Proposed Encoders / Decoders Libraries

So far only following encoders / decoders libraries are supported:

> Update at 2020/11/24

**Video**

- [x] mp4 (x264)
- [x] mp4 (x265)
- [x] webm (libvpx)
- [x] ogv (theora)
- [x] mpeg-1 (native)
- [x] mpeg-2 (native)
- [x] aom (av1 / avif) (only in **next** version, see comments below)

**Audio**

- [x] mp3 (lame)
- [x] aac (fdk-aac)
- [x] wav/wv (wavpack)
- [x] ogg (vorbis)
- [x] opus (opus)
- [x] flac (native)

**Image**
- [x] gif (native)
- [x] webp (libwebp)

**Others**
- [x] font files (freetype)
- [x] *.srt, *.ass subtitle files (libass) (sample code [HERE](https://github.com/ffmpegwasm/ffmpeg.wasm/issues/138#issuecomment-820195878))

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If you there is any library you would like to add:
- If it already exists in the replies, simply give an emoji to upvote
- If it doesn't exist, you can reply this issue to propose.

I will check this issue periodically to decide which library to integrate next, or identify which is NOT possible to integrate at the moment.