Audio out of Sync on webserver encode using mencoder

[misterio]

Hello,
we run a pretty busy site, our server specs are what I put on my profile during registration; our server load is usually at:

top - 22:23:11 up 23 days, 4:32, 1 user, load average: 2.23, 1.89, 1.62

We encode using mencoder, and users are able to encode to FLV and DivX simulatenously, by just clicking on a tab, the encodnig is done on teh same webserver (that runs teh platform for the site and encodes), the videos are not streamed from taht server, they are streamed on another server.

This is the command that we use to encode

For FLV Output to be able to be played with JWPlayer the command we run is:

/usr/bin/mencoder /home/xxxxx/public_html/video/1115.flv -o /home/xxxxx/public_html/1115x.flv
-of lavf -oac mp3lame -lameopts abr:br=56 -ovc lavc -lavcopts
vcodec=flv:vbitrate=800:mbd=2:mv0:trell:v4mv:keyin t=10:cbp:last_pred=3 -vop scale=630:391 -srate 22050
-lavfopts i_certify_that_my_video_stream_does_not_use_b_fram es

For Xvid, we encode using this command:

mencoder file.wmv/avi/flv -ofps 25 -ovc xvid -oac mp3lame -lameopts abr:br=128 -srate 48000 -vf scale -zoom -xy 630 -xvidencopts fixed_quant=4 -o outputtedfileinxvid.avi

this was basically a user uploading an FLV file to our site, but it also happens with other formats. What happens? the audio is out of sync, not by much, but it becomes very annoying after first 20 minutes of any video. Can someone please advise? I'd reall appreciate it . B

[Baldrick]

Tried a newer version of mencoder?

I use ffmpeg for this kind of server conversion and haven't seen any sync problems yet...or well I convert to h264 mp4 then but it also works to convert to flv.

[misterio]

Thanks, i'll try upgrading mencoder, further, would server load cause issues with a/v sync?