Audacity Forum

... AAC or M4A. Audacity doesn't know how to manage those and so it plays them as if they were normal files giving the chipmunk sound. You can use the FFMpeg software to make Audacity recognize and play many more different file types. http://audacityteam.org/download/linux Koz

I got the extracted audio file from the file share site. It was extracted by current FFmpeg as you say. Audacity cannot import with current FFmpeg on Windows and is restricted to the 0.6.2 version you downloaded from the buanzo site. On Windows 8, I don't have QuickTime ...

... difference. I can't, because Goldwave 5.69 can't open it: goldwave.png Every program that I've tried to decode the file with (SoX, mencoder, ffmpeg, foobar2000, VLC, MPlayer, avconv, and Audacity) shows the same errors and decodes it a couple of seconds shorter than the files original reported ...

In Goldwave I was able to import the file, and then export it to m4a format it, then using ffmpeg.exe I merged the saved m4a file back into the video file where it was in perfect sync. There are a large number of unanswered questions in this thread and I would need to ...

I have part of an answer. The file is faulty, possibly due to a problem in FFMpeg, or possibly due to dropped frames (not intentional ones) in the original video recording. The file information states that the duration is 52 minutes 44 seconds, but SoX, avconv, ...

Maybe the errors ffmpeg reports while converting the mp4 into WAV are a clue to the cause here: So FFMpeg is complaining there is something seriously wrong. This is not a graceful conversion. Since this seems to be one unresolved ...

I have part of an answer. The file is faulty, possibly due to a problem in FFMpeg, or possibly due to dropped frames (not intentional ones) in the original video recording. The file information states that the duration is 52 minutes 44 seconds, but SoX, avconv, ...

... (deselect) -- Apply (to this folder) or Apply to All Folders -- OK You can make Audacity open many more types of music files by installing the FFMpeg software. http://manual.audacityteam.org/o/man/faq_installation_and_plug_ins.html#ffdown Let us know if that helps. Koz

... Koz Okay so how would I fix that? The issue still happens when importing the same audio as a WAV file. Goldwave doesn't desync the audio. External FFmpeg shows the correct length. Only Audacity is having this issue. :( :(

... 10 posts. Have I got this correct and can you fill in some of the blanks: You have a M4A video file of length <...blank...> With standalone FFMpeg you convert the M4A video to M4A Audio format You import the M4A audio file in Audacity - Audacity says that it is 52m 43.392 seconds. You import ...