sundance
23rd January 2003, 12:54
Last weekend I tried to make a backup copy of "Goldfinger" (R2-PAL).
As some other guys here noticed the english audio track has some oddities: When you demux the audio tracks w/ DVD2AVI the english AC3 file is shorter than the german one. Then, when you try to re-author the DVD, it starts perfectly synced during the first chapters of the movie. Then, after chapter 14 or 15 there is a sudden offset of some 0.7 seconds.
But when you play the IfoEdit version (movie only, stripped all but english/german audio tracks) both audio tracks a in sync!
The only explanation I have is that somewhere along the english audio track there is some sort of "gap" during a silent part of the movie, e.g. a black scene change. The VOB stream is probably looking like that:
--- MPEG2 stream ----------------------------
--- Audio english -------- ------------------
--- Audio german ----------------------------
And after demuxing it looks like that:
video1.mpv: --- MPEG2 stream ----------------------------
audio1.ac3: --- Audio english --------------------------
audio2.ac3: --- Audio german ----------------------------
Is there a way to fix that?
I tried to "create sync audio track" in DVDMaestro, but I'm not sure how to do it right since it created a longer AC3 track but still not in sync in the second half.
Yes, I could try to find the exact position where the potential gap is and fill it with some silence byte to fix the length, but is there a better, easier way?
-sundance-
As some other guys here noticed the english audio track has some oddities: When you demux the audio tracks w/ DVD2AVI the english AC3 file is shorter than the german one. Then, when you try to re-author the DVD, it starts perfectly synced during the first chapters of the movie. Then, after chapter 14 or 15 there is a sudden offset of some 0.7 seconds.
But when you play the IfoEdit version (movie only, stripped all but english/german audio tracks) both audio tracks a in sync!
The only explanation I have is that somewhere along the english audio track there is some sort of "gap" during a silent part of the movie, e.g. a black scene change. The VOB stream is probably looking like that:
--- MPEG2 stream ----------------------------
--- Audio english -------- ------------------
--- Audio german ----------------------------
And after demuxing it looks like that:
video1.mpv: --- MPEG2 stream ----------------------------
audio1.ac3: --- Audio english --------------------------
audio2.ac3: --- Audio german ----------------------------
Is there a way to fix that?
I tried to "create sync audio track" in DVDMaestro, but I'm not sure how to do it right since it created a longer AC3 track but still not in sync in the second half.
Yes, I could try to find the exact position where the potential gap is and fill it with some silence byte to fix the length, but is there a better, easier way?
-sundance-