The subtitle "Render Resolution" setting was shown to every Android user
but only reached the ExoPlayer overlay; the mpv vo=mediacodec OSD plane
always rasterized at the full surface size. On a Fire TV Stick 4K Max
Gen 2 the edde746/plezy#2242 phone sign then cost up to 2 s of libass
render plus composite per frame at 1080p, showing late and lingering past
the cut.
Pass the fraction to the mpv core on initialize and give the OSD
SurfaceView a fixed buffer size below its view size; mpv rasterizes at
that size and the compositor scales the plane. At 1/2 the same sign
tracks its zoom at 12-24 updates/s and clears on the cut.
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