Generate a 'tile' thumbnail picture every 30 frames of a video

The following command will take any input video, in our case bunny.webm, snap a frame every 30 frames (using the filter select='not(mod(n\,30))'), scale it to 160x120 (using the filter scale=160:120) and organize each frame in a tile using the tile filter.

The tile filter can be used to generate a ‘storyboard’ image for video player (e.g. on youtube).

The tile filter supports different layouts (i.e. COLUMNSxROWS), padding, margin, background color and more. For full info, see the FFmpeg tile filter documentation.