DVD encoded video and audio progressively get out of sync

Hi Compressor professionados,
I've been trying to finalise a DVD I’m creating but keep having the same show-stopping problem where I just can't get the timing of the audio and video right after encoding it to MPEG-2/ac3 for DVD Studio Pro. When I lay it into the track in DVDSPro it plays fine at the start of the track but as the clip gets longer the audio and video gets further and further out of sync, by a few seconds (eg. for over 1 hour length footage).
I've seen similar posts online about timing issues with Compressor but nothing I saw has hit the nail on the head for me. I also posted my problem on Creative Cow but didn't get the help I needed to fix my problem.
Here's the specs:
FCPro X 10.1.4
Video project: 1080i (@ 25i)
Audio 44.1 kHz
Render: Apple ProRes 422
Length: 01:13:05:02
Compressor 4.1.3
MPEG-2 Setting (only what I think is important... or I don't know)
Format: Elementary Stream
Stream Usage: DVD
Retiming: Set duration to: 100% (shows 01:13:05:02)
Video Frame Rate: Auto (25fps)
Field Order: Same as Source
GOP: greyed out at 12
ac3:
Sample rate: 48kHz (the only choice)
Data rate: 224 kbps
DVD Studio Pro 4.2.1
PAL DVD-9 project
From FCP I send my project to Compressor and when I drop both a DVD Audio and Video codec onto it they both show as Retiming 100% (and the length looks the same) but the results are still unsynchronised at the end of the clip when they are placed into the Track in DVDSPro. I've also tried changing different settings, like MPEG-2 Retiming duration to "So source frames play at 25 fps", but I'm still having troubles.
At one point I managed to get the A/V timing right for my track and I then ran what I thought was the same settings for all my other tracks in the DVD but they ended up with a similar outa-sync problem so I deleted everything to try again and realised I'd deleted my good files. And I just can't seem to replicate it again. I’m not sure if it was an accidental mistake that worked or I hit on the right settings. Either way, it shouldn’t be this hard to get it right, for heaven's sake!!!
Also, strangely, when I open the MPEG-2 file in QuickTime Player (10.4) it shows 01:10:30 long but if I open the same file in QuickTime Pro 7 it shows as the correct 1:13:05. And DVD Studio Pro shows 01:13:05:02 for both the audio & video assets but their sync is still out at the end.
This problem stopped me from producing the DVD last Christmas and I tried to pick it up again to give it to the family for this Christmas but ended up having to bail yet again - not impressed!!!
I'm hoping it's a simple solution of getting the settings right but it may also be a bug! Apparently, my bro-in-law has had similar problems and has ditched the DVD route altogether. I already have all of my menus etc. set up and I'd hate to have to ditch all that hard work.
Thanks in anticipation,
Brett

Thanks so much Russ & Tom!
It was as easy as changing the sample rate in the FCP project from 44.1 to 48 and sending it to Compressor again. I think it was set to 44.1 because I had the project set to automatically assign the parameters from the first video dropped into it. I haven't checked yet but the audio from my camera is likely 44.1.
It would be nice if Compressor produced a warning message when you set the codec up for DVD audio that the original is set to a different sample rate & may cause timing problems when resampled to 48kHz.
Anyway, again THANKS lads for solving what has been a year long problem for me and now I can complete my Christmas project, albeit late!
Virtual chocolates to you both!!!

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Message was edited by: stebianchi
Message was edited by: stebianchi

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