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I have seen this and this post explaining how to crop and stack videos using ffmpeg.

My question is - is there an easy (preferably one step) way to turn a horizontally stacked video into a vertically stacked one?

And is there a Linux-way to re-encode given 3D video formats into others?

Edit:

with Mulvyas help I wrote a script which does the converting stuff and creates a text file with meta information needed by the Gear VR video player.

Note: you need a recent version of ffmpeg for the vstack filter - version 2.6 which is installed with Fedora 22 is too old. Version 2.8.3 has vstack available.

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3

Just integrate all filtering into one command:

ffmpeg -i input.mp4 \
-filter_complex "[0:v]crop=in_w/2:in_h:0:0 [top]; \ 
[0:v]crop=in_w/2:in_h:in_w/2:0[bottom]; \
[top][bottom]vstack[outv]" \
-map "[outv]" -map 0:a -c:a copy output_3dv.mp4

Edit: this command below scales and pads the output to 2000x2000

ffmpeg -i input.mp4 \
-filter_complex "[0:v]crop=in_w/2:in_h:0:0 [top]; \
[0:v]crop=in_w/2:in_h:in_w/2:0[bottom]; \
[top][bottom]vstack,\
scale=iw*min(2000/iw\,2000/ih):ih*min(2000/iw\,2000/ih), \
pad=2000:2000:(ow-iw)/2:(oh-ih)/2[outv]" \
-map "[outv]" -map 0:a -c:a copy output_3dv.mp4
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6
  • I have a source video named input.mp4 which I first turn into left.mp4 and right.mp4. If I understand your command assumes these files to exist in the first place.
    – frans
    Commented Dec 12, 2015 at 14:59
  • modified for single input
    – Gyan
    Commented Dec 12, 2015 at 15:08
  • can you scale and pad the output at the same time, too?
    – frans
    Commented Dec 12, 2015 at 16:47
  • sure. what do you want done?
    – Gyan
    Commented Dec 12, 2015 at 17:00
  • I'd want to pad the output to be squared (same width as height). Currently I'm running -vf "pad=width=in_h:height=in_h:x=in_w/2:y=0:color=black" on the output. And additionally I'd like to have a fixed width (and height) of e.g. 2000 pixel
    – frans
    Commented Dec 12, 2015 at 17:07

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