xstack - FFmpeg 4.1.11 / Filters / Video

Stack video inputs into custom layout.

All streams must be of same pixel format.

The filter accept the following option:

inputs: Set number of input streams. Default is 2.
layout: Specify layout of inputs. This option requires the desired layout configuration to be explicitly set by the user. This sets position of each video input in output. Each input is separated by ’|’. The first number represents the column, and the second number represents the row. Numbers start at 0 and are separated by ’_’. Optionally one can use wX and hX, where X is video input from which to take width or height. Multiple values can be used when separated by ’+’. In such case values are summed together.
shortest: If set to 1, force the output to terminate when the shortest input terminates. Default value is 0.

Examples

Display 4 inputs into 2x2 grid, note that if inputs are of different sizes unused gaps might appear, as not all of output video is used.
```
xstack=inputs=4:layout=0_0|0_h0|w0_0|w0_h0
```
Display 4 inputs into 1x4 grid, note that if inputs are of different sizes unused gaps might appear, as not all of output video is used.
```
xstack=inputs=4:layout=0_0|0_h0|0_h0+h1|0_h0+h1+h2
```
Display 9 inputs into 3x3 grid, note that if inputs are of different sizes unused gaps might appear, as not all of output video is used.
```
xstack=inputs=9:layout=w3_0|w3_h0+h2|w3_h0|0_h4|0_0|w3+w1_0|0_h1+h2|w3+w1_h0|w3+w1_h1+h2
```