question about audio quality and --metadata-from-title

[Skarbor9]

Make sure you are using the latest version: run youtube-dl --version and ensure your version is 2018.07.29. If it's not, read this FAQ entry and update. Issues with outdated version will be rejected.

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Description of your issue, suggested solution and other information

What exactly hides behind --audio-quality 0-9 levels? What exactly is 0 and default 5 level, or should I choose sampling rate and bitrate by myself? I'm talking about vorbis -> flac conversion.

Is there any list with all --postprocessor-args possible?

Is that correct command for metadata from title? Do I need a path to the folder from --output, or these strings only?:
--metadata-from-title "%(title)s - %(acodec)s-%(abr)s-%(vcodec)s-%(resolution)s-%(format)s-%(like_count)s-%(dislike_count)s-%(view_count)s-%(upload_date)s-%(uploader)s-%(uploader_id)s.%(ext)s"

[dstftw]

--audio-quality is mapped to ffmpeg's -qscale:a and it's format specific. Consult ffmpeg doc for more info on it's values.
--postprocessor-args is postprocessor specific.
--metadata-from-title is for fetching additional metadata from title, it has nothing to do with folders.

[Skarbor9]

There is nothing about values here https://ffmpeg.org/ffmpeg.html , only information that something like -qscale exists.
My example of --metadata-from-title is correct, or not?

[ravkr]

just learn how to use google....
and how to use markdown on github: it's [x], not [ x]

• good
• [ x] bad
• [x ] bad

[rautamiekka]

Here's the full FFmpeg documentation: https://www.ffmpeg.org/ffmpeg-all.html (FFmpeg maintains 2 sets of documentation for each of the programs (ffmpeg, ffplay, ffprobe): the 'all' and the small. You'll always want the 'all')