[FFmpeg-devel] [PATCH] avcodec/dpxenc: support colour metadata in DPX encoder, fixes ticket #6023

Carl Eugen Hoyos ceffmpeg at gmail.com
Thu Feb 2 10:19:48 EET 2017

2017-02-01 23:37 GMT+01:00 Kieran O Leary <kieran.o.leary at gmail.com>:

> DPX contains some values that are super-specific to film, such as 'Printing
> Density'. I do not see that value in either of those enums but it's a
> common value that pops up in film scans.

Then I believe you have to add this property to the enums.

> The larger issue that I see with this approach is that it's an integer that
> needs to be written to the 801/802 offsets in the DPX header. So if I want
> logarithmic transfer characteristic, 3 needs to be written as the value and
> this is interpreted by the decoder. Logarithmic is listed as 9 in
>  AVColorTransferCharacteristic

This means you need a translation in dpxenc.c.

Carl Eugen

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