Hello.I too think the code submitted by Ryo overwrites pixels, and does some amount of extra work, but the latter may be because I just don't seem to understand the way draw_slice is meant to work. Indeed, I have written myself a version of the pad filter (also derived from mplayer, though I called it vf_pad.c), but kept it there for weeks waiting for the time to understand draw_slice better. So, I hope it is OK to attach it here to get some feedback from Vitor and the others?
I'd be interested to know whether my draw_slice is correct: in particular what exactly the parameters y and h refer to and therefore what assumptions can I make on them?, and is the final call to avfilter_draw_slice(...) in my draw_slice correct?
Thanks, vmrsss
vf_pad.c
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