[FFmpeg-trac] #7037(avcodec:open): ffmpeg destroys HDR metadata when encoding
FFmpeg
trac at avcodec.org
Sun Jan 19 13:21:50 EET 2020
#7037: ffmpeg destroys HDR metadata when encoding
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Reporter: mario66 | Owner: cehoyos
Type: enhancement | Status: open
Priority: normal | Component: avcodec
Version: git-master | Resolution:
Keywords: libx265 hdr | Blocked By:
Blocking: | Reproduced by developer: 0
Analyzed by developer: 0 |
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Comment (by mario66):
I appreciate that you start to care about the average end user who is not
so familiar with color spaces. Indeed, as Balling suggested, even for SDR
videos tags like "colour_primaries=BT.709" are present, and they are lost
after transcode!
Now I'm not sure if this is even a problem because TVs could assume this
as the default color space, but still it is a scary thought that all my
transcoded videos are destroyed by missing color information. For example
what happens if I buy a new TV that does not assume BT.709 as the default?
Will I be even able to watch the videos without huge shift in color space?
I think this topic has too long been ignored. Color management experts
like you always knew how to tweak those options, but 99,9% of end users
did not. I did not find any reference to this missing meta data problem in
any guides on how to transcode a Blu Ray video. I think this is not known
to the general public. I'm always eager to learn new things but there are
always things even I do not know that I do not know them. The "unknown
unknowns". There is no chance to learn them if no one writes about this.
There is a lot of room for improvements in documentation, and I would be
very happy if this would also be a result of our interesting discussion. I
tried to trigger something with this ticket:
https://trac.ffmpeg.org/ticket/8482 but was closed by my fried "cehoyos"
who has no interest in improving this project.
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Ticket URL: <https://trac.ffmpeg.org/ticket/7037#comment:70>
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