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Originally posted by: Darth Editous
How did it do that? Did the audio sound lower on the NTSC one (in which case I'd be surprised if it was still AC3), or does it cut out some frames to keep it in sync?
DE
It remains as 5.1 448 kbps AC3 when converting to NTSC. The framerate is changed to 29.97 FPS NTSC (rather than 23.976 FPS flagged to 29.97 FPS) and the audio was obviously adjusted to match, which I don't know the exact process that it used, but it likely did something similar to BeSweet's PAL ---> NTSC audio conversion, which works perfectly. The audio remained in sync
How did it do that? Did the audio sound lower on the NTSC one (in which case I'd be surprised if it was still AC3), or does it cut out some frames to keep it in sync?
DE
I've seen ever better tricks, in terms of weird audio/video conversions and maintaining sync. NeroVision Express can take the MPEG-1 file from a PAL SVCD and convert it automatically to an NTSC DVD without losing sync or anything noticeably wrong with it. So that is changing the video framerate from PAL to NTSC and changing the audio, not only to make it match an NTSC video stream, but upping the frequency from 44.1 kHz to 48 kHz as well. DVD-lab can do the same thing though it guides you through a series of steps and the results are a bit erratic in terms of audio sync, but acceptable I guess. Nero does it better, perfectly even; the only advantage of DVD-lab for such a project (SVCD to DVD) is that it doesn't insist on re-encoding the video like Nero always does; since SVCD is roughly DVD compliant in the first place.
