[FFmpeg-trac] #9167(undetermined:closed): Color changed when an image converting to video
FFmpeg
trac at avcodec.org
Tue Mar 30 20:41:04 EEST 2021
#9167: Color changed when an image converting to video
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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 pdr0):
Replying to [comment:3 Balling]:
> Replying to [comment:1 pdr0]:
> >
> > Not a bug.
> >
> > 8bit RGB vs. 8bit YUV
>
> No, it has nothing to do with this. Anyway, I could not even launch the
command, the png is too big...
It has something to with that
You can -vf scale...
You're assuming that he's using a different matrix for playback ?
One possible difference is the matrix used for YUV<=>RGB, but even if you
use the correct matching matrix for both directions (and back to RGB for
display), you will still get slightly off colors
You will usually not get exact colors from 8bit RGB with 8bit YUV because
the color models do not overlap perfectly and you will get rounding errors
+/-3, even with correct matching matrix transform YUV<=>RGB in either
directions
ffmpeg -y -t 4 -loop 1 -i 1.png -vf scale=1302:2183:out_color_matrix=bt709
3.mp4
It's closer, but still off
RGB 238,77,45
3.mp4 (8bit YUV444) converted to RGB with 709 RGB 239,78,44
2.mp4 (libx264rgb) RGB 239,77,45
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Ticket URL: <https://trac.ffmpeg.org/ticket/9167#comment:4>
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