The name is technically misleading, as x264 does not actually use pyramid coding it simply adds B-references to the normal reference list.

Recommended default: 0Īllows B-frames to be kept as references.

Make x264 more likely to choose higher numbers of B-frames during the adaptive lookahead. It is possible to disable this adaptivity this is not recommended. X264, by default, adaptively decides through a low-resolution lookahead the best number of B-frames to use. It also may slow down the first pass of x264 when in threaded mode. Its speed gets considerably slower at high bframes values, so its recommended to keep bframes relatively low (perhaps around 3) when using this option. A good balance between speed and quality.Ģ: A much slower but more accurate B-frame decision mode that correctly detects fades and generally gives considerably better quality. Does not work with pre-scenecut (scenecut must be off to force off b-adapt).ġ: Fast, default mode in x264. – If you want to generate H.264 baseline for older iPhone 3 phones, then do not use Advanced Parameters like B-frames or else the output will be generated as Main profile.Ġ: Very fast, but not recommended. – Baseline Profile, such as that used by iPods, does not support B-frames. This parameter simply serves to limit the max number of B-frames. Most, however, do not as a result, there is rarely any negative effect to setting this to the maximum (16) since x264 will, if B-adapt is used, automatically choose the best number of B-frames anyways. Some specific targets, such as HD-DVD and Blu-Ray, have limitations on the number of consecutive B-frames. Recommended default: 40ī-frames are a core element of H.264 and are more efficient in H.264 than any previous standard. Recommended default: 25Īdjusts the sensitivity of x264's scenecut detection. Minimum GOP length, the minimum distance between I-frames. Very high GOP lengths will result in slightly more efficient compression, but will make seeking in the video somewhat more difficult. This determines the maximum distance between I-frames. Keyframe interval, also known as GOP length. FFmpeg developer superdump has implemented x264 presets to FFmpeg. This guide maps most of x264's options to FFmpeg's options along with detailed descriptions by libx264 developer Dark_Shikari.

Ffmpeg crf cqp same