[Bug 767778] New: h264parse: Does not provide complete caps for alignment=nal in the beginning

[GStreamer (GNOME Bugzilla)]

https://bugzilla.gnome.org/show_bug.cgi?id=767778

            Bug ID: 767778
           Summary: h264parse: Does not provide complete caps for
                    alignment=nal in the beginning
    Classification: Platform
           Product: GStreamer
           Version: git master
                OS: Linux
            Status: NEW
          Severity: normal
          Priority: Normal
         Component: gst-plugins-bad
          Assignee: gstreamer-bugs at lists.freedesktop.org
          Reporter: slomo at coaxion.net
        QA Contact: gstreamer-bugs at lists.freedesktop.org
     GNOME version: ---

When h264parse e.g. reads a raw bytestream h264 file, and as output
alignment=nal is requested, it will first provide caps like
video/x-h264,stream-format=... but without width/height/profile/etc.

It seems like it does not wait until it received the PPS/SPS in this mode
before providing caps and outputting data, which it probably should.


In practice this is causing negotiation errors if there is an element that
wants nal alignment but also requires width/height to be known in caps.

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