$is_video
Usage: $is_video()
Category: conditional
Implemented: Picard 2.2
Description:
Returns true, if the track being processed is shown as being a video.
Example:
The following statements will return the values indicated:
$is_video() ==> "1" (True, if the track is a video)
$is_video() ==> "" (False, if the track is not a video)