After upgrading to AE 12.2, I noticed an error popping up while working on the next video of a series (which had not had any problems before, even using the same footage). I was getting "Error (4) reading frame from file..." errors, immediately followed by a "Keylight out of memory (4) (25::241)" error. I got both errors twice before I could move the playhead again.
I tried opening other projects that had been workin fine on 12.1, both from the same seriesbut previous episodes and also other projects using footage from the same camera with and without Keylight and encountered the error again. removing Keylight did not solve the issue. After some forum searches (mostly turning up older issues revolving around the DVCProHD Output component), I was able to confirm through activity monitor that Adobe QT32 Server was not responding whenever the error popped up. I tried all of the support suggestions I could find regarding QT32 server (deleting prefereneces, removing the output component, etc.), with no change in errors. I had a coworker who had also updated to 12.2 try it out, and he also received the errors, just like I had. I opened the project on another coworker's computer with 12.1 and was able to work and output without issue (output both from the Render Queue and from AME were also failing).
Tech details:
Footage was DVCProHD .mxf's from an HVX200, shot on greenscreen and keyed with Keylight. Footage was originally editing in Premiere Pro CC (latest version) then dynamic linked to get the timeline into AE. All remaining work was completed and output from AE (this is how I have done this entire series). Footage is being pulled from a NAS over a gigabit connection. I'm on OS X 10.9, on a 2.7 GHz i5 iMac with 10GB of RAM and an AMD Radeon HD 6770M 512 MB:
Let me know what other information you need. I had to downgrade to 12.1 so that I could finish this project (which resolved the issue), but my coworker's computer that was experiencing the same errors is still on 12.2, so I can look at troubleshooting on it if needed for testing.