ffmpegHow to use filter_complex to apply filters to videos

When you have multiple inputs or you need to apply multiple filters, you can use filter_complex. This example resizes given image to 50x50 and places it (overlays) over given video:

ffmpeg -i in.mp4 -i in.png -filter_complex "[1]scale=50:50[in2];[0][in2]overlay" out.mp4ctrl + cyoutubegithub

`-i in.mp4` first input (can be referred as `[0]`)	`-i in.png` second input (can be referred as `[1]`)
`-filter_complex` applies specified video/audio complex filter	`[1]scale=50:50[in2]` applies `scale` filter to input `[1]` (`in.png` image) and name the result as `[in2]` (so it can be referred later)
`[0][in2]overlay` applies overlay filter with inputs `[0]` (`in.mp4`) and `[in2]` (result of previous filtering)	`out.mp4` resulting video file

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