Depends on resolution and JPG codec. A 1080p PNG frame is typically 2 to 5 MB; a 1080p JPG at quality-85 is 200 to 500 KB; a 4K PNG is 6 to 15 MB. At the extreme, every-frame PNG extraction of a 10-minute 1080p MP4 produces ~50 GB total.
Frame extraction is fast — typically 20 to 30% of source duration on the standard pipeline. A 5-minute MP4 → JPG bundle finishes in about a minute regardless of frame count, because the bottleneck is the JPG encoder, not the MP4 demuxer.
我可以在 MP4 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 JPG file per timestamp. Useful for chapter thumbnails, scene reference shots, or thumbnailing long lectures.