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. This guide maps most of libx264's options to FFmpeg's options along with detailed descriptions by x264 developer Dark_Shikari.įFmpeg developer superdump has implemented x264 presets to FFmpeg.
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