- May 26, 2019
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Another hint: In my own testing any alpha_q value of 80 or above doesn't result in any major impact to image quality. Lower values start giving banding artifacts like a PNG in 256 color mode.I am using cwebp already, with -m 6, -af and -sns, and I want to experiment with -pre and -hint to see if it'll do even better. I didn't bother with -alpha_q cause 99% of my images are opaque, but I guess it won't hurt.
Yeah, VP9 is hard on the CPU. That's why I limited resolution to 540p(1/4 res) on mobile. Modern phones have Hardware VP9 decoding but I disable HW playback on my builds for compatibility, I don't know if you do the same(config.hw_video = False). My ZTE Axon 7(circa 2016) wasn't able to handle 1080p but could play 540p just fine. I couldn't tell a difference in quality on a screen so small.I've had horrible time with VP9 on just slightly older Android devicesLike, mostly smooth playback with VP8, and one frame per 2 or 3 seconds on VP9. I don't know, I'll see what I can do.
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