Am 27.06.2024 um 08:57 schrieb Paul B Mahol:
On Thu, Jun 27, 2024 at 8:45 AM Michael Koch <astroelectro...@t-online.de>
wrote:
Am 26.06.2024 um 23:43 schrieb Oliver Fromme:
Hi,
I'm using ffmpeg for a long time, but I've just recently started to
use it with 10bit HDR (HDR10) video.
So far I found out how to re-encode HDR10 video with libx265 and
retain the HDR metadata. It's a bit complicated, but it seems to
work fine. However, I'm unsure about video filters.
In particular, I often use the atadenoise filter. It works really
well for 8bit SDR video. But can it be used with HDR10 video, too?
Can I simply add ''-vf atadenoise`` to the command and it'll work,
or will it clip the data down to 8bit?
You can make a test to check if a filter chain is 10-bit compatible.
Make a test image (or video) with 1024 levels of gray in a 32x32 grid.
Then apply the filterchain to this test image.
Then apply strong contrast enhancement to the output video. If there was
a hidden truncation to 8-bit, then there will be only 8 levels of gray
in X direction.
Described in chapter 2.201 in my book:
http://www.astro-electronic.de/FFmpeg_Book.pdf
According to my test, atadenoise is 10-bit compatible.
Be aware that this book spreads countless statements that are either:
- misinformation
- malinformation
- disinformation
- untrue
- invalid
- unconfirmed
- typo
- broken
- never worked
Anybody who finds something wrong can just let me know.
My contact information is on the first page.
- was correct >X months ago
Yes, unfortunately there are several things that worked fine months or
years ago, but now don't work any more.
Michael
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