[FFmpeg-devel] [PATCH v2] avfilter/vf_showinfo: Fix erroneous results for mean and stdev with pixel bits >8

[Michael Niedermayer]

On Thu, Nov 28, 2019 at 10:34:41PM +0800, lance.lmwang at gmail.com wrote:
> From: Limin Wang <lance.lmwang at gmail.com>
> 
> The following is one of the testing results, you can observe the result of 16bit isn't correct.
> 1, yuv420p
> ./ffmpeg -f lavfi  -i color=black:duration=1:r=1:size=1280x720,format=yuv420p,showinfo
> Master:
> mean:[16 128 128] stdev:[0.0 0.0 0.0]
> After applied the patch:
>  mean:[16 128 128] stdev:[0.0 0.0 0.0]
> 

> 2, yuv420p10
> ./ffmpeg -f lavfi  -i color=black:duration=1:r=1:size=1280x720,format=yuv420p10,showinfo
> Master:
> mean:[32 1 1] stdev:[32.0 1.0 1.0]
> After applied the patch:
> mean:[64 512 512] stdev:[0.0 0.0 0.0]

with >8bit, both little and big endian formats should be tested

thx

[...]
-- 
Michael     GnuPG fingerprint: 9FF2128B147EF6730BADF133611EC787040B0FAB

Frequently ignored answer#1 FFmpeg bugs should be sent to our bugtracker. User
questions about the command line tools should be sent to the ffmpeg-user ML.
And questions about how to use libav* should be sent to the libav-user ML.
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