i have a concert VHS transferred from pal to ntsc that i want to put onto DVD (in ntsc). i want to add an extra audio track taken from a cassette > DAT. i've done this before without problems but the audio taken from the PAL tape is running a little slower than the cassette > DAT audio. [i'm assuming the cassette was played back at the proper rate.]
i thought perhaps i should run the audio in besweet's pal25frame>ntsc23.xframe. this got the rate of the cassette audio much closer to the VHS transfer but still not quite good enough. roughly for every 16 minutes it gets out of sync 8 seconds. this is a constant sync problem. should i be running the audio through a different conversion in besweet? i don't think any of them would work better. [for the hell of it i tried 29frame>25frame pal and got something too slow; i need something in between the pal25frame>ntsc23.x farme and the 29frame>25frame conversion.]
my next guess is that i need to use goldwave's time warp. can anyone make a suggestion as to how i can do this very precisely? since the difference is so slight throughout the recording, a minor variance in the time warp setting will make a huge difference.
finally, would re-encoding the video with different settings help? i used the standard NTSC settings since the tape is in NTSC, meaning the box for "do not do frame rate conversion" is not checked and all of the NTSC frame rate settings and such are set for NTSC. i'm guessing, though, since i have an NTSC tape the conversion should be no different even if it's a PAL>NTSC transfer tape.
my thanks to anyone with any suggestions.
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difficult one!
was the concert shot on video or film? if it was shot on film then your conversion process is off, you need to slow the 25fps PAL down to 23.976fps and also slow down the audio with bsweet. see how your sync issue is if you do that. also, atre you capping the DAT tape digitally or as analogue? if you're capping digital at 48khz but playing at 44khz you will noticed a dfference!
also, are you recording your VHS tape at 44khz or 48khz? obviously your DVD needs to be 48khz, what conversion method are you using? -
thanks for your reply! perhaps we can get to the bottom of this. if not, i guess i'm stuck with the cam audio.
the concert was shot on a PAL video camera, probably an 8mm cam, so it was going at 25fps.
i transferred the DAT digitally to my harddrive. the DAT was in 44.1 so i upsampled to 48k with cool edit using the highest quality settings. i know there's a potential for problems here, but i've transferred a few DATs from 44.1 to 48k and then synced with avi>48k audio without problems, so i'm assuming it's not that. also, i'm aware of a tape flip around the 45 minute mark but that's definitely not the problem -- the audio drifts from the begining and gets worse at the same rate.
finally, the source audio from the vhs tape is in 48k. i grabbed the video through firewire (so no capture cards; there are also no dropped frames in the video or video factory would have told me -- i also don't notice any), then converted the AVI to 48k wav using goldwave, again a process that could possibly mess up the audio but has never given me problems before, so i'm assuming it's not that.
Originally Posted by flaninacupboard
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