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Originally Posted by AgNa
How to PAL to NTSC, including AC3 audio.
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Use AssumeFPS(23.976) to change the video frame rate.
As for the audio stretching, you'll have to split the AC3 into its component streams (i.e. if it's 2-channel, get WAVs for left and right, if it's 6-channel, get WAVs for front left, front right, centre, rear left, rear right and LFE). You'll need a lot of HD space for this...
Once you have the WAVs you can use your favourite time stretching software to change the run length of all of them (I use Adobe Audition, formerly known as CoolEdit, but it doesn't really matter). You want the new WAVs to be all the same length, to match the slowed-down video. I assume you know how to do this already -- if not there are a bunch of guides available.
Now you have your new, time-stretched WAVs, and you need to convert them back to AC3. TMPGEnc DVD Author can do it if you have a two-channel source. If you have more than two channels you'll need to use a standalone AC3 encoder to do it. I use the encoder that comes with Sonic Scenarist (never could get SoftEncode to work). For two-channel audio use 192kbps. For six-channel audio use 448kbps.
Thus you'll end up with your video and your new AC3, and when muxed together they should be in sync...
Good luck

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