[FFmpeg-user] ffmpeg MP4/x264 output colours change when input source is different resolution (bug?)

[Michael Koch]

Am 16.09.2022 um 16:34 schrieb Dan:
> On Fri, 16 Sep 2022 14:55:20 +0100, Michael Koch 
> <astroelectronic at t-online.de> wrote:
>
>> Am 16.09.2022 um 15:20 schrieb Dan:
>>>> showinfo filter shows video frame color metadata to output of console,
>>>> nothing less - nothing more. showinfo cant produce incorrect video, if
>>>> you ever bothered to read documentation you would know.
>>>
>>> By the way, just to clarify, I wasn't talking about the console
>>> output, but
>>> the window it opened up alongside (on the right), which showed the 
>>> green
>>> was darker.
>>>
>>>> Nobody is wrong. Everybody is correct. Your file is encoded so badly
>>>> that it should be immediately removed from existence.
>>>
>>> In the end, I used "-colorspace fcc" which seems to have fixed the 
>>> issue.
>>
>> Please show your complete command line. Because for me it doesn't work.
>> Different colors for height 576 and 720.
>
> Sure:
>
> ffmpeg.exe -f lavfi -i color=0x19be0f:s=400x720 -crf 0 -vcodec libx264 
> -t 5 -y -colorspace fcc 720fcc.mp4
>

For me that doesn't work in Windows. The color in VLC player is 
18,190,18 for height=576 and 13,163,11 for height=720.
It doesn't help if I specify -color_trc, -color_primaries and -color_range.

In VLC player are functions Tools / Media Information and Tools / Codec 
information. What's shown here is exactly the same for height=576 and 
height=720. But the colors are different.

Michael