0a54f96a44
This uses the existing optional runtime ffmpeg dependency to add support for m4a files (and in theory whatever other file formats ffmpeg supports) to the import audio dialog. The same functionality is mostly already available via Session -> Open Video, with the "import audio only" selection (even though m4a isn't currently included as one of the video formats, it still works). Having this in the import audio dialog however seems much more user friendly.
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