Confused by Video RF value

[KSGregg]

Description of problem or question:

I've burned maybe 1000 movies using an RF value of 18-20 but read that increasing the RF value will provide a better quality version of the burned DVD. One movie at RF 18-20 is a file size of 1,145,575 KB but when I burned the movie again at an RF of 23, the file size is 883,653 KB. I would think the higher RF value would make for a larger file, not a smaller one, or am I just not understanding it properly? I am burning these DVDs to put on my Plex server for streaming in home so I'd like the best quality I can obtain.


Steps to reproduce the problem (If Applicable):




HandBrake version (e.g., 1.0.0):

1.5.1


Operating system and version (e.g., Ubuntu 16.04 LTS, macOS 10.13 High Sierra, Windows 10 Creators Update):

Windows 10


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[Silent_Strider]

Best quality would be to not transcode any source video.

I think, if you increase the RF, then some details can go missing, which can be helpful at grainy sources, if the image becomes more "clear" and thus would be better compressible.

[mduell]

Description of problem or question:

I've burned maybe 1000 movies using an RF value of 18-20 but read that increasing the RF value will provide a better quality version of the burned DVD. One movie at RF 18-20 is a file size of 1,145,575 KB but when I burned the movie again at an RF of 23, the file size is 883,653 KB. I would think the higher RF value would make for a larger file, not a smaller one, or am I just not understanding it properly? I am burning these DVDs to put on my Plex server for streaming in home so I'd like the best quality I can obtain.

As covered in the documentation, higher RF is lower quality.

[KSGregg]

This is why I am confused. The QUALITY setting on the VIDEO tab shows that if you slide it to the left, it is LOWER QUALITY with a lower RF but if you slide it to the right towards HIGHER QUALITY it is a higher RF. If you hover the mouse over the RF it says "SUGGESTED VALUES FOR 18-20 FOR STANDARD DEFINTION SOURCES AND 20-23 FOR HIGH DEFINITION SOURCES"

[Silent_Strider]

the tooltip definitely states "lower values correspond to higher quality"
https://i.imgur.com/fGf72WU.jpg

[KSGregg]

And I am certainly not trying to debate you BUT that same screen grab also says 18-20 for standard definition and 20-23 for higher definition so you can see where I might be seeing conflicting info?

[s55]

High Definition source files have more information so you don't need as high a quality setting to achieve good results.

[KSGregg]

I have a lot of movies with special effects that I feel could be better. My QNAP NAS stores all of the movies and I stream them to my TVS. Can you recommend the best video settings then? In your opinion, which is the better quality burn? The movie I did at RF20 (1,145,575 kb) or the same movie at RF 23 (883,653 kb)? My plan WAS to re-burn my movies at what I thought was a higher quality (RF 23) but now I am unsure.

[mduell]

And I am certainly not trying to debate you BUT that same screen grab also says 18-20 for standard definition and 20-23 for higher definition so you can see where I might be seeing conflicting info?

This is also explained in the documentation.