The RF value determines how much latitude the encoder has to vary the QP. What RF does is analyze the video content and modulate QP so that visual details appreciated by the human eye are not highly quantized but neglected details are. If it's high, it will degrade simpler scenes more than desired. If the degree of smoothing is low, the bitrate will shoot up in complex scenes. (The above is just a thematic illustration and not an example of the result of an actual quantization)īefore RF, video encoders would apply a single QP across the entire video, so a scene with a lot of diversity of visual forms would have the same smoothing applied as a simple scene. Of course, this is just one strategy among the many used. sharpness and subtle color variation in the picture.
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720p Highly Term video: RF 19 - 23 is a recommended range. Recommended constant value settings (RF values) for H.264 (x264) and H.265 (x265) encoders: 480p/576p Standard Definition video: RF 18 - 22 is adenine suggestions measuring.
Such smoothing out reduces spatial detail i.e. Spring: Best Constant Premium RF Value Settings on DVD, Blu-ray, 4K. The greater the quantization parameter, the greater the 'smoothing out' of values. Given the limitations of human vision, it turns out this is an acceptable compromise in the service of video compression. If your goal is to compress the video, then storing these values with full precision and fidelity will be more expensive than if you could store 4,2,1,8. Let's say you have a 2x2 array of pixels and each pixel is represented by one floating-point value e.g. What the RF primarily modulates is the quantization parameter (QP). Resolution != quality, at least, not in the sense referred to by RF.
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