Original h.264 to HEVC h.265 bigger file size!

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worldtoipad
Posts: 4
Joined: Thu Jan 26, 2017 12:40 pm

Original h.264 to HEVC h.265 bigger file size!

Post by worldtoipad » Wed Feb 08, 2017 5:41 am

I have the RF value set to 18 for h.265 encoding and this video file original 150 MB and my HEVC encoded is 181 MB.

This isn't making me any sense. I tried a lot of combos last night and all of them were resulting higher file size when it's suppose to be drastically smaller because HELLO it's HEVC.

Only way I got it down was RF value all the way to the left (51) and optimize video set to Ultrafast. Let's juts say i will be doing that again :D

My goal is to archive the video in high quality video format and small file size.

Video code is software H.265(x265)

rollin_eng
Veteran User
Posts: 1983
Joined: Wed May 04, 2011 11:06 pm

Re: Original h.264 to HEVC h.265 bigger file size!

Post by rollin_eng » Wed Feb 08, 2017 7:59 am

Could you please post your logs, instructions can be found here:

viewtopic.php?f=6&t=31236

mduell
Veteran User
Posts: 5322
Joined: Sat Apr 21, 2007 8:54 pm

Re: Original h.264 to HEVC h.265 bigger file size!

Post by mduell » Wed Feb 08, 2017 5:03 pm

worldtoipad wrote:
Wed Feb 08, 2017 5:41 am
suppose to be drastically smaller because HELLO it's HEVC.
That's now how this works. That's not how any of this works.

Butcher9_9
Posts: 1
Joined: Thu Feb 16, 2017 8:58 am

Re: Original h.264 to HEVC h.265 bigger file size!

Post by Butcher9_9 » Thu Feb 16, 2017 9:09 am

Don't take my word as gospel but I'm going to say that your source file may be too low res. I find that HEVC works better the higher the resolution (more space for the larger sampling areas ect) may just be that HEVC has more overhead or just cant be used to its fullest .

As an example I can get a 1080p video down to about 3-4GB (RF 20 - Slow) where as a similar 2160p video is about 6-8GB. Double the size and yet 4X more pixels. 720p on the other hand seems to have a lot more variance with some files being 500MB (same RF 20 - Slow) while others are 1.5GB+.

Just a guess based on my observations. Either that or some videos just don't benefit from the larger sample sizes ect (too random maybe) and yet still get slugged with a bigger overhead.

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