? Doing it by hand is no option, i've to cut out 1000+ chunks ...

  Thanks a lot !

• ffmpeg trying to remove the first few seconds of video

  21 octobre 2011, par zeroasterisk

  I'm trying to remove a few seconds off the front of a video stream (audio already excluded), and I'm getting strange results : I would think that for every second I increase -ss by, the resulting file would be a second shorter... that doesn't seem to be the case.

  original     ==> 01:04:52.84
  
  -ss 19       ==> 01:04:42.84 (diff = 10) [command history shown below]
  
  -ss 20       ==> 01:04:32.84 (diff = 20) [command history shown below]
  
  -ss 21       ==> 01:04:32.84 (diff = 20)
  
  -ss 25       ==> 01:04:32.84 (diff = 20)
  
  -ss 0:0:25.0 ==> 01:04:32.84 (diff = 20)
  
  -ss 0:0:25.5 ==> 01:04:32.84 (diff = 20) [command history shown below]

  Command : ffmpeg -ss # -i temp.mp4 -y -vcodec copy  temp_croppedFromStart.mp4

  Here's the command history for 19 & 20

  # ffmpeg -ss 19 -i temp.mp4 -y -vcodec copy  temp_croppedFromStart.mp4; ffmpeg -i temp.mp4 2>&1 | grep Duration; ffmpeg -i temp_croppedFromStart.mp4 2>&1 | grep Duration
  
  ffmpeg version N-31809-g9acffed, Copyright (c) 2000-2011 the FFmpeg developers
  
    built on Aug 10 2011 21:25:11 with gcc 4.4.5
  
    configuration: --enable-gpl --enable-version3 --enable-nonfree --enable-postproc --enable-libfaac --enable-libmp3lame --enable-libopencore-amrnb --enable-libopencore-amrwb --enable-libtheora --enable-libvorbis --enable-libvpx --enable-libx264 --enable-libxvid --enable-x11grab
  
    libavutil    51. 11. 1 / 51. 11. 1
  
    libavcodec   53. 10. 0 / 53. 10. 0
  
    libavformat  53.  6. 0 / 53.  6. 0
  
    libavdevice  53.  2. 0 / 53.  2. 0
  
    libavfilter   2. 28. 1 /  2. 28. 1
  
    libswscale    2.  0. 0 /  2.  0. 0
  
    libpostproc  51.  2. 0 / 51.  2. 0
  
  Input #0, mov,mp4,m4a,3gp,3g2,mj2, from 'temp.mp4':
  
    Metadata:
  
      major_brand     : isom
  
      minor_version   : 512
  
      compatible_brands: isomiso2avc1mp41
  
      creation_time   : 1970-01-01 00:00:00
  
      encoder         : Lavf53.6.0
  
    Duration: 01:04:52.84, start: 0.000000, bitrate: 553 kb/s
  
      Stream #0.0(und): Video: h264 (Constrained Baseline), yuv420p, 960x640, 552 kb/s, 25 fps, 25 tbr, 25 tbn, 50 tbc
  
      Metadata:
  
        creation_time   : 1970-01-01 00:00:00
  
  Output #0, mp4, to 'temp_croppedFromStart.mp4':
  
    Metadata:
  
      major_brand     : isom
  
      minor_version   : 512
  
      compatible_brands: isomiso2avc1mp41
  
      creation_time   : 1970-01-01 00:00:00
  
      encoder         : Lavf53.6.0
  
      Stream #0.0(und): Video: libx264, yuv420p, 960x640, q=2-31, 552 kb/s, 25 tbn, 25 tbc
  
      Metadata:
  
        creation_time   : 1970-01-01 00:00:00
  
  Stream mapping:
  
    Stream #0.0 -> #0.0
  
  Press [q] to stop, [?] for help
  
  frame=97071 fps=42523 q=-1.0 Lsize=  262684kB time=01:04:33.84 bitrate= 555.5kbits/s
  
  video:261923kB audio:0kB global headers:0kB muxing overhead 0.290418%
  
    Duration: 01:04:52.84, start: 0.000000, bitrate: 553 kb/s
  
    Duration: 01:04:42.84, start: 0.000000, bitrate: 554 kb/s
  
  
  
  
  
  # ffmpeg -ss 20 -i temp.mp4 -y -vcodec copy  temp_croppedFromStart.mp4; ffmpeg -i temp.mp4 2>&1 | grep Duration; ffmpeg -i temp_croppedFromStart.mp4 2>&1 | grep Duration
  
  ffmpeg version N-31809-g9acffed, Copyright (c) 2000-2011 the FFmpeg developers
  
    built on Aug 10 2011 21:25:11 with gcc 4.4.5
  
    configuration: --enable-gpl --enable-version3 --enable-nonfree --enable-postproc --enable-libfaac --enable-libmp3lame --enable-libopencore-amrnb --enable-libopencore-amrwb --enable-libtheora --enable-libvorbis --enable-libvpx --enable-libx264 --enable-libxvid --enable-x11grab
  
    libavutil    51. 11. 1 / 51. 11. 1
  
    libavcodec   53. 10. 0 / 53. 10. 0
  
    libavformat  53.  6. 0 / 53.  6. 0
  
    libavdevice  53.  2. 0 / 53.  2. 0
  
    libavfilter   2. 28. 1 /  2. 28. 1
  
    libswscale    2.  0. 0 /  2.  0. 0
  
    libpostproc  51.  2. 0 / 51.  2. 0
  
  Input #0, mov,mp4,m4a,3gp,3g2,mj2, from 'temp.mp4':
  
