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  1. Member
    Join Date
    Aug 2018
    Location
    Wrocław
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    First try to encode to x265 with the latest ffmpeg and it comes out that the "slower" preset generates a larger file than the default...

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  2. Member
    Join Date
    Aug 2013
    Location
    Central Germany
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    A slower preset spends more time searching for similarities in the video. That doesn't guarantee it can actually find a way to encode the video content with less data. Some slower presets enable the use of algorithms which may save some space in the average case but may as well need more space than more simple algorithms in the worst case for them.
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  3. Member
    Join Date
    Mar 2008
    Location
    United States
    Search Comp PM
    The larger size on the slower presets has been mentioned a few times
    in this forum, this seems to be the way it works in X265
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  4. Like x264, x265 enables settings that give better image quality (and require more bitrate) as you go to slower settings. So moving to slower presets doesn't necessarily mean you will get more compression.
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