bestaudio webm remux to .opus/.ogg container

[nwgat]

What is the purpose of your issue?

• Bug report (encountered problems with youtube-dl)
• Site support request (request for adding support for a new site)
• Feature request (request for a new functionality)
• Question
• Other

Description of your issue, suggested solution and other information

when i run with -f bestaudio, the output format is webm, even when the stream is audio only

i propose this
if stream is opus then remux to .opus container
if stream is vorbis then remux to .ogg container
if stream is m4a then keep m4a container

webm isnt supported on a whole lot of audio players, but both opus and vorbis are

[ubone]

-xf bestaudio

[yan12125]

Thanks @ubone. The feature is indeed already there for a long time. There was something wrong in my head :D

[Popke523]

-xf doesn't work for me, with bestaudio downloads aac, with 251 downloads opus but still in webm container. Here is my command:
youtube-dl https://www.youtube.com/user/NoCopyrightSounds -xf 251 -i -o "%(title)s.opus"

[yan12125]

The correct command is:

youtube-dl H81DzDMdCLI -xf 251 --audio-format opus -o "%(title)s.%(ext)s"

Feel free to ask on IRC if you've got other questions.