[MPlayer-users] x264 encoding with B-frames ruins A-V sync

[Nico Sabbi]

Miroslav Lichvar wrote:

>Hello,
>
>I'm experiencing a-v sync problems with mencoder when using the x264
>encoder with bframes option.
>
>mencoder -o a.avi -oac copy -ovc x264 -x264encopts \
>	bitrate=1000:bframes=3 a.mpg
>
>generates a file with a-v out of sync and it can be perfectly played
>back with "mplayer -delay -0.12". When I set bframes to 16, the right
>delay value will be about -0.64. Every file I tried had the same
>problem.
>
>I'm using current mplayer, mencoder and x264 compiled with gcc 3.4.4.
>	
>  
>

and 25fps 1 frame lasts 40 msecs, so your delay corresponds to N 
B-frames * frame duration.