import av container = av.open("cross.s01e01.webm") video_stream = container.streams.video[0]
It sounds like you're looking for a video encoding or playback component related to using the libvpx codec (VP8/VP9). cross s01e01 libvpx
However, your request is a bit ambiguous. Here are the three most likely interpretations, along with a ready-to-use solution for each: to encode that episode into WebM using libvpx If you have the source file (e.g., cross.s01e01.mkv ) and want to convert it to VP9/WebM: import av container = av