The Windows Media Player only shows a black screen and the content is missing

1) check playback locally via XTERM and GStreamer like this: gst-launch-0.10 playbin2 uri=file:///tmp/MP4-01-Mpeg4-1920x1080.mp4 Result: The video playback works fine. Summary: Codecs and GStreamer are working, which can be checked with the local playback. The problem is that playback does not work in the Citrix session.

2) failure to play certain codecs can be workaround as following

1. Temporarily add the configuration option "SpeedScreenMMAVerbose=On" to the [WFClient] section of $Home/.ICAClient/wfclient.ini, for example.
2. Restart WFICA from a selfservice that has been started from a terminal.
3. Play a video that generates this error.
4. Note (in the tracing output) the mime-type associated with the missing plugin trace, or the mime-type that should be supported but does not play (for example, "video/x-h264..").
5. Edit $ICAROOT/config/MediaStreamingConfig.tbl; on the line with the noted mime-type insert a '?' between the ':' and the mime type. This disables the format.
6. Repeat steps 2-5 (above) for other media formats that produce this error condition.

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Problem Cause

Might be missing codecs