Well, that episode is mostly a recap, but it would be very nice to get it for completeness sake.
I am of the philosophy of “every time a video is re-encoded it will lost data and quality, so do not retouch it more if possible”, but I will not attack you for that. Still, it would be nice if you could explain how you “deduced” the resolutions for both versions.
As for determining at what resolution something is produced at, you descale it to a resolution, then scale it back up, and check the relative error rate compared to the original image. Rinse and repeat for many resolutions until you find one with a very low error rate, which looks like this:
As for losing quality, that’s very true if you’re just tossing it through ffmpeg and getting whatever it spits out, but if you’re careful and know what you’re doing you can end up with something of roughly equal perceptual quality while dramatically shrinking the size. This release for instance is only 8% the size of the source files on the Blu-ray. And with filtering you can oftentimes improve the visual quality over what’s available on disc, which is especially common for anime. An example
Comments - 7
Moses35i
Thanks!
principeinquisidor
I have several questions:
LCE (uploader)
principeinquisidor
LCE (uploader)
As for determining at what resolution something is produced at, you descale it to a resolution, then scale it back up, and check the relative error rate compared to the original image. Rinse and repeat for many resolutions until you find one with a very low error rate, which looks like this:

As for losing quality, that’s very true if you’re just tossing it through ffmpeg and getting whatever it spits out, but if you’re careful and know what you’re doing you can end up with something of roughly equal perceptual quality while dramatically shrinking the size. This release for instance is only 8% the size of the source files on the Blu-ray. And with filtering you can oftentimes improve the visual quality over what’s available on disc, which is especially common for anime. An example
SomaHeir
GJ!!!
Xev
thank you