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• ffmpeg : videos before and after conversion aren't the same length

  16 juillet 2012, par Koyot

  I have a set of .mov videos which require conversion to .mp4 format. I'm using ffmpeg and running this command :

  ffmpeg -i Banking.mov -vsync -async -sameq -ac 1 -ab 64k -ar 44100 Banking.mp4

  There is a slight difference between input and output video in time length (00:03:35.407 and 00:03:35.582). And here's the catch - I'm storing time cue set at precise times in a file which is used by a program to point at specific scenes. The 0.1 second difference causes it to point at wrong scenes, therefore making the cue set useless. Is there any possibility to preserve exactly the same time in different format ?

     FFmpeg version CVS, Copyright (c) 2000-2004 Fabrice BellardMac OSX universal build for ffmpegX
  
    configuration:  --enable-memalign-hack --enable-mp3lame --enable-gpl --disable-vhook --disable-ffplay --disable-ffserver --enable-a52 --enable-xvid --enable-faac --enable-faad --enable-amr_nb --enable-amr_wb --enable-pthreads --enable-x264 
  
    libavutil version: 49.0.0
  
    libavcodec version: 51.9.0
  
    libavformat version: 50.4.0
  
    built on Apr 15 2006 04:58:19, gcc: 4.0.1 (Apple Computer, Inc. build 5250)
  
  [mov,mp4,m4a,3gp,3g2,mj2 @ 0x5597b8]negative ctts, ignoring
  
  Input #0, mov,mp4,m4a,3gp,3g2,mj2, from 'Banking.mov':
  
    Duration: 00:03:35.6, start: 0.000000, bitrate: 1400 kb/s
  
    Stream #0.0(eng): Audio: pcm_s16be, 24000 Hz, stereo, 768 kb/s
  
    Stream #0.1(eng), 29.97 fps(r): Video: h264, yuv420p, 720x480
  
  Output #0, mp4, to 'Banking.mp4':
  
    Stream #0.0, 29.97 fps(c): Video: mpeg4, yuv420p, 720x480, q=2-31, 200 kb/s
  
    Stream #0.1: Audio: aac, 44100 Hz, mono, 64 kb/s
  
  Stream mapping:
  
    Stream #0.1 -> #0.0
  
    Stream #0.0 -> #0.1
  
  Press [q] to stop encoding
  
  frame= 6461 q=0.0 Lsize=   53181kB time=215.3 bitrate=2023.3kbits/s    
  
  video:51437kB audio:1618kB global headers:0kB muxing overhead 0.237816%