Audacity Forum

Yes, that looks OK.

Try opening a WAV or MP3 file, and see if you can export it as M4A/AAC.

If that works FFmpeg is at least partially working and, maybe there's something wrong with your AAC files. Try checking one of the files with MediaInfoOnline.

It would seem so (see Screenshot)

... doesn't quite match my situation. HELP! I keep having files disappear on me. The log reads: 21:16:52: Audacity 2.4.2 21:16:52: Trying to load FFmpeg libraries... 21:16:52: Trying to load FFmpeg libraries from system paths. File name is 'avformat-55.dll'. 21:16:52: Looking up PATH environment ...

You will need to use an encoder that supports 10 channels. Audacity's "FFmpeg libvo_aacenc" only supports up to 8 channels.
Perhaps you could use OGG instead?

... irrelevant - something has changed on your Mac. Did you update Audacity from version 2.3.0? Versions after that require the 64-bit version of the FFmpeg library. To import M4A files you do, indeed, need the FFmpeg library. Please go to the Help menu > Diagnostics > Show Log. Click and drag through ...

... to wxWidgets isn't in PATH, then when building Audacity, use the option: -DwxWidgets_CONFIG_EXECUTABLE=<path to>/wx-config Note that for system FFmpeg to work it is necessary to build Audacity with the option: -Daudacity_use_ffmpeg=loaded I hope that helps, but if you get stuck I'd recommend ...

Does it show-up under Libraries?

If the files are WAV or MP3 they should not trigger that warning and should not require the ffmpeg library. Installing the library will not help . You say this happened suddenly. That means that something changed. Any idea what that might have been? After doing the reset ...

- I am on windows 7 with audacity build 2.3.3 - I have ffmpeg-win-2.2.2 installed in the correct place and i have tried manually locating it within the program but it has automatically located it correctly. .aac files still won't open, i get: without ...

... out over 8 time zones. We do what we can. It seems that Audacity thinks you are trying to open AAC (Advanced Audio Codec) files, which require ffMPEG. Your old files didn't suddenly change to AAC files. Something else has changed. First, please try resetting Audacity by following these instructions: ...