[Bug 754664] Can't link tsdemux to aacparse and rtpmp4gpay

[GStreamer (GNOME Bugzilla)]

https://bugzilla.gnome.org/show_bug.cgi?id=754664

--- Comment #5 from Thiago Sousa Santos <thiagossantos at gmail.com> ---
(In reply to davywj from comment #3)
> Hi Thiago Sousa Santos
> 
> Thank you. But I'm a little confused as the second graph I uploaded without
> rtpmp4gpay shows aacparse accepting mpegversion=2 on the left side and
> pushing out mpegversion=4 on the right side. 

In the 2nd pipeline you have fakesink instead of the payloader. The payloader
only accepts mpegversion=4 so when aacparse and tsdemux are linking aacparse
will report only to accept mpegversion=4 as it can't convert from mpegversion=2
to 4. It can actually fix the caps from 2 to 4, but that's not converting it.
So it fails linking because it is assumed that tsdemux is not lying on its
caps.

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