Frame extraction is fast — typically 20-30% of source duration on the standard pipeline. A 5-minute M4V → BMP bundle finishes in about a minute regardless of frame count, because the bottleneck is the BMP encoder, not the demuxer.
我可以在 M4V 视频中特定的时间戳提取框架吗?
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Yes — the advanced option accepts a comma-separated list of timestamps (e.g. `00:01:23,00:05:00,00:10:42`) and produces one BMP file per timestamp. Useful for chapter thumbnails, scene reference shots, or generating poster frames for HTML5 video.