[Scott Ogle]

Thanks for the tip, Chris. Audio Offset was set to 4 frames, which obviously doesn’t help a 4 second issue (not sure how it got that way, though). So I continued drilling down into the problem and now believe I have it solved. I’m going to post my results in case some other poor soul searches for this problem in the future.

First of all, the source tapes are 25 years old and have lots of dropouts and other issues. I couldn’t get a clean capture until I unchecked the User Setting to “abort capture on dropped frames”. I did keep the setting to “notify of time code breaks”. – – Not sure if that had anything to do with audio sync, since AJA says dropped frames would mean audio would LEAD video instead of the reverse, which was my problem.

The primary problem appears to be that capturing uncompressed video onto the iMac’s system drive is asking too much of the drive. Accepting a compressed capture (either DV50 or ProRes422) seems to work just fine. AJA tech support just sort of clucks at you for using an iMac, and says it is an unsupported use, but a Mac Pro is massive overkill for everything I do except a minor amount of editing, so I’ve developed lots of workarounds and this is just another example of one that’s needed.

[Scott Ogle]

If you are interested in selling your Aja ioLA, please contact me. I plan to buy one this week or next.
303.877.2600
scott@coloradotvcrew.com