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Audio running faster? + How do I determine video & audio fps?

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Hello!

I've encountered a problem and haven't been able to find a solution so I hope someone here can help me..!

Well, I have 2 movie files. One has very good picture quility (BDRip, .mkv) and the other one has the desirable audio track (.avi, different language). I have found a way to extract the audio from the .avi (in both .ac3 and .mp3 formats). Using mkvmerge GUI I have merged the two of them, after applying a delay to the audio track to match the start of the movie.

The problem is that even though it starts out in sync, the audio is "running faster" than the video and the gap grows constantly larger!

Any ideas??!

Although I don't know if the term "fps" can be used for audio, what I thought was that maybe it had something to do with a difference in the audio and video's fps.. I don't know how to determine the audio's fps at all and I sometimes have difficulties determining the video's fps as well. Could it have something to do with this??

If you need more information, just ask and... Thank you in advance~!

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