Pipeline hangs in gst_qtdemux_loop processing a video

[Angel Guzman Maeso]

I get this errors in terminal. The video rendering hangs and I have to restart the render.

$ pitivi

(pitivi:9440): GStreamer-CRITICAL **: gst_event_new_new_segment_full: assertion 'format != GST_FORMAT_UNDEFINED' failed

(pitivi:9440): GStreamer-CRITICAL **: gst_pad_push_event: assertion 'event != NULL' failed

(pitivi:9440): GStreamer-CRITICAL **: gst_event_new_new_segment_full: assertion 'format != GST_FORMAT_UNDEFINED' failed

(pitivi:9440): GStreamer-CRITICAL **: gst_pad_push_event: assertion 'event != NULL' failed

(pitivi:9440): GStreamer-CRITICAL **: gst_event_new_new_segment_full: assertion 'format != GST_FORMAT_UNDEFINED' failed

(pitivi:9440): GStreamer-CRITICAL **: gst_pad_push_event: assertion 'event != NULL' failed
ERROR [ 9440] [0x -48adb940] "<Pipeline at 0xace7fcc>" pipeline oct 20 13:18:32 _handleErrorMessage: error from /GstPipeline:pipeline0/GstBin:bin0/GnlComposition:gnlcomposition0/GnlSource:gnlsource: VideoTestSourceFactory18/GstBin:bin28/GstVideoTestSrc:videotestsrc1 (__main__.GstVideoTestSrc): GStreamer encontró un error general de flujo. (gstbasesrc.c(2625): gst_base_src_loop (): /GstPipeline:pipeline0/GstBin:bin0/GnlComposition:gnlcomposition0/GnlSource:gnlsource: VideoTestSourceFactory18/GstBin:bin28/GstVideoTestSrc:videotestsrc1:
streaming task paused, reason not-negotiated (-4)) (/usr/lib/pitivi/python/pitivi/pipeline.py:858)
ERROR [ 9440] [0x -48adb940] "<Pipeline at 0xace7fcc>" pipeline oct 20 13:18:33 _handleErrorMessage: error from /GstPipeline:pipeline0/GstBin:bin0/GnlComposition:gnlcomposition0/GnlSource:gnlsource: VideoTestSourceFactory18/GstBin:bin28/GstVideoTestSrc:videotestsrc1 (__main__.GstVideoTestSrc): GStreamer encontró un error general de flujo. (gstbasesrc.c(2625): gst_base_src_loop (): /GstPipeline:pipeline0/GstBin:bin0/GnlComposition:gnlcomposition0/GnlSource:gnlsource: VideoTestSourceFactory18/GstBin:bin28/GstVideoTestSrc:videotestsrc1:
streaming task paused, reason not-negotiated (-4)) (/usr/lib/pitivi/python/pitivi/pipeline.py:858)

ProblemType: Bug
DistroRelease: Ubuntu 13.10
Package: pitivi 0.15.2-0.1ubuntu1
ProcVersionSignature: Ubuntu 3.8.0-13.23-generic 3.8.3
Uname: Linux 3.8.0-13-generic i686
NonfreeKernelModules: fglrx
ApportVersion: 2.12.5-0ubuntu2
Architecture: i386
Date: Sun Oct 20 15:39:43 2013
InstallationDate: Installed on 2013-02-03 (259 days ago)
InstallationMedia: Ubuntu 10.04 LTS "Lucid Lynx" - Release i386 (20100429)
MarkForUpload: True
PackageArchitecture: all
SourcePackage: pitivi
UpgradeStatus: Upgraded to saucy on 2013-02-03 (258 days ago)