therealjoeblow
6th April 2005, 19:30
I've encoded dozens of my DVD's (ALL NTSC) with AutoGK over the past year, in most cases with perfect results; however, 2 of them have baffled me with inconsistent audio desync (My Dog Skip and MP's Holy Grail). By that I mean the audio is NOT consistently offset, nor is it the type of desync that's characteristic of a framerate problem, where it's synced at the beginning, but progressively goes off and gets worse with the movie's duration.
It's like this: In both cases, the audio has been perfectly insync at beginning and end, and throughout for 90 to 95% of the film, but at various discrete points, it's off by 160 to 200 ms. So, it's perfect, goes off by a noticeable amount, is perfect again, and cycles like this a few times.
In both cases, it was encoded to XviD (with AutoGK); and retained the original AC3(5.1) track. Ripping was done with DVDDecryptor in IFO mode. The DVD was perfectly insync at the points where the resulting .avi was off. I tried reencoding to a different file size or frame size and no change in the result. I tried encoding the AC3 to MP3 and Vorbis, and no change.
In both cases I tried several remuxing strategies, and all failed to correct the problem except as noted below:
VDubMod to .avi with various interleave/preload (128/128; 96/96, etc), always the same result with both videos (inconsistent desync, but always at the same points)
VDubMod to .mkv - same result
AviMuxGui to .avi - same result
AviMuxGui to .mkv - similar result - the desync was at the same places, but a little less noticeable, although not by much
MKVToolNix (MMG) to .mkv - similar result, slightly better than AviMuxGui, but again not substantial.
HOWEVER - Muxing with VDubMod to the *OGM* container appears to handle this situation much better:
-for My Dog Skip, the audio was perfectly insync in the OGM container throughout, at all of the trouble spots.
-for MP's Holy Grail, it was not perfect, but 90% better than any of the .avi or .mkv versions. Still noticeable but now it was more like 40-60ms rather than 160-200, and a couple of the spots were ok.
Like I said, it's only these 2 films that I noticed this on., but it drives me nuts that I can't understand it or fix it.
Anyone else ever encounter this, or know what's going on?
It's like this: In both cases, the audio has been perfectly insync at beginning and end, and throughout for 90 to 95% of the film, but at various discrete points, it's off by 160 to 200 ms. So, it's perfect, goes off by a noticeable amount, is perfect again, and cycles like this a few times.
In both cases, it was encoded to XviD (with AutoGK); and retained the original AC3(5.1) track. Ripping was done with DVDDecryptor in IFO mode. The DVD was perfectly insync at the points where the resulting .avi was off. I tried reencoding to a different file size or frame size and no change in the result. I tried encoding the AC3 to MP3 and Vorbis, and no change.
In both cases I tried several remuxing strategies, and all failed to correct the problem except as noted below:
VDubMod to .avi with various interleave/preload (128/128; 96/96, etc), always the same result with both videos (inconsistent desync, but always at the same points)
VDubMod to .mkv - same result
AviMuxGui to .avi - same result
AviMuxGui to .mkv - similar result - the desync was at the same places, but a little less noticeable, although not by much
MKVToolNix (MMG) to .mkv - similar result, slightly better than AviMuxGui, but again not substantial.
HOWEVER - Muxing with VDubMod to the *OGM* container appears to handle this situation much better:
-for My Dog Skip, the audio was perfectly insync in the OGM container throughout, at all of the trouble spots.
-for MP's Holy Grail, it was not perfect, but 90% better than any of the .avi or .mkv versions. Still noticeable but now it was more like 40-60ms rather than 160-200, and a couple of the spots were ok.
Like I said, it's only these 2 films that I noticed this on., but it drives me nuts that I can't understand it or fix it.
Anyone else ever encounter this, or know what's going on?