HDV to DV downconverting: problems with sound at DVinfo.net

Alex Savin · October 21st, 2006, 12:18 PM

Allright, the problem is that sound is about 1% ahead of picture, after converting m2t 1440x1080p file into DV (RawDV or avi DV - same result).

On the original m2t file sound and picture are in perfect sync. I'm using Canopus Procoder 2 for downconverting, no funny settings, just usual DV profile.

Interesting thing - when using AspectHD for converting this m2t file into CineformAVI, completely same problem with audio sync - sound is a bit ahead of picture, and difference is growing while watching the video.

I flipped through forum, there were few topics about same problem, and none of them was really solved. Any idea, why this might happen, would be appreciated.

(and, I suppose, PC configuration has nothing to do with that, because this delay appears while playing back usual DV video, which never before caused any such problems).

Graham Hickling · October 21st, 2006, 09:07 PM

This is in PAL, right?

Procoder has an option that deliberately changes file length by a percent or so during its PAL-NTSC conversions (to improve convesion quality). I can't see why that would be relevant, really, but I thought I would mention it...

Alex Savin · October 22nd, 2006, 03:32 PM

Well, thanks, but that is not really about NTSC-PAL conversion, and more about m2t - AVI conversion.

Funny thing - just tried importing m2t file into Adobe Premiere 2.0 - and there is this audio gap as well. What I don't understand is that there is no gap at all when just playing back m2t files, say, on Windows Media player.

Graham Hickling · October 22nd, 2006, 04:29 PM

Yep, I realize that. I use Procoder for m2t-avi conversion in concert with Premiere Pro all the time and never have a problem, so maybe there's an installation issue.

October 21st, 2006, 12:18 PM	#1
Alex Savin New Boot Join Date: Aug 2006 Location: Tampere, Finland Posts: 7	HDV to DV downconverting: problems with sound Allright, the problem is that sound is about 1% ahead of picture, after converting m2t 1440x1080p file into DV (RawDV or avi DV - same result). On the original m2t file sound and picture are in perfect sync. I'm using Canopus Procoder 2 for downconverting, no funny settings, just usual DV profile. Interesting thing - when using AspectHD for converting this m2t file into CineformAVI, completely same problem with audio sync - sound is a bit ahead of picture, and difference is growing while watching the video. I flipped through forum, there were few topics about same problem, and none of them was really solved. Any idea, why this might happen, would be appreciated. (and, I suppose, PC configuration has nothing to do with that, because this delay appears while playing back usual DV video, which never before caused any such problems).

October 21st, 2006, 09:07 PM	#2
Graham Hickling Trustee Join Date: May 2004 Location: Knoxville, Tennessee Posts: 1,669	This is in PAL, right? Procoder has an option that deliberately changes file length by a percent or so during its PAL-NTSC conversions (to improve convesion quality). I can't see why that would be relevant, really, but I thought I would mention it...

October 22nd, 2006, 03:32 PM	#3
Alex Savin New Boot Join Date: Aug 2006 Location: Tampere, Finland Posts: 7	Well, thanks, but that is not really about NTSC-PAL conversion, and more about m2t - AVI conversion. Funny thing - just tried importing m2t file into Adobe Premiere 2.0 - and there is this audio gap as well. What I don't understand is that there is no gap at all when just playing back m2t files, say, on Windows Media player.

October 22nd, 2006, 04:29 PM	#4
Graham Hickling Trustee Join Date: May 2004 Location: Knoxville, Tennessee Posts: 1,669	Yep, I realize that. I use Procoder for m2t-avi conversion in concert with Premiere Pro all the time and never have a problem, so maybe there's an installation issue.