Trimming
Trimming (Video Clip Extraction)
The operation of selecting a specific time range from a video and extracting or keeping only that segment, discarding the content before the start point and after the end point.
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Lossless trimming (stream copy) cuts at keyframe boundaries without re-encoding, preserving original quality but limiting precision to the nearest keyframe (typically 2-10 second intervals). Frame-accurate trimming requires re-encoding the segments between cut points and the nearest keyframes. FFmpeg performs lossless trim with: ffmpeg -ss START -to END -i input.mp4 -c copy output.mp4. Placing -ss before -i enables fast seeking using the container index. Browser-based trimming with MediaRecorder captures portions of video playback, while FFmpeg.wasm enables true frame-level cutting client-side. The most common pitfall is audio-video sync drift when cutting at non-keyframe positions without re-encoding.
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```html <!-- Trimming: HTML5 video with format fallback --> <video controls preload="metadata"> <source src="video.webm" type="video/webm; codecs=vp9,opus"> <source src="video.mp4" type="video/mp4"> Your browser does not support HTML5 video. </video> ```