[FFmpeg-user] datascope 16-bit

[list+ffmpeg-user at jdlh.com]

On 2022-11-19 07:34, Michael Koch wrote:
> Am 03.11.2022 um 10:10 schrieb Paul B Mahol:
>>
>> Some things in sea of myriad others:
>> [...]
>> Why you claim that datascope does not support >8 bit formats where in
>> fact it does support it?
>
> In some cases datascope works with 16-bit data, but not in all cases.
> Here is an example where it doesn't work:
>
> ffmpeg -f lavfi -i color=black:s=32x32,format=gray10le -lavfi 
> geq=lum='X+32*Y',format=gray10le -frames 1 -y test.png
>
> ffmpeg -i test.png -vf 
> format=rgb48,showinfo,datascope=s=1280x1152:mode=color2:format=hex -y 
> out.png
>
Perhaps clarify what you observe as "doesn't work", and what behaviour 
you expect?

Both those commands run for me without error, and I can view both 
test.png and out.png without problem. out.png has a cascade of 32 
2-digit hex numbers on the left half, and solid black on the right half. 
The hex numbers run from 00 to 7F, in white on a black to grey gradient 
background, and from 80 to FF, in black on a grey to white background.

Tested on ffmpeg version 4.4.2 as distributed via MacPorts, on macOS 
12.6 Monterey. And I don't know anything about how datascope is supposed 
to work; <http://ffmpeg.org/ffmpeg-all.html#datascope> does not say much 
about it.