[FFmpeg-user] OpenEXR input with cropped data window produces black output

[Kevin Wheatley]

Answering my own question... I have not tested this but having
manually read the code in the git history I'll try code up a fix for
my theory:

looks like there is a bug in the commit
1a08758e7c4e14a9ea8d2fef6c33ad411b2d3c40 relating to the handling of
ptr in decode_frame after decode_block is called, before this commit
ptr would have been incremented for each line in the data window, now
after the commit  it is left at the start of the first included line
rather than the line after the data window then the code sets the
remaining lines to 0 and thus the whole image is over written.

Kevin