[MPlayer-users] tv mode a/v sync problems (again)

[Santiago Muelas]

I'm using the next line to watch TV and althought not absolutely perfect it is o.k. for me. I include also the lines for recording and with those two I have been able to remove the old video from my TV-set   :-)

First one:
mplayer -vop scale,crop=704:528:8:8,pp=hb/vb/dr/al/lb -ssf cgb=5 cs=10 \ -tv on:driver=v4l:width=720:height=544:channel=$1:outfmt=i420:norm=PAL \ -vc rawi420

Second:
mencoder -ovc lavc -lavcopts vcodec=mpeg4:vhq:vbitrate=1100 -vop\ scale,crop=512:384:8:8,pp=hb/vb/dr/al/lb -ssf cgb=5:cs=10 -oac mp3lame\ -tv on:driver=v4l:width=528:height=400:channel=$1:outfmt=i420:norm=PAL\ -vc rawi420 -o $2.avi
if the programm takes the whole screen the whole TV screen, or

Third
mencoder -ovc lavc -lavcopts vcodec=mpeg4:vhq -vop\ scale,crop=512:288:8:46,pp=hb/vb/dr/al/lb -ssf cgb=5:cs=10 -oac mp3lame\ -tv on:driver=v4l:width=528:height=396:channel=$1:outfmt=i420:norm=PAL\ -vc rawi420 -o $2.avi
if the program is of the type 16:9

Regards


On Mon, 17 Feb 2003 23:23:47 +0100
Giuseppe Ciotta <giuppi at acaro.org> wrote:

> [Automatic answer: RTFM (read DOCS, FAQ), also read DOCS/bugreports.html]
> hi!
> 
> I'm here still trying to get a good a/v sync with the v4l capture
> mode.
> 
> i've asked to several people, and someone on the mplayer channel says
> it's possible to use the btaudio device to capture the audio with this
> command line:
> 
> mplayer -vo xv -fs -tv\
> on:driver=v4l:device=/dev/video:input=0:norm=PAL:channel=E2:\
> chanlist=europe-west:width=640:height=480:outfmt=yuy2:\
> adevice=/dev/dsp2:amode=1:audiorate=32000:forcechan=2 -nocache
> 
> but it doesn't work for me (no audio)
> 
> so i'm trying with the loopback cable, and i have a very bad a/v sync,
> is there a way to force a sync in this situation ? i mean, using the
> loopback cable is there a way to control the audio syncronization ?
> 
> my settings are:
> 
> vo = xv
> ao = oss (tried also with alsa9)
> cpu = Athlon 2200 xp
> 1Gb ram
> capturing video without any postprocessing results in 1% cpu usage,
> while capturing video with `-vop pp=lb' results in a 40% usage.
> 
> any suggestion ?
> thanks again !
> -- 
> Giuseppe Ciotta
> (string 72 101 108 108 111)
> 
> _______________________________________________
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-- 
Santiago Muelas
Profesor de Resistencia de Materiales y Cálculo de Estructuras
ETSI de Caminos, Canales y Puertos (U.P.M)
smuelas at mecanica.upm.es		http://w3.mecanica.upm.es/~smuelas