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

[Paul B Mahol]

On 9/15/22, Michael Koch <astroelectronic at t-online.de> wrote:
> Am 15.09.2022 um 13:43 schrieb Dan:
>> On Thu, 15 Sep 2022 12:07:08 +0100, Michael Koch
>> <astroelectronic at t-online.de> wrote:
>>
>>> Am 15.09.2022 um 11:53 schrieb Dan:
>>>>> This seems to work with VLC player:
>>>>>
>>>>> ffmpeg -f lavfi -i color=0x19be0f:s=400x576 -colorspace bt709 -crf 0
>>>>> -vcodec libx264 -t 5 -y out1.mp4
>>>>> ffmpeg -f lavfi -i color=0x19be0f:s=400x578 -colorspace bt709 -crf 0
>>>>> -vcodec libx264 -t 5 -y out2.mp4
>>>>
>>>> Unfortunately, doesn't work for me in MPC or Chrome. Can you try a
>>>> height of 720 instead of 578 to see if that fails for you?
>>>
>>> Please try this, for me it works with VLC player, the color is exactly
>>> the same:
>>>
>>> ffmpeg -f lavfi -i color=0x19be0f:s=400x576 -colorspace bt709
>>> -color_primaries bt709 -color_trc bt709 -crf 0 -vcodec libx264 -t 5 -y
>>> out1.mp4
>>> ffmpeg -f lavfi -i color=0x19be0f:s=400x720 -colorspace bt709
>>> -color_primaries bt709 -color_trc bt709 -crf 0 -vcodec libx264 -t 5 -y
>>> out2.mp4
>>
>> Sure.
>>
>> The colour is both the same now (for both Chrome and MPC), except it's
>> the darker, wrong colour (green=164 instead of 190).
>
> Try some other values instead of "bt709".

MIssing -color_range when encoding?

yuvj is full range.

>
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