A bad combination of circumstance: All CC versions have issues with Quicktime files just like they do with audio output. Other than experimenting with the audio preferences and other such settings you might try converting your files to other formats in external tools.
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Of course when I render the audio separate, it's fine. When I try to preview it all together, nothing plays past half way, and the audio cuts in and out up to that point. Beyond that, it goes no further. The video is too large? I also tried previewing at quarter.
- are you playing back cached frames? the only guaranteed real-time playback with Ae is of cached frames.
- what exact Ae version and OS version are you using
- see if checking off "hardware acceleration" under preferences->display makes a difference (if it's not grayed-out)
also know this - Ae is not designed to give a real-time playback instantly (like Premiere for example). this ability has been greatly improved in recent versions and you can see cases where a single video+audio can actually be played back in real-time right from the start (because it caches to RAM real fast). sometimes it's not the case.
maybe this would help:
Did you find a solution yet?
I did, thank you!