ffmpeg concat error unable to find a suitable output format

Question

I\'m trying to batch concat a outro video to multiple videos. I am just tetsing it using the following command: ffmpeg -i test.mp4 -i hello.mp4 -filter comp lex “[0:v:0]

Answer 1

1. Change -filter complex to -filter_complex
2. Replace the “smart / fancy” quotes with normal double quotes (").