[FFmpeg-user] datascope 16-bit

[Michael Koch]

Am 20.11.2022 um 02:39 schrieb 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.

I would expect 4-digit hex numbers, because the rgb48 pixel format is 
16-bit per channel.
For example, it works fine if "rgb48" is replaced by "gray16".

Michael