[FFmpeg-devel] Bug in YUV decoder

[Ben Hutchinson]

Doesn't SDL support YUV444 as a YUV format? Or does it only support YUV420?
Also, thanks for the tip about -vf format=bgra

On Fri, Mar 15, 2019 at 1:00 AM Gyan <ffmpeg at gyani.pro> wrote:

>
>
> On 15-03-2019 12:05 PM, Ben Hutchinson wrote:
> > Note that it does not matter what pixel format the encoder uses (j or
> > non-j). This bug is only present in the decoder, and only when I select
> the
> > non-j version of a yuv pixel format. This bug is present in the ffplay
> > decoder (possibly also in the ffmpeg decoder, but I've not yet tested
> that).
>
> Suspected bugs should be reported at trac.ffmpeg.org
>
> This is not a decoder bug. ffplay uses SDL to render video; SDL supports
> a limited number of YUV texture formats. So, most YUV inputs are
> converted to yuv420p. Due to how the format negotiation happens, the
> YUVJ formats are converted to BGRA for display, which is of course, not
> subsampled. To emulate the same result with yuv444p, modify ffplay
> command to,
>
>      ffplay -f rawvideo -pix_fmt yuv444p -framerate 10 -vf format=bgra -s
> 640x480 -
>
>
> Decoder bugs are best tested with some type of framehash muxer.
>
>
> Gyan
>
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