ffmpeg/libav version from git-1eabd71 windows build dated: 3/25/2012
I am trying to merge two transparent images onto one another using the
avfilter overlay:
ffmpeg -i a.png -vf movie=a.png, transpose=1 [inA]; [in] [inA] overlay [out]
a.png has alpha in the image.
When I run, the main image is always converted to yuv420p (no alpha)
while the overlay image remains a yuva420p image. I have tried to
insert the format filter in front, back, etc to the source image, but
the filter graph still inserts an extra scale filter to force the main
image to be a yuv420p (no alpha) image.
The resulting image always has the background as my image without alpha
and the overlay image has alpha.
Is there a way to get the main overlay image to remain an alpha image?
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