[FFmpeg-user] Colour metadata not preserved when re-encoding ProRes/mov to FFV1/mkv

Kieran O Leary kieran.o.leary at gmail.com
Wed Jul 25 16:02:09 EEST 2018

Hi Tobias,

On Wed, Jul 25, 2018 at 1:21 PM, Tobias Rapp <t.rapp at noa-archive.com> wrote:
> On 25.07.2018 10:04, Peter B. wrote:
>> Hi Reto,
>> On 24/07/18 21:47, Reto Kromer wrote:
>>> We do rewrap ProRes into Matroska. Which is the reason for transcoding
>>> it to FFV1?
>> ...I guess the usual "way out" of proprietary formats?
>> As well as format normalization (to have less mixed codecs).
> I agree that format normalization towards a loss-less codec ensures that
> content will be accessible now and in the future in a more reliable way.
> Keeping multiple codecs requires maintenance workload for multiple decoders.
> Back to the original topic of preserving color metadata: I also stumbled
> over this issue and if I remember correctly there have been multiple
> attempts to fix this but unfortunately none of them got enough attraction /
> guidance to be accepted into the FFmpeg code-base.
> For example:
> https://ffmpeg.org/pipermail/ffmpeg-devel/2018-February/225512.html
> https://ffmpeg.org/pipermail/ffmpeg-devel/2018-May/230139.html
Thanks so much for your feedback. That patch completely passed me by
at the time. I might try to apply, test it out and reply to that
thread in the hope that it will generate some momentum.

> Luckily in my workflows I have all the properties in some "media format"
> parameter-set besides the media file so I just manually add the right flags
> on the encoder side instead of depending on them being forwarded correctly.
I think that this is what we might do in the short term. Determine the
key metadata within the source file and stipulate the values when
necessary in the destination file.



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