[FFmpeg-cvslog] doc: Add -list_formats all example for video4linux2

[Jonas Lindgren]

ffmpeg | branch: master | Jonas Lindgren <jonas.lindgren at gmail.com> | Fri Mar  6 23:02:34 2015 +0100| [cecf45b2bfbb85e9e59f355428fbd4d8cbc652a8] | committer: Luca Barbato

doc: Add -list_formats all example for video4linux2

Signed-off-by: Luca Barbato <lu_zero at gentoo.org>

> http://git.videolan.org/gitweb.cgi/ffmpeg.git/?a=commit;h=cecf45b2bfbb85e9e59f355428fbd4d8cbc652a8
---

 doc/indevs.texi |    3 +++
 1 file changed, 3 insertions(+)

diff --git a/doc/indevs.texi b/doc/indevs.texi
index e514b63..3042790 100644
--- a/doc/indevs.texi
+++ b/doc/indevs.texi
@@ -271,6 +271,9 @@ supported using @command{-list_formats all} for Video4Linux2 devices.
 Some usage examples of the video4linux2 devices with avconv and avplay:
 
 @example
+# List supported formats for a video4linux2 device.
+avplay -f video4linux2 -list_formats all /dev/video0
+
 # Grab and show the input of a video4linux2 device.
 avplay -f video4linux2 -framerate 30 -video_size hd720 /dev/video0