PAL to NTSC VOB conversion--again

[orion940]

I'm in this for the challenge now.

I demux out the sound using DVD2AVI. If its WAV, its cool. If it's AC3, I think there's a little more work. I'm unsure of how to handle an AC3 track.

Using Tmpeg2.5, I can convert the video portion to NTSC MPG2. I'm guessing I have to use BeSweet to convert PAL AC3 to NTSC AC3. I'm not sure of how to correct the offset (-404ms, etc). Will BeSweet maintain the skew in the NTSC conversion or output with a new time offset?

I was thinking of then MUX'ing the video and audio together, and re-author; or use something like DVDLab to author and give it the sound and video separate.

Anyone have thoughts on the sound part?

O.

[FulciLives]

I'm in this for the challenge now.

I demux out the sound using DVD2AVI. If its WAV, its cool. If it's AC3, I think there's a little more work. I'm unsure of how to handle an AC3 track.

Using Tmpeg2.5, I can convert the video portion to NTSC MPG2. I'm guessing I have to use BeSweet to convert PAL AC3 to NTSC AC3. I'm not sure of how to correct the offset (-404ms, etc). Will BeSweet maintain the skew in the NTSC conversion or output with a new time offset?

I was thinking of then MUX'ing the video and audio together, and re-author; or use something like DVDLab to author and give it the sound and video separate.

Anyone have thoughts on the sound part?

O.

Well there are 2 main ways to do the video conversion and one way will work correctly (if done correctly) using just TMPGEnc Plus but you have to have a progressive video source. Otherwise you have to deinterlace or you have to use the other method which needs AviSynth.

As for the audio ... it depends. If you use the frame rate slow down method (which works with a progressive source) then you need to slow the audio down.

Best way is to do that with BeSweet. It will account for the delay. It is best to convert the AC-3 to a PCM WAV file ... you can account for the delay here but don't do the PAL to NTSC option. After you get the PCM WAV file you can create a new PCM WAV using the PAL to NTSC option. Then you can use that PCM WAV as is or convert it to MP2 or AC-3. I've found it is best to conver the PAL AC-3 to a PCM WAV file first doing no "fixing" other than the delay THEN you can fool around with it to your heart's content. In other words don't try to go straight from AC-3 to AC-3 with the PAL to NTSC option otherwise you very well might end up with slightly out-of-sync A/V.

If you use the AviSynth method then the audio as is will be fine though you probably should accont for the delay. That can be done with AC3 Delay Corrector.

- John "FulciLives" Coleman

P.S.
See this here thread:
https://www.videohelp.com/forum/viewtopic.php?t=219852

[orion940]

I missed that other thread completely. I never searched in that thread, as it didn't seem like the thing to do at the time

Thanks for the help.

O.