Use time sampling to make a quick contact sheet
Extracting one frame every second gives you a manageable overview of a short recording. Select the file, choose the start and end time, keep the one-second interval and capture the sequence. The gallery helps you identify where a scene changes or a subject appears. For one overview image, use the contact-sheet tool below; choose the ZIP when you need separate pictures for another application.
Understand the interval and end boundary
Sampling starts at the selected start time and excludes the selected end. A range from 2 to 7 seconds with a one-second interval requests five images at 2, 3, 4, 5 and 6 seconds. An interval changes the requested times; it does not change the video’s source frame rate. Browser seeking can deliver a nearby decoded frame, particularly with unusual timing. Use an exact-frame decoder when that distinction matters for your task.
Choose a sequence that fits the gallery
The workspace allows up to 120 captured images and 96 MB in one gallery. One-second sampling across more than two minutes can exceed the image-count limit, and 4K PNG files may reach the byte budget sooner. Select a shorter range, increase the interval or use JPG/WebP for smaller files. Download and clear a completed gallery before starting another batch. Cancel stops the remaining requests and keeps images already captured for inspection.
Questions for this workflow
Can I extract two frames per second?
Yes. Choose the 0.5-second interval. That is timestamp sampling, not source-frame indexing.
Does the end frame appear in the batch?
No. The end time is excluded. Capture it separately if it is a valid time you need.
Continue your workflow
Read practical guides · Enlarge an image · Report a reproducible problem
Capture uses the shared frame-extractor limits: 2 GiB source, 8,294,400 decoded pixels, 120 pictures and 96 MiB retained images. Start with a short playable sample; codec support and device memory vary.