I have an audio sync case to add to this thread:
I create D1 NTSC DVD's (720x480, 4000 kbps bitrate, AC3 audio) starting with "medium" TiVo files (352x480 MPEG2, 2700 kbps, mp2 audio) I have two process paths to do this:
1. Edit TiVo with VideoReDo save as .mpg or .tivo, sometimes also do a "Quick Stream Fix".
2. Input edited .mpg or .tivo to MyDVD
3. Set project settings to 720x480, 4 Mbps, Interlaced, AC3 audio 448 kbps.
4. Burn to ISO (then burn to DVD and/or view in PowerDVD).
1. Edit TiVo with VideoReDo and output as .vob or .mpg, sometimes QSF.
2. Input file to gui4ffmpeg (free encoding software from VideoHelp.com). Settings are the same
as step 3 in MyDVD path.
3. Input output .mpg to DVDStyler and author to ISO.
I have one test clip for which the MyDVD version video lags audio by about 200 msec, i.e., just noticeable. The problem does not exist on the DVDStyler version.
1. The sync problem does not exist in the source files.
2. The sync problem does appear in either PowerDVD playback of the ISO or on actual standalone DVD playback.
3. If I rip the .vob files for the clip from the two .iso files, the sync problem does appear when the MyDVD version is played in a software player.
4. Using gspot, the source files are interlaced, TFF (top-field first).
5. The .mpg out of gui4ffmpeg is interlaced, TFF.
6. The .vob ripped from the DVDStyler ISO is interlaced, TFF.
7. The .vob ripped from the MyDVD ISO is interlaced but is BFF (bottom field first).
I have to conclude from this that MyDVD is the cause of the audio sync problem.
I have to wonder whether the reversal of interlaced field order by MyDVD might not be the source of the problem, and I wonder why it does this?
BTW, I was able to correct the sync in the MyDVD ISO by introducing a compensating shift in the input file using VideoReDo. Does EMC9 provide a way to do this?