I have a collection of RGBA png files, and have verified the presence of an alpha layer on each file:
gst-launch-1.0 multifilesrc location="pics/%d.png" ! decodebin ! videorate ! videoconvert ! video/x-raw,format=BGRA,framerate=60/1 ! videomixer background=checker ! videoconvert ! ximagesink
I want to take these files and make them into a video file (in any format that GStreamer will readily handle with a simple decodebin). What would be a good set of encoders, containers, and elements to use for this?
I've tried avimux but no alpha data was saved. I also tried avenc_huffyuv, and that would decode fine as raw data using avenc_huffyuv, but decodebin could not detect it.
Nothing like a good night's sleep to solve an issue..
Apparently the huffyuv encoder and avi muxer work nicely together to preserve tranpsarency:
gst-launch-1.0 multifilesrc location="pics/%d.png" ! decodebin ! videorate ! videoconvert ! video/x-raw,format=BGRA,framerate=60/1 ! avenc_huffyuv ! avimux ! filesink location=/tmp/test.avi