Audacity Forum

The last 4 lines of the log file, on a machine with macOS 10.8 and FFmpeg library installed: 23:42:46: File name is /Volumes/was/tmp/test/0-Jingle-0.m4a 23:42:46: Mime type is * 23:42:46: Opening with libav 23:42:46: Open(/Volumes/was/tmp/test/0-Jingle-0.m4a) ...

Audacity can open up a lot of different found files, but if you find one that doesn't work, you may need to install the FFMpeg plug-in. That expands Audacity's dance card to a large number of different files.

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http://www.audacityteam.org/download/windows/

Koz

... in the track control panel.) On macOS – in contrast to Linux and Windows – ALAC and AAC files are decoded by means of the operating system; the FFmpeg library is not required. At least, that's how I understand it. Could it be that the bug is rooted here and is macOS-specific? Yet there is – ...

... still get the same error. I've also tried running sudo ../configure CXXFLAGS=”-std=gnu++11″ --with-lib-preference="local system" --with-ffmpeg="system" --disable-dynamic-loading I still get the same error; the full log is as follows: checking for a BSD-compatible install... ...

... load dynamic library 'avformat-55.dll' (error 126: can not find the specified module.) That's just saying that you don't have the optional "FFMpeg" installed. (avformat is part of FFMpeg). I receive an error of "orphan files" That's saying that Audacity has detected some audio ...

Audacity will cheerfully open the audio section of many video formats and edit the sound (sometimes with the addition of the FFMpeg software), but we can't put it back. You need a video editor that can manage individual video and audio services. And once you have the editor, it's sometimes ...

... 14:01:32: Audacity 2.0.5 14:01:34: Warning: Critical Nyquist files could not be found. Nyquist effects will not work. 14:01:36: Retrieving FFmpeg library version numbers: 14:01:36: AVCodec version 0x362301 - 54.35.1 (built against 0x362300 - 54.35.0) 14:01:36: AVFormat version 0x361404 ...

... show: 10:27:34: Audacity 2.0.5 10:27:35: Warning: Critical Nyquist files could not be found. Nyquist effects will not work. 10:27:37: Retrieving FFmpeg library version numbers: 10:27:37: AVCodec version 0x362301 - 54.35.1 (built against 0x362300 - 54.35.0) 10:27:37: AVFormat version 0x361404 ...

I don't use M4A myself, but from the Release Notes: M4A (AAC) exports: The Quality Slider in "Specify AAC Options" has no effect if the FFmpeg library is built with the libvo-aac encoder, as are recommended builds of FFmpeg for Windows and Mac OS X. Workaround: You can specify a constant ...

... FLAC_LIBS="-L/usr/local/Custom/flac/lib -lFLAC -lFLAC++" \ ./configure --prefix=/usr/local/Custom/audacity --with-ffmpeg --with-lame --with-libid3tag --with-libmad --with-sbsms --with-libsndfile --with-soundtouch --with-libsoxr --with-libtwolame --with-libvorbis ...