Guard Bits In CINEMA2K Profile

[anderson1077]

All CINEMA profiles result in 2 guard bits. SMPTE RDD-52 now specifies 1 guard bit for CINEMA2K and 2 guard bits for CINEMA4K. This appears to be a hard-coded parameter, and would be great to either change it to match the recommendation or make it a user definable parameter.

Also note that RDD-52 also specifies a cblk of 32,32, whereas the default is 64,64. There is already an option to override this.

[MarcAntoine-Arnaud]

By doing same as here, it's possible to set the guard bits to 1.

I have submitted a patch on FFmpeg to be able to set this parameter in libopenjpeg encoder.

[rouault]

@anderson1077 / @MarcAntoine-Arnaud could you check if #1559 fixes the issue?

[MarcAntoine-Arnaud]

It's sounds perfect !
I will keep my patch on ffmpeg for now as I not sure to be able to use latest openjpeg version.