On 4/22/13, Al Crate <[email protected]> wrote: > On 22/04/13 10:22, Paul B Mahol wrote: >> On 4/22/13, Al Crate <[email protected]> wrote: >>> Hi all, >>> >>> I've been trying to explode a ProRes 444 movie to a sequence of 16bit >>> images. It would appear that this doesn't work as libswscale always >>> outputs non full chroma when converting YUV->RGB. >>> >>> Can someone confirm my suspicion ? >> >> What "outputs non full chroma" means? >>> >>> cheers >>> >>> al >>> >>> >>> >>> _______________________________________________ >>> Libav-user mailing list >>> [email protected] >>> http://ffmpeg.org/mailman/listinfo/libav-user >>> >> _______________________________________________ >> Libav-user mailing list >> [email protected] >> http://ffmpeg.org/mailman/listinfo/libav-user >> > > When you look at the output (converted to back YUV) you get 422 i.e. > half the expected number of UV samples. > > I suspect this piece of code in libswscale (util.c) might be the cause. > > Line 1031: > > /* reuse chroma for 2 pixels RGB/BGR unless user wants full > * chroma interpolation */ > if (flags & SWS_FULL_CHR_H_INT && > isAnyRGB(dstFormat) && > !isPlanarRGB(dstFormat) && > dstFormat != AV_PIX_FMT_RGBA && > dstFormat != AV_PIX_FMT_ARGB && > dstFormat != AV_PIX_FMT_BGRA && > dstFormat != AV_PIX_FMT_ABGR && > dstFormat != AV_PIX_FMT_RGB24 && > dstFormat != AV_PIX_FMT_BGR24 && > dstFormat != AV_PIX_FMT_BGR4_BYTE && > dstFormat != AV_PIX_FMT_RGB4_BYTE && > dstFormat != AV_PIX_FMT_BGR8 && > dstFormat != AV_PIX_FMT_RGB8 > ) { > av_log(c, AV_LOG_WARNING, > "full chroma interpolation for destination format '%s' > not yet implemented\n", > av_get_pix_fmt_name(dstFormat)); > flags &= ~SWS_FULL_CHR_H_INT; > c->flags = flags; > } > _______________________________________________ > Libav-user mailing list > [email protected] > http://ffmpeg.org/mailman/listinfo/libav-user >
Hmm, indeed, then open bug report. _______________________________________________ Libav-user mailing list [email protected] http://ffmpeg.org/mailman/listinfo/libav-user
