Converting 1080i HDV - audio sync
by Scott Bush
on
Oct 27, 2009 at 4:06:46 pm
Hi,
I'm trying to convert some 1080i HDV footage to 720p Prores quicktime mov using episode 5.2.1.
The video looks great, but the audio goes about 2 seconds out of sync, despite the fact that I have it set to "copy" the audio track directly (no re-encode). I have no changes to frame rate either, just setting the frame size from 1080i (HDV pixels) to 720p square pixels.
I have also tried re-encoding the audio but get the same exact offset. Any suggestions?
Re: Converting 1080i HDV - audio sync by Scott Bush on Oct 28, 2009 at 7:37:28 pm
Thanks for getting back to me, Craig.
I installed 5.3 and ran the test again - same exact results. The original file is 1080i HDV quicktime at 29.97 frames per second. I am converting to ProRes444 720p, same frame rate.
The original file is 1:20;44 according to quicktime player 7 (in 10.5.8). The re-encoded file comes out to 1:21;31 - and this is where the audio offset happens - it copies the same audio track over with no conversion - so the audio track is actually the same length as the original - only the video is a second longer.
Ran again with forced re-encode of audio and same exact results.
This is very odd - any idea why this could happen?
Thanks.
QUICK UPDATE: just did the same conversion with Compressor, and the A/V sync is fine, but the image is nicer with Episode, so I'd rather use it if I can sort this...
