On Sun, Sep 13, 2020 at 01:23:25PM -0700, Dan Dennedy wrote: > On Sun, Sep 13, 2020 at 9:00 AM amin...@mailbox.org <amin...@mailbox.org> > wrote: > > > > On Thu, Jul 30, 2020 at 3:09 PM Tom Murphy <amindfv@...> wrote: > > > > > > > > According to ffprobe, the input video has colorspace 'yuv420p10le' > > > > > (i.e. 10-bit video), but the output is only 'yuv420p'. So it does > > > > > appear somewhere in the pipeline it's being downgraded to 8-bit? (Or > > > > > that there's a default 8-bit output setting somewhere?) > > > > > > > > > > > > > Maybe I should have phrased this last bit more clearly as a question: > > > > does the fact it's input 10-bit and output 8-bit imply I _can't_ > > > > currently get the data through the whole pipeline 10-bit > > > > > > > > > > Correct. Brian meant it should support it as an input and decode it > > > correctly, but it will be conformed to one of the image formats supported > > > by the services. The mlt_image_yuv422p16 he mentions only works for > > > decklink producer to avformat consumer currently. It also possible to > > > convert 10-bit YUV to 8-bit full range sRGB, which most effects support, > > > convert to 10-bit YUV, and encode as 10-bit. I think Brian was also > > talking > > > a bit technical about what can be possible with small changes if you are > > a > > > developer. Currently, the avformat producer (decoder) does not output to > > > mlt_image_yuv422p16, and I doubtful that is going to be the preferred > > image > > > format for a future processing pipeline that supports 10-bit end-to-end. > > > > Is my intuition correct that (e.g.) 10-bit yuv420 needs to be supported on > > a per-service basis? > > > > So if I have 10-bit color producers and no filters or transitions, then > > "all" I need is for the avformat consumer to support 10-bit color in order > > to prevent loss of image quality? > > > > > The consumer already supports mlt_image_yuv422p16 but not the avformat > producer. > > > > And then, if I have the same setup as above but I add one filter (or > > transition), then I just need that particular filter or transition to > > support 10-bit color? > > > > > That is correct, but beware of automatically-added normalization filters > that are added in src/modules/core/loader.ini for things such as scaling > and padding, etc.
ffmpeg has options like -auto_conversion_filters [0] and "-pix_fmt +" [1] to explicitly disallow accidental conversions between formats and color spaces. Is there an option for this in MLT? Thanks! Tom [0] https://ffmpeg.org/ffmpeg.html#Advanced-options [1] https://ffmpeg.org/ffmpeg.html#Advanced-Video-options _______________________________________________ Mlt-devel mailing list Mlt-devel@lists.sourceforge.net https://lists.sourceforge.net/lists/listinfo/mlt-devel
