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This is the VP8 Alpha Encoder which can produce VP8 videos with alpha channel
from raw AYUV videos.
To convert an avi/vp6a video with alpha into raw ayuv video, use:
ffmpeg -i <input_file> -f rawvideo -c:v rawvideo -an -pix_fmt yuva420p raw.out
Make sure to note the width and height in the output.
Then, you can encode the raw file with VP8 along with the alpha using:
./alpha_encoder -w <width> -h <height> -i raw.out -o vp8alpha.webm
Various supported options can be found by running:
./alpha_encoder -?
The design doc of how this works can be found here: