I know some variety of this question is posted here quite a bit.
Recently, I've been having issues previewing .m4a audio files in my timeline. The audio was recorded on a yeti mic onto a MacBook Pro. I'm using AE 2019/Windows10.
I've been out of the habit of loading my video/audio clips into Premier to sync the audio and cut the takes I need before I edit them in AE. Up until recently, AE was able to ram preview 90minute .mts video files and audio files with ease as long as I previewed at 50% resolution.
I can preview video files just fine in the same manner, but if the composition contains an .m4a audio file AE ram preview stops working as expected...even if I create a composition with JUST an .m4a audio file, my RAM preview never accelerates past 5frames/sec, and my 58GB of my 64GB of ram is immediately used up in my task manager. Purging my disk cache brings my RAM to 0, and then immediately back up to the previous level once I preview the comp again. I can render the timeline much faster than I can RAM preview it.
In the past, I've used Audition to re-save the audio files into an uncompressed .wav format...I don't know if audio codecs have their own temporal compression, but sometimes this does the job....but it didn't work today.
If I pre-compose the audio and video, my preview speed improves a bit but my learned workflow for dealing with audio/video syncing is distrupted.
Can anyone chime in as to why an audio format (.m4a) would cause AE to grind to a halt, but soloing the 4K .mts file in the same timeline plays smoothly (50% res)
-Thanks for your time guys
-Dan
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