On Tue, Nov 10, 2020 at 01:51:22AM +0000, Brian Matherly wrote: > > > On Monday, November 9, 2020, 03:24:43 AM CST, amin...@mailbox.org > <amin...@mailbox.org> wrote: > > On Sat, Nov 07, 2020 at 03:13:49PM +0000, Brian Matherly wrote: > > > Thanks. > > > > > > Is there an easy way to list (or find) which formats are supported -- > > > and thus don't require conversions -- for inputs and outputs of > > > filters/transitions? > > > > > > Tom > > > > I think the only way would be to audit the source code and see what mlt > > image format the service requests. > > ~Brian > > Am I (at all) on the right track here?: > > Yes! > > This code seems to say the avformat producer supports rgba, rgb24, and > yuv422p? > https://github.com/mltframework/mlt/blob/master/src/modules/avformat/producer_avformat.c#L614-L630 > > This is a better place to look: > https://github.com/mltframework/mlt/blob/master/src/modules/avformat/producer_avformat.c#L1167rgba, > rgb24, yuv420p, yuyv422
Got it, thanks! So AVPixelFormat is the ffmpeg(?) pixel format, and mlt_image_format is the type actually used by MLT services (or, at least, by filters and transitions)? The definition of mlt_image_format (https://github.com/mltframework/mlt/blob/master/src/framework/mlt_types.h#L45-L58) seems to have only mlt_image_yuv422p16 as a candidate capable of supporting 10-bit color; is that right? All the rest (excluding glsl which I haven't explored) seem to only be 8-bit? And also is my math right that it is in fact able to support 10(+) bits of color? - i.e. 2 chroma-subsampled pixels have (32 bpp*2==64) bits of color information, divided by 4 (2 Y + 1 Cr + 1 Cb) == 16 bits per component? A simpler way of saying this might be: the ffmpeg naming scheme for e.g. "yuv422p10le" is the same as MLT's naming scheme for "yuv422p16", thus since 16 is greater than 10, we can definitely losslessly use 10-bit colors (in services that support 16-bit colors)? Thanks! Tom _______________________________________________ Mlt-devel mailing list Mlt-devel@lists.sourceforge.net https://lists.sourceforge.net/lists/listinfo/mlt-devel
