> Am 01.02.2021 um 00:08 schrieb Craig Turner <[email protected]>:
> 
> You are absolutely right - the format is AV_PIX_FMT_YUV420P, so it seems the 
> alpha channel is not being decoded. Is there something specific I need to do 
> to ensure it does indeed get decoded?

It may be necessary to configure with --disable-decoder=vp8

Carl Eugen 
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