Support for configuring audio codec and video framerate

[llyyr]

Rebase #102

[ammen99]

A few things which I noticed after reading the PR again.

[ammen99]

LGTM now, thanks @llyyr for finishing up the work and thanks to @happysmash27 for the original work!

[llyyr]

Are there any plans to make a new release? I think it'd be a good idea

[ammen99]

Are there any plans to make a new release? I think it'd be a good idea

Yeah, but let's first give people some time to test this.

[apiraino]

Thanks for everyone working on this! Please let me know if I should file a separate issue.

Which are the possible values for -c, --codec and the new -C, --audio-codec? I've tried using --audio-codec=mp3 or --audio-codec=ogg but they both don't work. Maybe a couple of examples in the wiki to get people started?

If this depends on the local installation of ffmpeg, how can I discover what is supported on my machine (ffmpeg -codecs show all supported codecs from ffmpeg)?

[apiraino]

Ok, answering my own question.

To check all available audio encoders: ffmpeg -encoders 2>&1 | grep "^ A"

To check all available video encoders: ffmpeg -encoders 2>&1 | grep "^ V"

So for example one can now use: wf-recorder -a --codec libx264 --audio-codec=libvorbis

ref: #34