[MEncoder-users] a/v sync problems

Jon Drukman jdrukman at gmail.com
Tue Feb 3 02:40:47 CET 2009

Jon Drukman wrote:
  > It is falling down a lot on certain .mov files.  The most recent
> problematic example are videos taken with the "Photo Booth" app on Mac 
> OS.  It seems like the video is actually 15fps, but mplayer identifies 
> it as something totally random.  It plays fine if I just watch the 
> original with mplayer, but converting it usually causes the video to run 
> too fast.

after a little more investigation, i found a tool called "mediainfo" 
which prints more detailed information about the file.  all these files 
have a variable frame rate, it turns out.  using the frame rate as 
reported by mediainfo (i'm guessing it's the average frame rate), i can 
get videos that more-or-less stay in sync.  it's not perfect but it's 
way better than before.  is there some way to tell mencoder to convert 
the variable frame rate input into a constant frame rate output, by 
duplicating/dropping frames as necessary?  i thought -ofps and -vf 
harddup would do that but it doesn't seem to work.

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