    Metadata:
  
      major_brand     : isom
  
      minor_version   : 512
  
      compatible_brands: isomiso2avc1mp41
  
      creation_time   : 1970-01-01 00:00:00
  
      encoder         : Lavf53.6.0
  
    Duration: 01:04:52.84, start: 0.000000, bitrate: 553 kb/s
  
      Stream #0.0(und): Video: h264 (Constrained Baseline), yuv420p, 960x640, 552 kb/s, 25 fps, 25 tbr, 25 tbn, 50 tbc
  
      Metadata:
  
        creation_time   : 1970-01-01 00:00:00
  
  Output #0, mp4, to 'temp_croppedFromStart.mp4':
  
    Metadata:
  
      major_brand     : isom
  
      minor_version   : 512
  
      compatible_brands: isomiso2avc1mp41
  
      creation_time   : 1970-01-01 00:00:00
  
      encoder         : Lavf53.6.0
  
      Stream #0.0(und): Video: libx264, yuv420p, 960x640, q=2-31, 552 kb/s, 25 tbn, 25 tbc
  
      Metadata:
  
        creation_time   : 1970-01-01 00:00:00
  
  Stream mapping:
  
    Stream #0.0 -> #0.0
  
  Press [q] to stop, [?] for help
  
  frame=96821 fps=47168 q=-1.0 Lsize=  262003kB time=01:04:32.84 bitrate= 554.2kbits/s
  
  video:261244kB audio:0kB global headers:0kB muxing overhead 0.290410%
  
    Duration: 01:04:52.84, start: 0.000000, bitrate: 553 kb/s
  
    Duration: 01:04:32.84, start: 0.000000, bitrate: 554 kb/s
  
  
  
  # ffmpeg -ss 0:0:25.5 -i temp.mp4 -y -vcodec copy  temp_croppedFromStart.mp4; ffmpeg -i temp.mp4 2>&1 | grep Duration; ffmpeg -i temp_croppedFromStart.mp4 2>&1 | grep Duration
  
  ffmpeg version N-31809-g9acffed, Copyright (c) 2000-2011 the FFmpeg developers
  
    built on Aug 10 2011 21:25:11 with gcc 4.4.5
  
    configuration: --enable-gpl --enable-version3 --enable-nonfree --enable-postproc --enable-libfaac --enable-libmp3lame --enable-libopencore-amrnb --enable-libopencore-amrwb --enable-libtheora --enable-libvorbis --enable-libvpx --enable-libx264 --enable-libxvid --enable-x11grab
  
    libavutil    51. 11. 1 / 51. 11. 1
  
    libavcodec   53. 10. 0 / 53. 10. 0
  
    libavformat  53.  6. 0 / 53.  6. 0
  
    libavdevice  53.  2. 0 / 53.  2. 0
  
    libavfilter   2. 28. 1 /  2. 28. 1
  
    libswscale    2.  0. 0 /  2.  0. 0
  
    libpostproc  51.  2. 0 / 51.  2. 0
  
  Input #0, mov,mp4,m4a,3gp,3g2,mj2, from 'temp.mp4':
  
    Metadata:
  
      major_brand     : isom
  
      minor_version   : 512
  
      compatible_brands: isomiso2avc1mp41
  
      creation_time   : 1970-01-01 00:00:00
  
      encoder         : Lavf53.6.0
  
    Duration: 01:04:52.84, start: 0.000000, bitrate: 553 kb/s
  
      Stream #0.0(und): Video: h264 (Constrained Baseline), yuv420p, 960x640, 552 kb/s, 25 fps, 25 tbr, 25 tbn, 50 tbc
  
      Metadata:
  
        creation_time   : 1970-01-01 00:00:00
  
  Output #0, mp4, to 'temp_croppedFromStart.mp4':
  
    Metadata:
  
      major_brand     : isom
  
      minor_version   : 512
  
      compatible_brands: isomiso2avc1mp41
  
      creation_time   : 1970-01-01 00:00:00
  
      encoder         : Lavf53.6.0
  
      Stream #0.0(und): Video: libx264, yuv420p, 960x640, q=2-31, 552 kb/s, 25 tbn, 25 tbc
  
      Metadata:
  
        creation_time   : 1970-01-01 00:00:00
  
  Stream mapping:
  
    Stream #0.0 -> #0.0
  
  Press [q] to stop, [?] for help
  
  frame=96821 fps=45920 q=-1.0 Lsize=  262003kB time=01:04:27.32 bitrate= 555.0kbits/s
  
  video:261244kB audio:0kB global headers:0kB muxing overhead 0.290424%
  
    Duration: 01:04:52.84, start: 0.000000, bitrate: 553 kb/s
  
    Duration: 01:04:32.84, start: 0.000000, bitrate: 554 kb/s