[FFmpeg-trac] #977(FFmpeg:new): F4v Cutted output video duration incaccurate, Why?

FFmpeg trac at avcodec.org
Fri Feb 3 23:36:18 CET 2012

#977: F4v Cutted output video duration incaccurate,Why?
             Reporter:               |                     Type:  defect
  overclokkato                       |                 Priority:  critical
               Status:  new          |                  Version:
            Component:  FFmpeg       |  unspecified
             Keywords:               |               Blocked By:
  f4v,cutted,inaccurate duration     |  Reproduced by developer:  0
             Blocking:               |
Analyzed by developer:  0            |
 i'm trying to cut an Adobe postprocessed F4v video (h.264 + mp3) with this
 command :

 ffmpeg -ss 00:10:00 -t 10 -i c:\video.f4v -vcodec copy -acodec copy -f flv
 -async 1 videoout.f4v

 but the output file duration is inaccurate;in my case 12 second and not 10
 second .
 If i try to insert an odd number in -ss (for example -ss 00:10:00) i have
 this issue while an even number the duration is correct.
 Can you help me to resolve this issue ?
 Is the command above right?
 I tried to download last ffmpeg version and compile one version too but
 with the same results,
 Thanks a lot in advance
 Best regards

Ticket URL: <https://ffmpeg.org/trac/ffmpeg/ticket/977>
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