At what resolution does the extracted BMP image come out?
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Same pixel dimensions as the source M4V — a 1080p video produces 1920x1080 BMP frames, a 4K source produces 3840x2160 BMP frames. Resize after extraction if you need smaller thumbnails (we have a /image-resize/ tool for that).
Can I extract every frame from a M4V file as BMP?
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Yes, but be careful with the file count — a 30fps 1-minute video produces 1,800 frames. We pack them into a ZIP automatically. For longer clips the "1 per second" option (60 frames) or named timestamps are usually more useful than every-frame.
Will the BMP images preserve M4V HDR color?
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HDR sources are tone-mapped to SDR when extracting to BMP (PNG / JPG can't store HDR pixel ranges natively). WebP / AVIF / TIFF BMP can preserve a wider gamut if the BMP encoder supports 10-bit, exposed in advanced options.
What is the file size of one extracted BMP frame?
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Depends on resolution and codec. A 1080p PNG frame is 2-5 MB; a 1080p WebP frame at quality 80 is 80-200 KB; a JPG quality-85 frame is 200-500 KB. Multiply by frame count to size the ZIP — every-frame PNG of a 10-minute 1080p video is around 50 GB.
Does the extracted BMP keep camera EXIF metadata?
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The M4V container does not store per-frame EXIF the way a still camera does, so the BMP files come out with empty EXIF. We embed a `creation_time` field pointing at the source frame timestamp so you can re-sort the bundle chronologically.
How long does frame extraction from M4V to BMP take?
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Frame extraction is fast — typically 20-30% of source duration on the standard pipeline. A 5-minute M4V -> BMP bundle finishes in about 1 minute regardless of frame count, because the bottleneck is the BMP encoder not the demuxer.
Can I extract frames at specific timestamps in the M4V?
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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 or hero scene reference shots.
Is my M4V video private during BMP extraction?
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Yes — same privacy model as every conversion. Source video and extracted frames are processed in isolated workers and deleted within minutes of completion.