avformat/dashenc: add descriptor which is useful to the scheme defined by ISO/IEC 23009-1:2014/Amd.2:2015.

Signed-off-by: leozhang <leozhang@qiyi.com>
pull/317/head
Leo Zhang 6 years ago committed by Karthick J
parent 18928e2bb4
commit 116303cd24
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