HEVC files played through the mpv backend on the Nvidia Shield show a
solid blue screen with audio: under hwdec=mediacodec, gpu-next samples
the decoder output as a samplerExternalOES that libplacebo declares in
both shader stages, and the Tegra GLES linker rejects the pair ("struct
type mismatch between shaders for uniform"), failing every frame. The
in-chain gpu fallback never engages because gpu-next initializes fine,
and mpv/libplacebo master reproduce it unchanged.
DV reshaping — the reason gpu-next exists on Android — only happens
under software decode, so offer gpu-next exactly there and keep the
legacy gpu VO for hardware sessions on both the primary mpv backend and
the ExoPlayer fallback core.
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