Hi all,

While working on a composite transition issue in Kdenlive, I just noticed a 9 
months old regression...

Composite transitions with luma files are currently broken, resulting in 
corrupted images and leading to crashes when using an alpha operator on the 
transition.

Issue can be reproduced with the following command line:

melt clip1.mp4 -track clip2.mp4 -transition composite 
geometry="0=0/0:100%x100%:0;200=0/0:100%x100%:100" luma="/usr/local/share/mlt/
lumas/PAL/luma05.pgm"

(adjust path to your MLT's luma file)

colors are corrupted. Adding " operator=and " crashes.

The regression was introduced by this commit:

Use mlt_frame_get_alpha() instead of mlt_frame_get_alpha_mask(). 

https://github.com/mltframework/mlt/commit/
8452d9f904ed281ddec892df7dcca63961ff903e

Anybody has an idea on a fix ?

Thanks & regards
jb

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