Provide autocomplete for known codecs

[voxxit]

It would be very useful to have a feature that allows users to:

• View a complete list of available codecs (audio, video, etc.) within the library.
• See configurable options and parameters for each codec.
• Benefit from autocompletion and inline suggestions when specifying codecs and their options within input/output configuration.

Why?

• Improves discoverability of supported codecs and their capabilities.
• Reduces manual lookup in FFmpeg or external documentation.
• Makes the library more user-friendly, especially for new users or those working with complex filter graphs.

Proposed Solution:

• Scrape the API(s) or methods via the codecs to enumerate all codecs and their options.
• Integrate autocompletion into relevant input/output nodes.
• Consider exposing this information both via Python, too :)

This could be modeled after how ffmpeg -codecs and ffmpeg -encoders/-decoders output their lists.
Autocompletion could be IDE-compatible (e.g., using Python typing or plugin hooks).

I went ahead and scraped/made llms.txt out of the codecs page. Don't know how useful that'd be for you or others, but it's there :)

llms-full.txt

[lucemia]

Cool idea — definitely a useful feature! I haven’t thought deeply about how to implement it yet, but this is something I’d consider for the next major release. Appreciate you putting together llms.txt as well — that’ll be helpful when exploring this further!