[FFmpeg-devel] [PATCH] avcodec/dpx: Support for RGB and RGBA 12-bit packed decoding

[Carl Eugen Hoyos]

2018-02-12 20:47 GMT+01:00 Jerome Martinez <jerome at mediaarea.net>:

> https://mediaarea.net/temp/uncropped_DPX_4K_16bit_Overscan15pros.dpx
> is indicated by the person who provided it as with DPX alpha channel used
> for actually storing infrared

Thank you!

This sample appears to confirm that GraphicsMagick is right and FFmpeg
is buggy. To avoid creating more incorrect (ffv1) encodes, I (strongly)
suggest to first fix this issue and commit your patch to support more
bit-depths but if you disagree, please feel free to commit!

There is also this sample though:
http://samples.ffmpeg.org/ffmpeg-bugs/trac/ticket2392/

The only solution I can think of is to change the semantics of the fourth
dpx layer by default and to add an option (to the decoder) that allows using
the current semantics that defaults to "auto" reading the encoder value.

Carl Eugen