#10987: Blend video filter *_expr options don't handle store and load functions
correctly.
-------------------------------------+-------------------------------------
Reporter: Fallan | Owner: (none)
Type: enhancement | Status: new
Priority: normal | Component: avutil
Version: git-master | Resolution:
Keywords: "blend | Blocked By:
filter" "store and load" st() |
ld() |
Blocking: | Reproduced by developer: 0
Analyzed by developer: 0 |
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Comment (by Michael Koch):
Simplified examples for reproducing:
This does not work:
ffmpeg -f lavfi -i color=red -f lavfi -i color=yellow -lavfi
blend=all_expr='st(0,Y/H);A*ld(0)+B*(1-ld(0))' -frames 1 -y out1.png
This does work:
ffmpeg -f lavfi -i color=red -f lavfi -i color=yellow -lavfi
blend=all_expr='A*Y/H+B*(1-Y/H)' -frames 1 -y out2.png
It seems the memory for variable 0 is overwritten by something else in
most cases (but not always).
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Ticket URL: <https://trac.ffmpeg.org/ticket/10987#comment:2>
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