Add a warning

7 jobs for add_mp4_support in 4 minutes and 37 seconds (queued for 2 seconds)
Status Job ID Name Coverage
  Linting
passed #77673
bandit

00:00:38

passed #77676
mypy

00:00:47

passed #77675
pyflakes

00:00:29

passed #77674
pylint

00:01:11

 
  Test
passed #77679
whitewhale
tests:archlinux

00:02:06

passed #77677
tests:debian

00:01:37

100.0%
passed #77678
whitewhale
tests:fedora

00:03:25