#10780: Garbled output when doing colorspace conversion with zscale, since
recent
changes
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Reporter: Marth64 | Type: defect
Status: new | Priority: normal
Component: | Version:
undetermined | unspecified
Keywords: | Blocked By:
Blocking: | Reproduced by developer: 0
Analyzed by developer: 0 |
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**Summary of the bug:** Yesterday, a user on IRC #ffmpeg presented a
sample image and said that when they were trying to re-encode it as a
looping H265 video with some colorspace conversions, the output was
garbled. The specific claim was that the resulting video was a half-black
image, hiding most of the original source picture.
I was able to help the user verify this behavior and confirmed it was a
bug, at least had them to roll back to an older version where this
behavior does not exist.
This must have been recently introduced, since when I run from a build on
12-27 I was not able to reproduce the issue. So sometime between 12-27 and
1-4, this bug was introduced.
The user was kind enough to share the source image and give permission to
post it here. Attached files:
- colors2.exr - image from user
- output(latest).mkv - buggy output
- output(6.0.1).mkv - expected output
**How to reproduce:**
{{{
ffmpeg -loop 1 -t 10 -i colors2.exr -filter:v
'zscale=rangein=full:primariesin=709:transferin=709:matrixin=709:range=full:primaries=2020:transfer=smpte2084:matrix=2020_ncl'
-pix_fmt:0 yuv420p10 -colorspace:0 bt2020nc -color_primaries:0 bt2020
-color_trc:0 smpte2084 -color_range:0 pc -c:v libx265 -x265-params
lossless=1 OUTPUT.mkv
}}}
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Ticket URL: <https://trac.ffmpeg.org/ticket/10780>
FFmpeg <https://ffmpeg.org>
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