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: While great for playback, MP4 files with many B-frames can be harder to edit. Some software may crash or ignore the first few frames if the "B-frame" sequence is not handled correctly.
: B-frames use both previous and future frames as references to calculate data. This allows for significantly higher compression ratios than P-frames (predictive) or I-frames (intra-coded) alone.
: For long-form content, using B-frames often results in files that are up to 50% smaller than those using only I and P frames without a noticeable loss in quality.
: Because a player must wait for a "future" frame to decode the current B-frame, highly compressed MP4s can sometimes show a slight delay or "stutter" during seeking.