On 23.10.24 09:12, Diederick C. Niehorster wrote:
+ This decoder for DNxUncompressed video data is mostly based on
+ reverse engineering of output generated by DaVinci Resolve 19
+ but was later also checked against the SMPTE RDD 50 specification.
+
+ Not all DNxUncompressed pixel format variants are supported,
+ but at least an elementary base set is already usable:
+
+ - YUV 4:2:2 8/10/12/16bit/half/float (16bit untested)
+ YUV 4:4:4 8/16bit/half/float (all untested!)
+ - RGB 8/10/12/16bit/half/float (16bit untested)
+ Alpha/Y 8/16bit (all untested!)
That's not good...
[...]
Is your suggested to only include the cases that have been tested and
remove the rest? That would make sense, it seems other cases can be
added trivially once samples become available now that this groundwork
is done.
I'm also not happy about this pragmatic compromise to enable a few
variants only based on descriptions found in the specification without
any practical control by real world samples. I wasn't sure, if I should
enable the affected code paths at all, but at the end I got the feeling,
that it will be even more frustrating for users, if they choose one of
the provided exports variants in their preferred software, but ffmpeg
just displays an "unsupported" error message. That's why I finally
simply enabled all this untested common variants as well.
@Martin, is there any way you could get samples of the other formats?
Perhaps by downloading a trial version of acid media composer, or if
my google fu works well, by installing a codec pack
https://kb.avid.com/pkb/articles/en_US/Knowledge/Avid-QuickTime-Codecs-LE,w
hich should allow using these codecs in after effects and such.
I'm strictly working only on linux machines and do not have access to
windows or mac workstations and their software.
All the export variants available in DaVinci resolve are working (I just
have to upload a few more YUV float files to the Fate sample library for
completeness, but I didn't enable them in this patch set to not disturb
the patchwork results). That's anyway the majority of variants.
Only for the 16bit int, YUV 4:4:4 payload and Alpha channel usage I
couldn't figure out any working solution to generate samples by freely
accessible software on linux until now.
I was very surprised, that even on my Nuke-non-commercial 15.1 setup
DNxUncompressed is still not supported on linux -- even as an import
option. :(
But if I find a way to generate the additional samples or someone else
contributes them, I'll control the results and add them to the Fate tests.
martin
_______________________________________________
ffmpeg-devel mailing list
ffmpeg-devel@ffmpeg.org
https://ffmpeg.org/mailman/listinfo/ffmpeg-devel
To unsubscribe, visit link above, or email
ffmpeg-devel-requ...@ffmpeg.org with subject "unsubscribe".
