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

[Paul B Mahol]

On 9/15/22, Dan <twinbee42 at skytopia.com> wrote:
>> You are right that datascope shows no difference. But the issue is also
>> reproducible with VLC player.
>
> As well as VLC Player and FFplay, I've tried MediaPlayerClassic, Google
> Chrome,
> Microsoft Edge and Vegas Pro, and the problem occurs with each of those.
> Could
> there be a "takes two to tango" thing going on, where both the players and
> ffmpeg
> are at fault due to miscommunication? It's somewhat hard to conceive they'd
> all
> interpret the file incorrectly otherwise. Only one player I tried -
> Irfanview - interpreted
> it correctly.
>
> I can't get to test it with Firefox or Waterfox unfortunately. They think
> the file
> is corrupt (output mp4 produced using the "-f lavfi -i
> color=0x19be0f:s=400x720" technique).
> Maybe there's a way around that.
>
> Also, showinfo produced an incorrect colour too. See:
> https://i.imgur.com/LF43udT.png
>
> (I use: "ffplay.exe -vf showinfo 576.mp4" ).

Looks like your knowledge is very limited, incorrect and completely
full of nonsense.

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.

Next time be less so ignorant and do some research and do read
documentation and do your homework before coming here asking for
questions.

It clearly shows that everything is unknown in that showinfo filter
output on messages on console thus everybody can pick whatever they
want to display video.

>
> In summary, I've love a workaround at least, or at least some reassurance
> that
> Chrome et al. will come round to fix this, or that ffmpeg will communicate
> the file

Nobody is wrong. Everybody is correct. Your file is encoded so badly
that it should be immediately removed from existence.

> better to them.
>
> Dan
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Whats about users that come here these days?

They show no sign of caring for details or knowledge.

They just want shortcuts and prompt solutions.

And clearly shows no incentive to change that anytime soon.