Ezequiel Tolnay wrote:
I was wondering if any of you has had a similar problem and figured a way to maintain the AV in sync after converting an mpeg to AVI format, or if any of you can give me any clues as to why is this happening and a way to prevent/solve it.
After much fidling with it, I found a solution for it, and would like to share it with whoever has this problem in the future. The problem is basically that the mpeg2 source has repeated frames, and the transcode utility filters them without compensating with the audio, thus creating a synching issue. If the source is already mpeg2 for video and audio but the dvdauthor doesn't like it, that's because the video also needs to be built for DVD (some kind of meta information between frames, or something like that). The same for other formats such as SVCD.
In my case the video had already the proper codecs (both mpeg2), the proper size (352x288 for PAL, which is fine), and the proper audio bitrate (224), but not formatted for DVD. To format it properly, use the following:
mencoder -oac copy -ovc copy -of mpeg -mpegopts format=dvd -vf harddup -o dvdformatted.mpg original.mpg
Should your source be in a different format, mencoder can take care of the proper transformations, there is a tutorial and a series of examples about it at www.mplayerhq.hu/DOCS/HTML/en/menc-feat-vcd-dvd.html (the page takes an eternity to load, by the way...). To create the DVD I used qdvdauthor, which is quite primitive but gets the job done quite nicely.
Happy authoring! Ezequiel -- gentoo-user@gentoo.org mailing list
