I hardly ever submit videos with sound. I don't have a good quality external mic / audio recorder anyway. So I don't have much choice but to submit silent videos.
By the way, if you want to be grammatically correct in your written text, 'footage' is an uncountable noun. Therefore, there is no such word as 'footages.' You can use the word 'videos' or 'clips' instead for the plural.
Sorry - I'm training to be a teacher in TESOL - that's why the mini grammar lesson slipped out.