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Is it possible to input a video and extract images every second while simultaneously stack them horizontally or vertically with the "hstack" filter to create one jpg image?

The only way I can figure out how to do it is by extractning the still-frames with this command:

ffmpeg -i INPUT.mov -vf fps=1 -s 192x108 thumbnails%03d.jpg

And then inputting them one by one and then specifying then number of inputs like this.

ffmpeg -y -i thumbnails001.jpg -i thumbnails002.jpg -i thumbnails003.jpg... filter_complex vstack=inputs=3 output.jpg

It would be nice if it was possible to do in one more dynamic chunk from the original video or at least from one inputted Video-Sequence and not manually inserting the number of INPUTS needed to create the Stack.

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You're better off using the tile filter for this:

ffmpeg -i INPUT.mov -vf fps=1,scale=192:108,tile=54x1 output.jpg

The tile argument is the size of a rectangle. So for a 54 second video, 54x1 produces a horizontal stack of 54 frames. Use 1x54 for a vertical stack.

  • Thanks a lot. Works like a charm. Is it possible to specify what frame number each second it should choose? Now for a 25fps clip it seems to choose frame 13. I would like it to choose the first frame each second. – Thomas Nov 15 '16 at 12:34
  • Replace fps=1 with select='not(mod(n,25))' – Gyan Nov 15 '16 at 13:07
  • Once again, many thanks! I needed to add it whithin "" in this filter chain. Now it works. -vf "select='not(mod(n,25))'",scale=960:540,colormatrix=bt709:bt601,tile=30x1 – Thomas Nov 15 '16 at 14:13

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