Audio resampling timebase bug on timeline

Question

When importing audio into a non-23.97 fps timeline, the audio resampling is incorrect. The difference is 99.79%, so only becomes noticable on longer shots. eg.on a 25fps timeline, by second 400, frame 10000, the audio is out by ~22 frames. for 70 seconds, 1750 frames, the audio is out 3.7 frames.

When timeline is set to 23.97fps (not 24), the audio comes in perfectly and streams properly.

Tested with 44.1k 16b mono and stereo wav, 48k 24b wav, aiff, mp3, all responds the same way.
Audio tested from multiple sources, direct from DAW, and via premiere and ffmpeg rencoding/ resampling, no combination seems to change the issue.

Extracting a wav from SWF plays the wav as it is - not stretched like it is on the timeline.
Audio that has been slowed by 0.97% prior to import shows up correctly on the timeline and in playback, but plays slowed in the swf.

Cannot provide exact test file for nda, but replication for testing should be: Create a ~7min long scene with 25fps timeline. Create a 7min long wav with a distinct sound that plays at exactly frame 10000. Import into animate. check frame that distinct sound starts at.

The fact it works on a 23.97fps timeline points to some sort of interal clock issue?

Any chance for a bugfix?

Firewood：D · Answer

Hey buddy, you've noticed this problem too. I've investigated it before. The audio and video desynchronization issue starts around 30 seconds, and the longer the file, the more pronounced the audio misalignment. As you mentioned, this audio misalignment issue is rarely mentioned.

My usual solution is to use the old Flash CS6 to export a separate WAV audio track and then match the video and audio lengths in the Premiere Pro file. For example, in my texture, over a 3000-frame duration, the audio has already shifted this much.

I tried looking into frame rate, and it seems to be a legacy issue with no better solution. Exporting WAV audio from Flash CS6 and re-matching it is the optimal solution, or you could break the video into very short segments, but file management would be a headache.

This problem won't be solved, nor will it attract official attention, because Animate is practically dead.

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