Better documentation (HOWTO?) of ff* wrappers in GPAC

[rbouqueau]

GPAC leverages FFmpeg libraries. However there is:

• No documentation (e.g. HOWTO) page explaining how to leverage FFmpeg's capabilities from GPAC.
• The option parsing with :gpac: or :: (to force options to be parsed all at once) or finding custom names (e.g. ``avfoundationorffmt=```) need to be documented.

[jeanlf]

No documentation (e.g. HOWTO) page explaining how to leverage FFmpeg's capabilities from GPAC.

we have a specific section in the one-liner, if not enough add an issue in the wiki repo

The option parsing with :gpac: or :: (to force options to be parsed all at once) or finding custom names (e.g. ``avfoundation or ffmt=```) need to be documented.

the generic escape mechanism is documented in http://wiki.gpac.io/Filters/filters_general/#specifying-encoders-and-decoders, the URL escaping in http://wiki.gpac.io/Filters/filters_general/#generic-declaration

The only specific case which almost always require escaping is ffavf.f option, and this is documented here:
http://wiki.gpac.io/Filters/ffavf/#declaring-a-filter

[rbouqueau]

I propose that someone, not you, writes something. Is it an issue to leave it here? We could tag some issues as 'documentation' for instance?

[jeanlf]

since we have a repo for the wiki I'd rather move doc issues on the wiki

[rbouqueau]

Right. Done.