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best method for converting PAL ac3 5.1 to NTSC ac3 5.1

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Hi guys,
I have converted 2.0 ac3 from PAL to NTSC,but what is the best method of doing this for ac3 5.1 channel,and keep good sound volume,I need to do this on my next HD2DVD project.
here in the US we didnt get a 16:9 anamorphic widescreen release and our version only had 2.0 sound,but I have the PAL Silver Anniversary Edition and I want to lift the 5.1 ac3 file from it and add it to my project.
so any tips and pointers would be great
Moth3r you git your ears on?

DJ
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dgpulldown
http://www.videohelp.com/tools?tool=DGPulldown
http://neuron2.net/dgpulldown/dgpulldown.html

or use one of these programs to convert the pal dvd to ntsc and then rip the audio from that conversion to sync up to your ntsc video

I've also used VSO ConvertXtoDVD v2.1.5.173 to convert pal to ntsc. Then you could just use a dvdrip program to extract just the 5.1 audio

excellent guides found here http://www.videohelp.com/guides.php?howtoselect=4;41#4;41

overall I think dgpulldown might be the easiest way to do it..



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You could encode the video to 25fps and use DGPulldown to apply the relevant pulldown flags, and mux with the unchanged PAL audio. However I think you'd be better off converting the audio.

First you need to check if the PAL audio is a straight speed up, or a pitch-corrected version. Listen to a portion of the NTSC audio, then the PAL, and if the PAL sounds higher pitched then the conversion is a simple process.

(You should also check that the video ripped from the PAL DVD has the same number of frames as your IVTCed HD conversion.)

BeSweet is fine for the rate conversion, but the encoder BeSweet uses (ac3enc) is not as good as commercial software. Therefore, I'd output 6 channels from BeSweet and feed them into a commercial AC-3 encoder if you have access to one.

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You could use BeSweet as Moth3r recommends and get a difference on the number of frames. Then do a time compress/expand of the audio in a higher-end app like Vegas.

Once you have the number of frames for the target, I would load the AC3 into Womble and export as a WAV file. Then load that WAV into Vegas, normalize the audio, perform the stretch/squeeze to the number of frames, and export back to AC3. Womble is a great way-station for AC3-to-WAV conversions, where other tools I've used can cause changes in the length or introduce digital pops.
I am fluent in over six million forms of procrastination.
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I like to use Sony Sound Forge for converting AC3 to WAV. No distortion or pops, and no change in volume. I just load the VOB right in, and save as WAV.

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thanks everyone for all the suggestions,I will try them out,but stay tuned,I am sure I will have more questions LOL.
thanks again
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Originally posted by: ADigitalMan
... Then do a time compress/expand of the audio in a higher-end app like Vegas. This would only be required if pitch-correction had been applied when the PAL DVD was mastered. If PAL speed-up is present , then a simple rate change would be adequate. It should be obvious by listening to the 2 soundtracks sise by side what method you will need to use.
Originally posted by: ADigitalMan
...Then load that WAV into Vegas, normalize the audio, perform the stretch/squeeze to the number of frames, and export back to AC3. ...
In this case, normalization is not required. Just make a note of the dialnorm value in the original PAL bitstream, and use the same value when re-encoding the slowed-down WAVs back to AC3.

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