DivX files have audio off by .2 milliseconds

[captvanhalen]

Hello all. I have been experiencing mostly great success in converting my DVD collection to DivX with ffmpegX. One thing concerns me, however.

All of my encodes are roughly .2 milliseconds off (ahead).

I have a workaround -- XMBC allows you to nudge the audio delay, but if there is something that i am doing wrong i would like to fix it, or if there is an additional step then i would like to know about it. Is this what AVI Fix does?

Thanks, i can arrange to post a snippet of video if you like.

[jagabo]

You can notice a 200 microsecond delay?

I know a lot of MP3 and AC3 encoders create a ~10 to ~40 ms delay. You can shift the audio forward by that amount before encoding if necessary. Don't know about ffmpegx.

[tomlee59]

I'm sure you mean a 0.2 second (=200 millisecond) delay. That amount of delay is intolerable, whereas a 200 microsecond (0.2 millisecond) delay is not discernible.

I've not run into this problem when converting into divx using D-Vision3 (I have not used ffmpegx), so perhaps switching to D-Vision3 (free, and trouble-free) might take care of your future encodes. As for fixing the ones you've already done, there are tools that will demux (e.g. VirtualDub), from which you can remux with an appropriate delay to compensate.

[captvanhalen]

Oh dear ... yes i meant .2 seconds.

It's like i was saying to my friend today ... never look a gift horse in the ass.

Or was that lick?

Anyhoo ... funny thing about D-Vision3, i have been using to it to extract audio commentary tracks which i MUX into avi files with ffmpegX. Those are approximately .3 seconds off.

How i determine this is by nudging the delay amount from the player until spoken words synch up with their respective lips. Damn how i wish i could detect .2 milliseconds -- there's some bucks to be had with that talent.

Thanks for the info ... sorry for the typo.

[jagabo]

It's quite common for the audio tracks on DVDs to lead or lag the video. Part of the VOB header (or IFO?) indicates by how much so the player can compensate.

[lequis]

I just converted two files with FFmpegX from MP4/H.264 to the same format with a lower bitrate, and they both have the same problem when viewed in Quicktime. Playing them in VLC eliminates the problem.