[MPlayer-users] yum4mpeg audio sync broken

"Jürgen Hammelmann" Juergen.Hammelmann at gmx.de
Fri Jan 2 13:03:01 CET 2004

for encoding with yuv4mpeg you have to disable frame dropping in mplayer!!! 
Look at my TOOLS/mencvcd script how to do it. 
Ciao, Jürgen Hammelmann 
> [Automatic answer: RTFM (read DOCS, FAQ), also read DOCS/bugreports.html] 
> I'm writing a script that uses mplayer as a first step in converting 
> movies of various formats to DVDs. However, I'm having various problems 
> with the audio sync, and while reading mplayer.c I came across this 
> code: 
>          } else { 
>              /* 
>              Well, no blitting is needed, but some devices (such as 
> yuv4mpeg) m\ 
> ust output frame 
>              otherwise A/V desync will occur. -- Alvieboy 
>              */ 
>             if (vo_config_count) 
>                 video_out->control(VOCTRL_DUPLICATE_FRAME, NULL); 
>          } 
> As far as I can tell, this code is wrong. Frame dropping is done 
> specifically 
> to *preserve* A/V sync, and the code above prevents that from working. 
> I also noticed that there doesn't seem to be any code that can generate 
> extra frames if the audio should fall behind the video.  The code for 
> this seems to exist in mencoder, but unfortunately mencoder cannot output 
> yuv4mpeg... 
> In my script I currently have a workaround that reads the "ct:" part of 
> the mplayer output and drops frames if ct becomes too large, but it's 
> a really really really ugly workaround. 
>   /Hubbe 
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