Publish a converter-oriented package variant (min-gpl + lame/opus/vorbis/vpx/webp/dav1d)

[vacoolstudio-rgb]

Summary

Media converters are stuck on full-gpl because it is the only package that has
both the GPL video encoders and the common audio/image encoders. That is a big
jump: full-gpl costs 20.4 MB of compressed arm64 payload where min-gpl
costs 9.2 MB, and a converter typically uses six of the ~34 extra libraries it
pays for.

Would you consider publishing one more variant — min-gpl plus
lame, opus, libvorbis, libvpx, libwebp, dav1d?

Why none of the existing eight works

need	provided by	in min-gpl?	in audio?	in video?
H.264 / H.265 encode	x264, x265	✅	❌	❌
MP3 encode	lame (no native encoder exists)	❌	✅	❌
Opus / Vorbis encode	opus, libvorbis	❌	✅	❌
VP9 encode (WebM)	libvpx	❌	❌	✅
WebP encode	libwebp	❌	❌	✅
AV1 / AVIF decode	dav1d	❌	❌	✅

The requirement spans all three, so full-gpl is the only option, and it also
brings an OCR engine, an AV1 encoder, the libass subtitle-rendering stack, TLS
and SRT.

Measurements

Sizes of the published AARs (whole artifact, all four ABIs):

variant	version	AAR
min	2.2.2	37.1 MB
min-gpl	2.2.2	46.4 MB
audio	2.2.2	48.9 MB
video	2.2.1	57.6 MB
full	2.2.1	66.6 MB
full-gpl	2.2.1	103.8 MB

Like-for-like on arm64 — the same set of .so (libav*, libsw*,
libffmpegkit, libc++_shared), deflate-compressed to approximate what Play
actually delivers:

	on disk	compressed
full-gpl	41.7 MB	20.4 MB
min-gpl	19.1 MB	9.2 MB

So the GPL video encoders are the cheap part; the remaining libraries more than
double the payload. Adding the six above to min-gpl should land around
12–14 MB compressed, roughly 8 MB off a Play download for anything that
converts media.

min-gpl's configuration, read from its own libavutil.so, for reference:
--enable-libvidstab --enable-libx264 --enable-libx265 --enable-libxvid --enable-mediacodec --enable-zlib.

Suggested configuration

--enable-gpl
--enable-x264 --enable-x265 --enable-libvpx
--enable-lame --enable-opus --enable-libvorbis --enable-libwebp
--enable-dav1d
--enable-android-media-codec --enable-android-zlib

Optionally --enable-libsoxr (better resampling) and --enable-iconv
(subtitle charset conversion); both are small.

A name like ffmpeg-kit-media or ffmpeg-kit-converter-gpl would describe it.

Context

Measured against ffmpeg_kit_flutter_new 4.3.2 →
com.antonkarpenko:ffmpeg-kit-full-gpl:2.1.0, in an offline photo/video/audio
converter that targets MP4/MKV/WebM/MOV/AVI/GIF, JPEG/PNG/WebP/BMP/TIFF and
MP3/M4A/WAV/FLAC/OGG/Opus. Happy to test a snapshot against that matrix if it
is useful.

Thanks for keeping this alive after the upstream archive — it is the reason a
lot of Flutter media apps still work.