CCC media serves several recording formats, to name a few:
- application/x-subrip
- video/mp4
- video/webm
- audio/mpeg
- audio/opus
- audio/mpeg
not all of them are suitable for a video frame. If available we should prefer
video/mp4 due to its minimal data rates.
Closes: https://github.com/searxng/searxng/issues/3431
Signed-off-by: Markus Heiser <markus.heiser@darmarit.de>