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Sometimes higher resolution can even reduce the bitrate, since jagged edges become smooth transitions. Basically, the codec has the freedom to reduce the resolu

Sometimes higher resolution can even reduce the bitrate, since jagged edges become smooth transitions. Basically, the codec has the freedom to reduce the resolution if that's what will maintain the most quality. I only know about this practically in regards to 10-bit anime being more compressible than 8-bit, but I assume the same logic applies.

CarVac 8y ago
I don't think so. 10-bit improves compression because posterization leads to noisy patterns that must be encoded. By smoothing the posterization out, encoding a gradient, and having the decoder produce the noise, you can save bitrate. But the equivalent in spatial resolution is encoding near-horizontal lines... which isn't a common situation (unlike gentle color gradients) and isn't a problem in the first place.
- l33tbro 8y ago
  How does posterization differentiate from banding? I know when I encode videos from an 8-bit color space, I sometimes have to generate an additional layer of noise so that I don't end up with those horrible macro-blocking blotches you get with banding.
  - CarVac 8y ago
    Posterization is the technical term for this sort of banding. Banding can refer to all sorts of things that form bands, like fixed pattern noise from a camera sensor.
Wowfunhappy 8y ago
> Sometimes higher resolution can even reduce the bitrate I cannot imagine how this could ever be true. Have you experienced it actually happening for the same content at the same encoding settings? "bitrate" = file size / duration. There is no reason why increasing the resolution should ever make a video more compressible. This is completely different from the 10-bit situation you described, which takes place because you're storing data in a different format. You could choose to encode a higher resolution copy of a video at a lower bitrate, but it's nothing an encoder will do by default, and it should always result in the higher resolution version looking worse.

CarVac 8y ago

I don't think so. 10-bit improves compression because posterization leads to noisy patterns that must be encoded. By smoothing the posterization out, encoding a gradient, and having the decoder produce the noise, you can save bitrate. But the equivalent in spatial resolution is encoding near-horizontal lines... which isn't a common situation (unlike gentle color gradients) and isn't a problem in the first place.

l33tbro 8y ago
How does posterization differentiate from banding? I know when I encode videos from an 8-bit color space, I sometimes have to generate an additional layer of noise so that I don't end up with those horrible macro-blocking blotches you get with banding.
- CarVac 8y ago
  Posterization is the technical term for this sort of banding. Banding can refer to all sorts of things that form bands, like fixed pattern noise from a camera sensor.

Wowfunhappy 8y ago

> Sometimes higher resolution can even reduce the bitrate I cannot imagine how this could ever be true. Have you experienced it actually happening for the same content at the same encoding settings? "bitrate" = file size / duration. There is no reason why increasing the resolution should ever make a video more compressible. This is completely different from the 10-bit situation you described, which takes place because you're storing data in a different format. You could choose to encode a higher resolution copy of a video at a lower bitrate, but it's nothing an encoder will do by default, and it should always result in the higher resolution version looking worse.