[Bug 766236] rtp j2k payload/depayload messes up colours in sample pattern

[GStreamer (GNOME Bugzilla)]

https://bugzilla.gnome.org/show_bug.cgi?id=766236

--- Comment #15 from boxerab at gmail.com <boxerab at gmail.com> ---
The stream contains the following information in the main header:

1) subsampling specification
2) whether J2K multi component transform (MCT) was performed or not

MCT is the J2K transform from RGB to YUV.  So, if MCT == 0, then we
can assume (I think) that the space is YUV.  

Combining these two fields, we can deduce the colour space.

But, I would need to set the video caps after I start reading the stream.
How would I do that?

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