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It’s been a long time since I took a class on compression, but I wonder if 4K has worse image quality than 1080P at the same bitrate. Anyone know?
by rhino369 8y ago
It’s been a long time since I took a class on compression, but I wonder if 4K has worse image quality than 1080P at the same bitrate. Anyone know?
- tincholio 8y agoIt will depend on a bunch of things (codec used, encoding parameters, size of the screen, etc.), but most likely yes.
- ska 8y agoAll else being equal, yes. The devil is very much in the details though.
- Dylan16807 8y agoIt depends on how restrictive the bitrate was to begin with. Higher bitrates mean there's more data to move from mini-improvements over to filling in extra resolution. Lower bitrates mean you're already squeezing every drop out and the codec will collapse when asked to handle more pixels. Here's a couple charts: https://cdn.shopify.com/s/files/1/0095/4332/files/optimal_bitrate_4_grande.jpg https://cdn.shopify.com/s/files/1/0095/4332/files/optimal_bi... https://di2vvsisz3gt1.cloudfront.net/wp-content/uploads/2018/12/08193649/fb8f7-1MM2gim3HrryC-djD3mYGBw.png https://di2vvsisz3gt1.cloudfront.net/wp-content/uploads/2018... It's possible to design a codec to handle that kind of detail scaling internally, but I don't think it's been a big priority.