[Bug 777984] New: isomp4: initial ftyp/moov streamheader missing

[GStreamer (GNOME Bugzilla)]

https://bugzilla.gnome.org/show_bug.cgi?id=777984

            Bug ID: 777984
           Summary: isomp4: initial ftyp/moov streamheader missing
    Classification: Platform
           Product: GStreamer
           Version: git master
                OS: Linux
            Status: NEW
          Severity: normal
          Priority: Normal
         Component: gst-plugins-good
          Assignee: gstreamer-bugs at lists.freedesktop.org
          Reporter: gnome-bugzilla at dreambox.guru
        QA Contact: gstreamer-bugs at lists.freedesktop.org
     GNOME version: ---

i've tried to randomly enter a stream generated with mp4dashmux from
https://bugzilla.gnome.org/show_bug.cgi?id=668091 to play it in the browser
using MSE. unfortunately, this failed, using a tcpserversink element and trying
the various sync-methods. looking at the captured streams i discovered that the
global headers are missing:

when it should start with:
0000 0000: 00 00 00 1C 66 74 79 70  69 73 6F 35 00 00 00 01  ....ftyp iso5....  
0000 0010: 69 73 6F 35 69 73 6F 32  64 61 73 68 00 00 03 45  iso5iso2 dash...E  
0000 0020: 6D 6F 6F 76 00 00 00 6C  6D 76 68 64 00 00 00 00  moov...l mvhd....  

the randomly entered streams only start with:
0000 0000: 00 00 00 14 73 74 79 70  6D 73 64 68 00 00 00 00  ....styp msdh....  
0000 0010: 6D 73 64 68 00 00 00 60  6D 6F 6F 66 00 00 00 10  msdh...` moof....  
0000 0020: 6D 66 68 64 00 00 00 00  00 00 00 6B 00 00 00 48  mfhd.... ...k...H  


qtmux does implement some streamheader handling, but it seems to be missing
something for my use case. i'll investiage.

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