[gstreamer-bugs] [Bug 588261] New: [mpegtsmux] allow the PCR to be in a PID of its own

[GStreamer (bugzilla.gnome.org)]

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  GStreamer | gst-plugins-bad | Ver: git
           Summary: [mpegtsmux] allow the PCR to be in a PID of its own
           Product: GStreamer
           Version: git
          Platform: Other
        OS/Version: All
            Status: UNCONFIRMED
          Severity: enhancement
          Priority: Normal
         Component: gst-plugins-bad
        AssignedTo: gstreamer-bugs at lists.sourceforge.net
        ReportedBy: vanista at gmail.com
         QAContact: gstreamer-bugs at lists.sourceforge.net
     GNOME version: Unversioned Enhancement
   GNOME milestone: Unspecified


I'd like to open a discussion on the feature of having the PCR in a distinct
stream rather than associated to an existing audio or video stream for a given
program.

The Transport Stream standard (ISO/IEC 13818) allows both use cases, but I've
observed that most professional video broadcasting equipment will separate the
PCR from the PES streams and put it in a distinct PID. Maybe some playback
devices only support this presentation model.

I've analyzed the tsmux library used in the mpegtsmux plugin and it looks like
the PCR is solidly related to the PES, so this feature isn't a simple matter of
creating a new blank PID and setting it as PCR. In fact, the library doesn't
allow creating a new PID that doesn't have a valid stream type.

In order to implement this without rewriting the whole lib, I think we could
write a PRC stream creator and make some sort of association between one of the
PES and this distinct PCR stream so that the existing PCR mechanism continues
to work.


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