Call FFMPEG with Complex Filter from Ports

I first wanted to get it working to optimize later so I avoid spending a lot of time for nothing.

Luckily, it’s working now with complex filters.

ffmpeg_args = ~W(-i interception.mp4 -filter_complex [0:a]volume=1[final_audio] -map [final_video] -c:v libx264 final_output.mp4)