Pitivi: render freezes (GStreamer encountered a general stream error. (matroska-demux.c(4492): gst_matroska_demux_loop ())

[David Gross]

When rendering a .webm project in pitivi, the render freezes without displaying an error message. If I run from the command line, the following error shows up: "GStreamer encountered a general stream error. (matroska-demux.c(4492): gst_matroska_demux_loop ()"

If I can figure out how I'll attach the compressed debug logs I generated via

PITIVI_DEBUG=*:5 GST_DEBUG=2 pitivi myProject.xptv > debug.log 2>&1

[Ubuntu 12.04.1 LTS]

pitivi:
  Installed: 0.15.2-0ubuntu0.1
  Candidate: 0.15.2-0ubuntu0.1
  Version table:
 *** 0.15.2-0ubuntu0.1 0
        500 http://us.archive.ubuntu.com/ubuntu/ precise-updates/main i386 Packages
        100 /var/lib/dpkg/status
     0.15.1-0ubuntu1 0
        500 http://us.archive.ubuntu.com/ubuntu/ precise/main i386 Packages

[David Gross (dave-eorbit)]

A more complete error trace:

Traceback (most recent call last):
  File "/usr/lib/pitivi/python/pitivi/ui/timelinecanvas.py", line 246, in _selectionEnd
    self.timeline.setSelectionTo(set(), 0)
  File "/usr/lib/pitivi/python/pitivi/timeline/timeline.py", line 1875, in setSelectionTo
    self.selection.setSelection(selection, mode)
  File "/usr/lib/pitivi/python/pitivi/timeline/timeline.py", line 527, in setSelection
    self.emit("selection-changed")
  File "/usr/lib/pitivi/python/pitivi/signalinterface.py", line 151, in emit
    *args, **kwargs)
  File "/usr/lib/pitivi/python/pitivi/signalinterface.py", line 126, in emit
    res = cb(*ar, **kw)
  File "/usr/lib/pitivi/python/pitivi/timeline/timeline.py", line 1548, in _selectionChanged
    self.emit("selection-changed")
  File "/usr/lib/pitivi/python/pitivi/signalinterface.py", line 151, in emit
    *args, **kwargs)
  File "/usr/lib/pitivi/python/pitivi/signalinterface.py", line 126, in emit
    res = cb(*ar, **kw)
  File "/usr/lib/pitivi/python/pitivi/ui/clipproperties.py", line 612, in _selectionChangedCb
    self.zoom_scale.set_value(1.0)
AttributeError: 'TransformationProperties' object has no attribute 'zoom_scale'
ERROR [25766] [0x -48d0a500] "<Pipeline at 0xa08d88c>" pipeline Dec 12 15:29:48 _handleErrorMessage: error from /GstPipeline:pipeline0/GstBin:bin0/GnlComposition:gnlcomposition0/GnlSource:gnlsource: FileSourceFactory18/GstBin:bin19/pitivi+elements+singledecodebin+SingleDecodeBin:pitivi+elements+singledecodebin+singledecodebin18/GstMatroskaDemux:matroskademux5 (__main__.GstMatroskaDemux): GStreamer encountered a general stream error. (matroska-demux.c(4492): gst_matroska_demux_loop (): /GstPipeline:pipeline0/GstBin:bin0/GnlComposition:gnlcomposition0/GnlSource:gnlsource: FileSourceFactory18/GstBin:bin19/pitivi+elements+singledecodebin+SingleDecodeBin:pitivi+elements+singledecodebin+singledecodebin18/GstMatroskaDemux:matroskademux5:
stream stopped, reason not-negotiated) (/usr/lib/pitivi/python/pitivi/pipeline.py:858)