I'm doing a music score to a video, however I'm finding it impossible to work with because the video is badly out of sync when I record anything - it's even out of sync with the already recorded audio dialogue. However, in normal playback everything plays in sync. There are no problems with disk and memory usage even whilst recording.
I'm at a loss as to what to try to fix this so I would appreciate any ideas from you nice folks out there!
Thanks,
Mike.

So after much time wasted trying to get video to play whilst recording in Sonar, I downloaded a trial of Cubase and guess what - it runs perfectly in Cubase. Which proves that it is a Sonar issue and not something else at least.
I've been a loyal user of Cakewalk for over a decade so it would be a shame to jump ship now (especially considering the money involved) but it looks like it may be my only option unless Cakewalk have a solution.

I don't mean to assume anything but - did you try to adjust your buffer size (increasing it somewhat) while working with the video material.  Obviously, I don't what type of system your using, etc..  But whenever I have something go out of sync/lag etc...  Bumping my buffer size up a little solves the problem.  Just a thought.....

I don't mean to assume anything but - did you try to adjust your buffer size (increasing it somewhat) while working with the video material.  Obviously, I don't what type of system your using, etc..  But whenever I have something go out of sync/lag etc...  Bumping my buffer size up a little solves the problem.  Just a thought.....

I don't mean to assume anything but - did you try to adjust your buffer size (increasing it somewhat) while working with the video material.  Obviously, I don't what type of system your using, etc..  But whenever I have something go out of sync/lag etc...  Bumping my buffer size up a little solves the problem.  Just a thought.....

I don't mean to assume anything but - did you try to adjust your buffer size (increasing it somewhat) while working with the video material.  Obviously, I don't what type of system your using, etc..  But whenever I have something go out of sync/lag etc...  Bumping my buffer size up a little solves the problem.  Just a thought.....

Just tried increasing the buffer size and it's no better - in fact I think it might be worse!
Thanks for the suggestion though!

What format/codec is the video?   This definitely isn't an area I use often, but when I have I've found AVI to be pretty stable.
 

It's an MP4 video - no idea what codec I'm afraid - is there a way I can find out?

I (in error) said increase your buffer size - when I should have said decrease the buffer size and see if that solves the problem (that is while your recording).  After you have completed your recordings then bring your buffer size back up to where you usually have it...