Does decodebin need parser

[deeps8us]

I have a decoder available for my codec. When trying from the app, Decodebin
is trying my decoder, but not selecting.

GST_ELEMENT_FACTORY
gstelementfactory.c:851:gst_element_factory_list_filter: Trying
<my_plugin>
playbin gstplaybin2.c:4193:autoplug_factories_cb:<media_pipeline> found
factories (nil)

Issue looks very similar to
http://gstreamer-devel.966125.n4.nabble.com/MP3-playback-td4665707.html
where they solved by adding a parser.
I dont have a parser element.  If appropriate decoder is present, why is
parser required?



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