![]() ![]() Imperfections tend to be more noticeable at larger display sizes and closer viewing distances. You should not expect an x264 encode at RF 25 to be similar to an x265 encode at RF 25 or an SVT-AV1 encode at RF 25, as each encoder’s quality scale corresponds only to its own internal rate control method, and these are three separate encoders corresponding to three different video coding standards. In all cases, adjusting HandBrake’s quality control to the right always increases quality, and adjusting the control to the left always decreases quality.Įven where the quality scale is similarly labeled, quality values are not comparable between encodes across multiple encoders. This is reversed for other encoders, such as Apple VideoToolbox, where a higher number produces higher quality. For these encoders, a lower RF number produces higher quality video, and a higher RF number produces lower quality video. Most of HandBrake’s official Presets use the x264, x265, or SVT-AV1 video encoders with a Constant Rate Factor, sometimes abbreviated CRF or simply RF. Differences between encoder quality scales When in doubt, stick to the recommended range or use the default setting for the Preset you selected. Using higher than recommended quality settings can lead to extremely large files that may not be compatible with your devices. Drastically lower settings may show significant loss of detail. Lower quality settings may be used to produce smaller files. Raising quality by a few steps may produce better results when encoding animated Sources (anime, cartoons). Therefore, you can get away with using lower quality values than you can with lower resolution content, as any loss is a smaller percent of the whole, and ultimately less perceptible. When encoding higher resolution content, you have more information to work with. These values may seem counterintuitive at first, but the reasoning is simple and easy to demonstrate in practice.
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