swscale: map VLC_CODEC_YUV420/422A to AV_PIX_FMT_YUVA420/422P
They are the same chroma format.
They were introduced in c7b8f0b8. Maybe at this time libavutil didn't have these new chroma.
They are the same chroma format.
They were introduced in c7b8f0b8. Maybe at this time libavutil didn't have these new chroma.
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