Stack input videos vertically.

This is the VA-API variant of the vstack filter, each input stream may have different width, this filter will scale down/up each input stream while keeping the orignal aspect.

It accepts the following options:

inputs

See vstack.

shortest

See vstack.

width

Set width of output. If set to 0, this filter will set width of output to width of the first input stream. Default value is 0.