First thing to try -- purge all your memory & caches. It ought to fix things.
Thanks for taking the time to reply Dave.
I did 'purge all' which did help temporarily but the issue does return within a short space of time as I continue working. This is okay if I'm building the comp but it presents more of a problem when I set a render which is trickier because it cant be interrupted.
If I close AE then reopen and reload the project it also helps but its success rate seems to be dependent on the complexity of the project.
Are you working in AE CC 2015? Can you do your work in AE CC 2014? If yes, I recommend it. AE CC 2015 just has too many weird things going on with it -- you almost have to be an IT Guy to get things set straight, and even then it has a long list of bugs.
If you need a link to get AE CC 2014, here you go:
Sometimes MP4 footage gets all fouled up when it is decoded by cpu. This could cause what you're seeing. My suggestion would be to render your camera original to a suitable production format or an image sequence. Then just replace the original footage in the cob with the DI (digital intermediate).
I do not have specific experience with a Panasonic GH4 but I have had problems with other Panasonic footage. Creating a good DI solves the problem.
Thanks for the link Dave
I'm actually working in CS4. The new CC versions aren't financially viable for me long term unfortunately but I'll bear it in mind.
Thanks for the reply Rick.
I have considered exporting to a different format but I want to avoid 2nd and 3rd etc generations of recompression or conversely ending up with massive uncompressed files.
Part of the problem is that I am having problems rendering/exporting from AE in the first place which will preclude a conversion to another decent format anyway.
Do you recommend any free codecs or conversion methods that could work here?
Ooooohhhhh, well that's much different! You HAVE to transcode your video. The reason -- Mp4 video gives AE9 fits. Go to a good, lossless or darned-near lossless codec. I like QT movies in the PNG, Animation or Photo JPEG codecs.
Yes, the file sizes will be larger, but what do you have now? Bupkiss.
Gotcha. Thanks Dave. I have found the Lagarith codec to be very good in the past too so I will try them all out and compare.
Be very careful with third-party codec packs. They can wreak havoc on Adobe products.
Lagarith was recommended to me by another member of this forum a few years back and so far it has performed without issue.......unlike the mp4 problem I have now!