x265 has two secret weapons for shrinking:
Pro preset for shrinking: --no-sao (turns off Sample Adaptive Offset). SAO smooths images but wastes bits. Disabling it can save 5–10% file size at the cost of slight ringing artifacts.
The single biggest mistake people make when trying to shrink x265 is feeding it noisy source material. shrinking x265
Film grain and digital noise are the enemies of compression. x265 sees noise as "important detail" and wastes gigabytes trying to preserve random dots.
If you want to shrink x265 to absurdly small sizes, you must denoise the video before encoding. x265 has two secret weapons for shrinking:
If you use HandBrake, StaxRip, or the command line, the difference between a bloated file and a perfectly shrunk file is in the encoder tuning.
Here is the specific syntax to force x265 to shrink aggressively while saving quality. Pro preset for shrinking: --no-sao (turns off Sample
The most common interpretation of "shrinking x265" is making the encoding process faster—reducing the time required to compress video.
To be fair, aggressive x265 encoding has legitimate uses:
The problem is when one-size-fits-all shrinking is applied to film grain–heavy movies, fast action, or HDR content. That’s where the magic trick fails.
After shrinking x265, test on these three nightmare scenes: