Last time I checked they do it for new videos only. Older videos with 1M views aren't even on AV1.
back
1 comments
Makes sense, new videos are where most of the streams are happening, I wouldn't be surprised if they start to reduce the number of transcodes to save space as a video drops in popularity. h264 will work on everything so they need that as a minimum, with AV1 just being there to save on data transfer.