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sws_scale_frame (used since 17.0.0) validates color_trc/color_primaries and rejects RESERVED and other unsupported values (e.g. LOG) with EOPNOTSUPP, regressing plain reformat/to_ndarray to rgb24 on VP9 and NVDEC frames. The pre-17.0 sws_scale ignored these fields. Neutralize color_trc/color_primaries to UNSPECIFIED for the scale unless a destination value is explicitly requested, while preserving the source's tags on the returned frame. The YUV->RGB matrix and explicit conversions are unaffected.
in_stream now takes a Stream, a Codec, a codec-name str, or None. A Stream still copies the full input codec parameters, while a Codec or name only pins par_in->codec_id/codec_type, which is enough for codec-specific filters to initialize (filters that also need extradata still require a Stream). Also corrects the AVBSFContext.par_in/par_out declarations to non-const to match FFmpeg's header.
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