ges-launch-1.0 playing webm with start set to 0 failed?

[Guofeng Zhang]

Hi,

Using ges-launch-1.0 to play a mp4 file runs well, but when playing the 
webm files, it runs well with the start argument set to the value other 
than 0. If the start argument is set to 0.0, I got:

ERROR from element matroskademux2: GStreamer encountered a general 
stream error.
Debugging info: matroska-demux.c(4637): gst_matroska_demux_loop (): 
/GESPipeline:gespipeline0/GESTimeline:gestimeline0/GESVideoTrack:gesvideotrack0/NleComposition:video_nlecomposition0/GstBin:current-bin/NleSource:nlesource2/GstBin:videosrcbin/GstURIDecodeBin:uridecodebin0/GstDecodeBin:decodebin4/GstMatroskaDemux:matroskademux2:
stream stopped, reason not-negotiated

The following is the command I use:

ges-launch-1.0 +clip sintel_trailer-480p.webm inpoint=1.0 duration=5.0 
start=0.0

The webm file is got from 
http://docs.gstreamer.com/media/sintel_trailer-480p.webm

I tried other webm files, and got the same issue.

Your help is appreciated.

Thanks.

guofeng