I have a problem... I have to create a video that will go onto 3 screens but which has to be 1 video file. The aspect ratio they are asking for is 5760 x 1080 and they want compression format H.264 and mp4. When I try and render my project in After Effects I get the error message: AEGP Plugin Media IO Plugin: There is a mismatch between output module settings and transcode settings. Please verify your settings and try again. Property Data Invalid! Medial02 error 0x400e0004. Frame dimensions out of bounds (5027 :: 12)
H.264 is only optimized for certain aspect ratios and pixel dimensions. You should output to a more flexible format such as Animation, then try to convert it to H.264 in another program like Quicktime Pro, Adobe Media Encoder, MPEG Streamclip or Apple Compressor.
I had to do a similar aspect ratio for split screens at a conference awhile back. It took a couple of tries, but it finally worked. I think I ended up using Quicktime Pro.
Thanks for your answer! I had to call a guy that walked me thru. Ended up doing what you just suggested. I also learned that you need to edit the Data Rate in Quicktime! So all in all an educative experience!