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

[Tobias Rapp]

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

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.

Regards,
Tobias