Merge commit 'cecf45b2'

* commit 'cecf45b2':
  doc: Add -list_formats all example for video4linux2

Conflicts:
	doc/indevs.texi
Merged-by: Michael Niedermayer <michaelni@gmx.at>

doc/indevs.texi

@@ -904,6 +904,12 @@ conversion into the real time clock.
 Some usage examples of the video4linux2 device with @command{ffmpeg}
 and @command{ffplay}:
 @itemize
+@item
+List supported formats for a video4linux2 device:
+@example
+ffplay -f video4linux2 -list_formats all /dev/video0
+@end example
+
 @item
 Grab and show the input of a video4linux2 device:
 @example