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This past weekend I used Adobe Encore for the first time to create a Blu-ray for an important screening. I'd previously tested the workflow and everything had worked well, but this was my first time using it on a project.
I initially had some issues encoding the Premiere Pro sequence to H.264 because Adobe Media Encoder told me it would take 42 hours, and after leaving it for a few hours it seemed to be making good on that promise. I eventually narrowed the problem down to a corrupt Dynamic Link cache which I trashed with CS Repair and got the more respectable prediction of 10 hours (it was a 90 minute feature with 10-bit RGB source files).
I checked the original source files and they were fine. I checked the AC3 and it was fine. I restarted Encore and the problem was still there. I cleared the media cache from within the preferences menu; no change. I thought it might just be the preview but the problem existed on a test disc that I burned.
I eventually traced it to project corruption. There is a file in your project directory called ProjectMedia.acx. This is what the end of the file looked like:
The file should end with the closing XML tag </EncoreProject> (and there should only be one) but extra data has been added at the end. To fix this, close Encore, open up the file in TextEdit and delete everything beyond the first </EncoreProject> tag.
Then trash your media cache. For some reason the button in preferences doesn't remove everything so I'd recommend removing all files from the media cache directories at ~/Library/Application Support/Adobe/Common or by using Housekeeper.
I relaunched Encore, everything worked properly and I was able to create the disc and breathe a sigh of relief. I would definitely recommend keeping an eye on ProjectMedia.acx though because I just checked it again and more corruption has crept in.