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.
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