[media] DocBook/media: improve timestamp documentation
authorHans Verkuil <hverkuil@xs4all.nl>
Fri, 8 May 2015 10:55:01 +0000 (07:55 -0300)
committerMauro Carvalho Chehab <mchehab@osg.samsung.com>
Mon, 18 May 2015 19:27:31 +0000 (16:27 -0300)
Explain which clock was used to make the timestamp.

Signed-off-by: Hans Verkuil <hans.verkuil@cisco.com>
Signed-off-by: Mauro Carvalho Chehab <mchehab@osg.samsung.com>

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