How can I take sequential screenshots from a video file using terminal?
With ffmpeg I could capture a single frame, but I need something like this

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OK, is your idea to mount a multiframed picture, using a looping = for(x; for(y; catch; put(x,y))) x lines y columns...? – Redbob Oct 04 '17 at 14:00
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1Related: https://unix.stackexchange.com/questions/63769/fast-tool-to-generate-thumbnail-video-galleries-for-command-line – Terrance Oct 04 '17 at 14:10
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@Terrance I think that's what OP's looking for. Could you please add an answer with the *Unix & Linux* link as a reference? – pomsky Oct 04 '17 at 16:07
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It's a GUI solution, but a very simple one. You may use SMPlayer for this purpose.
- Open a video with SMPlayer and select Menu > Video > Thumbnail Generator.

- You should get a few options to play with.

- Select OK and you'll get the final output.

Since SMPlayer is a front-end for mplayer, I believe same can be achieved using Terminal with the proper usage of mplayer command.
pomsky
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