[Bug 747965] New: gstrtppayload: payload type could be inconsistent in some payloader, which have pre-defined pt by RFC standard

[GStreamer (GNOME Bugzilla)]

https://bugzilla.gnome.org/show_bug.cgi?id=747965

            Bug ID: 747965
           Summary: gstrtppayload: payload type could be inconsistent in
                    some payloader, which have pre-defined pt by RFC
                    standard
    Classification: Platform
           Product: GStreamer
           Version: git master
                OS: All
            Status: NEW
          Severity: normal
          Priority: Normal
         Component: gst-plugins-good
          Assignee: gstreamer-bugs at lists.freedesktop.org
          Reporter: zzoon.ko at samsung.com
        QA Contact: gstreamer-bugs at lists.freedesktop.org
     GNOME version: ---

This is related to the issue https://bugzilla.gnome.org/show_bug.cgi?id=747839

Sometimes app set dynamic payload type, not standard payload type, the pt is
changed to standard later (or not for other payloaders).
This causes inconsistent result during rtp streaming.

[ Things needed to be consistent ]
1.  Its payload type has to be set in caps in src_template
All done

2. _init function has to set payload type initially (for the case that app is
not setting pt property)
Not done:
gstrtpg722pay
gstrtph263pay
gstrtppcmapay
gstrtppcmupay
gstrtpmpapay
gstrtpjpegpay
gstrtpL16pay

3. _setcaps needs to update payload type.
Not done:
gstrtpg722pay
gstrtpgsmpay
gstrtpmp2tpay
gstrtpmpapay
gstrtpmpvpay
gstrtpjpegpay
gstrtpL16pay

Is there any other things to be investigated? Or Did I miss something?
If so, let me know please.

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