[MPlayer-users] v4l a/v sync problem

Steven Adeff adeffs at rpi.edu
Sat Apr 19 19:15:52 CEST 2003

I beleive this is related to the audio sync problem mencoder has with the 
mpeg4/lame combination of encoding, it seems to manifest itself on random 
peoples computers(I'm one, and I'm putting together a bug report now), 
hopefully it will get solved soon.

On Friday 18 April 2003 04:11 pm, Jordan wrote:
> [Automatic answer: RTFM (read DOCS, FAQ), also read DOCS/bugreports.html]
> I have an a/v sync problem when recording with v4l. I have a Hauppauge
> WinTV Radio with stereo sound using the bttv driver. I use btaudio to
> record with this:
> mencoder -tv on:driver=v4l:width=576:height=432 \
> -tv norm=NTSC:chanlist=us-cable:channel=56 \
> -tv forcechan=2:amode=1:audiorate=32000:adevice=/dev/dsp1 -srate 32000 \
> -vop pp=tn/lb,crop=562:432:6:0 -ofps 25 \
> -oac mp3lame -lameopts br=128 -ovc lavc -lavcopts
> vcodec=mpeg4:vbitrate=2000 \ -endpos $TIMER -o
> /home/xero/tmp/video/$1-`date +%b%d-%I.%M`.avi
> At first, everythings fine, then slowly a/v sync starts to go. It's first
> noticable around 4-5 minutes into the file. I tried adding -srate to fix it
> but it doesn't do anything noticable. When I use nvrec the sync is fine
> with btaudio so I don't believe this is a driver problem. If I don't use
> btaudio I don't see this problem.
> Any help would be appreciated.
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Steven Adeff

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