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Mp3 consistent RAM playback

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Graham MacfarlaneMp3 consistent RAM playback
by on Jul 19, 2011 at 6:43:28 pm

Just noticed that an mp3 audio track when RAM previewing a short section in AE doesn't consistently play at exactly the right time. On one RAM playback it will line up with the visual animation perfectly then on a second play without changing anything it will be out by a fraction of a second.
Saving the Audio as an uncompressed WAV file seems to have solved the issue but I am curious why the mp3 causes the problem.

Can't see a way to stipulate a frame rate for the mp3 (in case of frame rate mismatching) but then I'm not doing that for the WAV file either and it works. Perhaps it's due to the mp3 compression??

Any thoughts as would love to know what’s going on!
Cheers

Graham Macfarlane
3D animator and VFX specialist
London UK


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Kevin ReinerRe: Mp3 consistent RAM playback
by on Jul 19, 2011 at 8:04:36 pm

must convert to .aif or .wav
AE hates mp3 like poison.

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Dave LaRondeRe: Mp3 consistent RAM playback
by on Jul 19, 2011 at 8:57:31 pm

[Graham Macfarlane] "...I am curious why the mp3 causes the problem...."

I'm glad you found the problem. You should know that for all the time I've been using AE, which began with AE Version 3.0 (not CS3, which is actually AE8), mp3 files have NEVER worked. AE simply does NOT like any kind of compressed audio.

Why? Beats the heck out of me, but it's been that way since 1993.

So going forward, your rule for audio should be, "Use only wav or aiff files".

Dave LaRonde
Sr. Promotion Producer
KCRG-TV (ABC) Cedar Rapids, IA


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Graham MacfarlaneRe: Mp3 consistent RAM playback
by on Jul 19, 2011 at 9:20:41 pm

Thanks for your comments guys!

Graham Macfarlane
3D animator and VFX specialist
London UK


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