I have been waiting very, very, very patiently for the next release of audacity to come out.
Now that i have upgraded from 2.0.5 to 2.0.6 i have found that the FFmpeg v2.2.2 for Audacity on Windows
seems to have a bug in it when it comes to saving audio files (exporting) in Opus format.
The files are empty i.e. are 0 bytes in file size.
I have checked the internet via google for all references to ‘audacity’ and ‘opus’, and my conclusion is that there seems
to be very little involement/interest in supporting .Opus, the free alternative to AAC, HE-AAC v1, HE-AAC v2.
Can somebody in the Audacity DEV Department please corroberate this ?
Show All Formats: Show All Codecs:
If ‘ffm’ in the FIRST column (under ‘Show All Formats’) is selected:
Format: ffm - FFM (FFserver live feed) Codec:  libopus - Opus
The only fields that are NOT greyed out are:
I have tryed the follow data in fields:
TAG - Left empty
Sample Rate: 44100
PC: AMD Hex-Core
RAM: 8 GB
OS: Windows 8.1 Pro (x64)
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Opus (and Speex) exports do not work using “FFmpeg Custom Export”. That whole dialogue is very buggy. We may be in future be moving to GStreamer instead of FFmpeg so there is not a great deal of motivation to address the issues in that dialogue.
What you need to do is choose “(external program)” instead. Assuming you used the installer for FFmpeg and did not change the installation path, enter this command:
ffmpeg -i - -acodec libopus "%f"
Then type your file name normally, except add the “.opus” extension (without quotes) after the end of the file name. For example: