[FFmpeg-trac] #7037(undetermined:new): ffmpeg destroys HDR information when encoding
FFmpeg
trac at avcodec.org
Thu Feb 22 01:31:59 EET 2018
#7037: ffmpeg destroys HDR information when encoding
-------------------------------------+-------------------------------------
Reporter: mario66 | Type: defect
Status: new | Priority: important
Component: | Version: git-
undetermined | master
Keywords: hdr | Blocked By:
Blocking: | Reproduced by developer: 0
Analyzed by developer: 0 |
-------------------------------------+-------------------------------------
Summary of the bug:
Hi,
I have a new 4k bluray with a 10 bit HDR movie and I now want to convert
it to 1080p with x265, but keep the HDR.
I downloaded a ffmpeg binary build against 10 bit x265 and started the
conversion with '-vf "scale=1920x1080"' option. While the resultsing video
is indeed encoded with the Main10 profile, the video itself looks dull and
as if the HDR information was lost. I notice that metadata changed.
In the original video, there are the following tags:
{{{
colour_range : Limited
colour_primaries : BT.2020
transfer_characteristics : PQ
matrix_coefficients : BT.2020 non-constant
MasteringDisplay_ColorPrimaries : R: x=0.680000 y=0.320000, G:
x=0.265000 y=0.690000, B: x=0.150000 y=0.060000, White point: x=0.312700
y=0.329000
MasteringDisplay_Luminance : min: 0.0050 cd/m2, max:
4000.0000 cd/m2
MaxCLL : 500 cd/m2
MaxFALL : 200 cd/m2
}}}
In my new video, these are not included any more. I consider this to be a
BUG because I never told ffmpeg to mess with color spaces etc. therefore
ffmpeg should just leave everything as it is including the metadata.
How to reproduce:
{{{
% ffmpeg -i in.mkv -vf "scale=1920x1080" -map 0:v -map 0:a? -map 0:s? -c:v
libx265 [-pix_fmt yuv420p10le] -c:a copy -c:s copy out.mkv
}}}
The argument in square brackets is an alternative I tried but the result
is the same.
Version:
ffmpeg-20180220-a877d22-win64-static
--
Ticket URL: <https://trac.ffmpeg.org/ticket/7037>
FFmpeg <https://ffmpeg.org>
FFmpeg issue tracker
More information about the FFmpeg-trac
mailing list