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They were used at some point, but then fell into disuse. In general, these old flags are all a bit fuzzy, so it's a good idea to remove them as much as possible. The comment about MP_IMGFLAG_PAL isn't true anymore. The old meaning was deprecated at some point, and the flag was removed from "pseudo paletted" formats. I think mpv at one point changed its own flag from AV_PIX_FMT_FLAG_PSEUDOPAL to AV_PIX_FMT_FLAG_PAL, when the former was deprecated, and it became unnecessary to allocate a palette for non-paletted formats. (The one who deprecated in FFmpeg was me, if you wonder.) MP_IMGFLAG_PLANAR was used in command.c, use a relatively similar flag as replacement.