Quicktime 10 not liking .mp4s from AE

We just finished a job in After Effects and rendered out as .mp4s (compressor: mp4v) and the files will not play in Quicktime 10.2. They will open fine in M Player, VLC, MPEG Streamclip but not Quicktime. Has anyone else seen this behavior?

JVK

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SCQT! Self-contained QuickTime ? pass it on!

I have seen this before with Adobe Media Encoder. I cannot open H.264 files generated by the Blu-ray presets in QuickTime, however other applications see them just fine. When I use the Blu-ray presets in Compressor the files are able to open just fine in QuickTime.

The workaround would be to export from AE as a QuickTime with the desired settings.

My software:
Pro Maintenance Tools - Tools to keep Final Cut Studio, Final Cut Pro X, Avid Media Composer and Adobe Premiere Pro running smoothly and fix problems when they arise
Pro Media Tools - Edit QuickTime chapters and metadata, detect gamma shifts, edit markers, watch renders and more
More tools...