Audio Sync with Cutterman & SmartRipper

[dvdboy]

Hi,

I hope this is the correct forum, if not my apologies...

I have been recording programs off tv using a Philips Set-top DVD Recorder to DVD+RW. When I rip the stream using Smartripper 2.41 it tells me there is an audio delay in the resulting filename (somthing_ac3_2ch_blahlah_-45ms_delay.ac3 or similiar).

I know Cutterman gives you the option of adding an audio delay, but I have a couple of questions.

1 - Do I put the audio delay in exactly the same (-30ms means a -30ms delay in Cutterman) or do I put in the inverse to correct it (-30ms means a 30ms delay in Cutterman.)

2 - Does cutterman know the difference between PAL and NTSC when it comes to audio delays - I ask because the AC3 cutter I downloaded from the Internet assumes NTSC, and there is obviously a different number of ms to a frame depending if you're trimming PAL or NTSC.

Thanks for any help you can give - I would have asked at the official website, but I noticed the forums are German only.

Many Thanks

DVD-Boy

[E-Male]

you shouldn't get any problems there asking in english

AFAIK you enter the delay as it is

using ac3delaycorrector or something similar is independent from pal and ntsc as it works on the audio file only

[dvdboy]

Thanks Emale, I'll drop an email over at the official forum.

With regards to my other point, AC3 can have embedded timecode and AC3 Delay Corrector 2.0 at least assumes NTSC timecode.

Quote from Ouput Window:

"1 frame (32ms) has been added at start."

I was under the impression for PAL, there were 40ms to a frame.

Thanks Again.

DVD-Boy

[midnightsun]

The frame that's being referred to is an AC3 audio frame, which is 32ms long indeed. This has nothing to do with PAL and NTSC videoframe length though ;)

[dvdboy]

Interesting - that I never knew.

This ties in with the fact that you can re-use your AC3 streams when changing video from PAL to NTSC 29.97 NDF. If your start and end timecodes are the same, the audio is still in sync.

I found when trimming with AC3 Delay Corrector, the results seemed better when I assumed a 40ms / frame value.

Do you know any good places I can read up on this?

Cheers

DVD Boy

[djzoey]

Both movie and sound track reported 0ms for delay. I ripped both movie and sound track down stream using DVD Decryptor, then used muxman join them. Playing the final output files on power dvd 6, I notice a 2-3 second approx. out of sync issue throughout the whole movie and gets worse towards the end. Sounds started before any action or mouth movement. Is there a program that would help on this.