user17200: 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. 

user1871: 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.

17200: <p>Is it possible to input a video and extract images every second while simultaneously stack them horizontally or vertically with the <strong>"hstack"</strong> filter to create one jpg image?</p>

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

<pre><code>ffmpeg -i INPUT.mov -vf fps=1 -s 192x108 thumbnails%03d.jpg
</code></pre>

<p>And then inputting them one by one and then specifying then number of inputs like this.</p>

<pre><code>ffmpeg -y -i thumbnails001.jpg -i thumbnails002.jpg -i thumbnails003.jpg... filter_complex vstack=inputs=3 output.jpg
</code></pre>

<p>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. </p>
 1871: <p>You're better off using the <code>tile</code> filter for this:</p>

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

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