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I am just trying to change the audio from AAC to AC3 and it creates a video where the audio is slightly out of sync. If I watch the original video then it is perfect.

I have read some posts where the describe this situation being similar to inserting a video that has one set of frames per second, into another with a different set of frames per second.

ffmpeg -i 08-22-24-Not-if-4K-PQ.mp4 -acodec ac3 not-if-ac3.mp4

Once more, the original file works as expected, but the new files which now has AC3 audio is out of sync.

AAC: AAC stats

AC3: AC3 stats

In the other posts that I read, they were saying the difference in frame rate for audio does not matter, but something is obviously off.

How can I make sure that they audio is the same as the original, with the exception of being converted to AC3 encoding?

Giacomo1968
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kronus
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1 Answers1

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I received this answer from another post in case someone else is going through this issue:

ffmpeg -i 08-22-24-Not-if-4K-PQ.mp4 -c:v copy -c:a ac3 not-if-ac3.mp4

Other post, which lead me to finding this answer

kronus
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