[gstreamer-bugs] [Bug 503023] New: Let multipartdemux work in live mode.

[GStreamer (bugzilla.gnome.org)]

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  GStreamer | gst-plugins-good | Ver: HEAD CVS
           Summary: Let multipartdemux work in live mode.
           Product: GStreamer
           Version: HEAD CVS
          Platform: Other
        OS/Version: All
            Status: UNCONFIRMED
          Severity: enhancement
          Priority: Normal
         Component: gst-plugins-good
        AssignedTo: gstreamer-bugs at lists.sourceforge.net
        ReportedBy: wouter at mind.be
         QAContact: gstreamer-bugs at lists.sourceforge.net
     GNOME version: Unversioned Enhancement
   GNOME milestone: Unspecified


multipartdemux emits buffers with a -1 timestamp. This breaks data from live
sources, and downstream elements that need timestamps, e.g. matroskamux.
I propose timestamping the buffers with the timestamp of the last buffer that
was pushed into the source pad.

E.g. a non-live push source:
GST_DEBUG="*:3,matroskamux:5,multipartdemux:5" gst-launch -vt souphttpsrc 
location='http://foo.org/mjpeg?0=0&y0=0&x1=704&y1=576&fps=15' ! multipartdemux
! image/jpeg,width=704,height=576,framerate=15/1 ! typefind ! matroskamux !
filesink location=4cif15fps1.mkv

0:00:00.815873000 24890 0x8124e60 DEBUG       multipartdemux
multipartdemux.c:533:gst_multipart_demux_chain:<multipartdemux0> pushing buffer
with timestamp 99:99:99.999999999
0:00:00.816073000 24890 0x8124e60 WARN           matroskamux
matroska-mux.c:1732:gst_matroska_mux_write_data:<matroskamux0:video_0> Invalid
buffer timestamp; dropping buffer


E.g. a live push source:
GST_DEBUG="*:3,matroskamux:5,multipartdemux:5" gst-launch -vt souphttpsrc
do-timestamp=true location='http://foo.org/mjpeg?0=0&y0=0&x1=704&y1=576&fps=15'
! multipartdemux ! image/jpeg,width=704,height=576,framerate=15/1 ! typefind !
matroskamux ! filesink location=4cif15fps1.mkv

0:00:16.272564000 24248 0x8124e88 DEBUG       multipartdemux
multipartdemux.c:533:gst_multipart_demux_chain:<multipartdemux0> pushing buffer
with timestamp 0:00:15.539441000

0:00:16.272653000 24248 0x8124e88 LOG            matroskamux
matroska-mux.c:1743:gst_matroska_mux_write_data:<matroskamux0> have video
keyframe, ts=0:00:15.539441000


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