[FFmpeg-trac] #9167(undetermined:closed): Color changed when an image converting to video
FFmpeg
trac at avcodec.org
Wed Mar 31 08:17:59 EEST 2021
#9167: Color changed when an image converting to video
-------------------------------------+-------------------------------------
Reporter: kvsico | Owner:
Type: defect | Status: closed
Priority: normal | Component:
| undetermined
Version: unspecified | Resolution: invalid
Keywords: | Blocked By:
Blocking: | Reproduced by developer: 0
Analyzed by developer: 0 |
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Comment (by kvsico):
Replying to [comment:22 pdr0]:
> Replying to [comment:21 kvsico]:
>
> >
> > After using libx264rgb, I have another problem: Chorome can't play the
video file libx264rgb.mp4, it shows a black video, here is my cmd:
> >
> > ffmpeg -y -t 4 -loop 1 -i 1.png -c:v libx264rgb libx264rgb.mp4.
> >
>
>
>
> If it's for chrome, chrome does not have a 10bit pipeline yet either, so
there is no benefit
>
> You would have to either use Balling's suggestion , or use a "normal"
709 conversion for AVC. Eitherway, if you test a bunch of colors, they
will be off slightly from expected rounding errors during the 8bit
RGB=>YUV=>RGB round trip
>
>
> "normal" 709
> ffmpeg -y -t 4 -loop 1 -i 1.png -vf out_color_matrix=bt709 -x264opts
colormatrix=bt709 709.mp4
>
> Balling's suggestion
> ffmpeg -y -t 4 -loop 1 -i 1.png -color_primaries bt709 -color_trc
iec61966_2_1 -colorspace smpte170m 2.mp4
>
> You might be able to use VP9 in RGB mode, not sure if chrome supports
it, I'll check later
ffmpeg -y -t 4 -loop 1 -i 1.png -vf out_color_matrix=bt709 -x264opts
colormatrix=bt709 709.mp4, this command throw error `No such filter:
'out_color_matrix'` , so I changed to
ffmpeg -y -t 4 -loop 1 -i 1.png -vf scale=out_color_matrix=bt709
-x264opts colormatrix=bt709 709.mp4, then 709.mp4 generated successfully.
I tested 709.mp4 and 2.mp4
from the two commands, their color is #ee4d2c and have same color as
1.png, this problem is solved, thanks to all of you.
--
Ticket URL: <https://trac.ffmpeg.org/ticket/9167#comment:25>
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