[Bug 789247] New: Playback with playbin3 of MPEG TS file with two stream collections for a program does not preroll

[GStreamer (GNOME Bugzilla)]

https://bugzilla.gnome.org/show_bug.cgi?id=789247

            Bug ID: 789247
           Summary: Playback with playbin3 of MPEG TS file with two stream
                    collections for a program does not preroll
    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: mkid.dev at gmail.com
        QA Contact: gstreamer-bugs at lists.freedesktop.org
     GNOME version: ---

Created attachment 361943
  --> https://bugzilla.gnome.org/attachment.cgi?id=361943&action=edit
MPEG TS with program, which starts with only video stream, but shortly has
video and audio streams

Brief analysis done by Edward Hervey at Hackfest identified at least two
problems:
- mpegtsdemux does not add audio pad for second streams collection,
- playbin3 unnecessary blocks streaming.

Information about TS file from tsinfo tool:
Packet 1 is PAT
Program list:
    Program 1 -> PID 0100 (256)

Packet 2 is PMT with PID 0100 (256)
  Program 1, version 0, PCR PID 1fff (8191)
  Program streams:
    PID 0101 ( 257) -> Stream type 1b ( 27) H.264/14496-10 video (MPEG-4/AVC)

Packet 159 is PMT with PID 0100 (256) - content changed
  Program 1, version 1, PCR PID 0101 (257)
  Program streams:
    PID 0101 ( 257) -> Stream type 1b ( 27) H.264/14496-10 video (MPEG-4/AVC)
    PID 0102 ( 258) -> Stream type 0f ( 15) 13818-7 Audio with ADTS transport
syntax

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