A question regarding MeGUI...

[HauntingShock]

How do I say it...

Ok, I have a 720p 100MB video with decent quality. Let's say I wanted to downscale it to 480p... how do I prevent quality loss?
I mean, I'm using Constant Quality as the encoding mode and tried encoding with 0 crf. I was expecting it to give me any sizes but 100mb+ , it gave me 2GB+ o_o

The lower the crf value, the closer it is to the original video quality right? The original video was 100MB, where did those extra GB came from?

And is there anyway to keep quality closest to the original video with the given scenario above?


Edit: Oh wait, let me try that lossless encoder settings.

[sneaker_ger]

The encoder doesn't take the compressed data of the file and compresses it further but instead the following chain is executed:
(compressed input file) -> decoder -> (uncompressed video data) -> encoder

"--crf 0" means lossless encoding (in 8 bit) and the file size will be huge. It will not be lower than the compressed input file, but only lower than the uncompressed video data it received from the decoder.

[HauntingShock]

Oh... never knew it takes the decompressed one... thanks :D

Any answers regarding the second question?

[sneaker_ger]

Strictly speaking, you can only lose quality in your situation, but it may still be indistinguishable from the original for your eyes. (We call that "transparent")
You have to experience with different crf settings or bitrates and presets to find a sweet spot. There are no special re-encoding settings, just the usual recommendations. (pick level, preset, tuning and then bitrate or crf)

[HauntingShock]

I see... too bad.

Well, thanks for answering :)