How can it be possible since you record an online webex meeting and the output is WRF, isn't ARF?
If there is no audio you might did not click on the microphone when the meeting is going on, as for no video output that is really hard to say. If it is an ARF file, you should play with NETWORK Recording Player, and if it is WRF as you said, although i do not think it is possible, you should play it with WebeXplayer, they are 2 different application you must notice. If still not work, try to use some other video converter to convert them into common formats like MP4 or AVI from the WMV file you just converted into like the tutorial says: http://www.videoconverterfactory.com/tips/wrf-to-mp4.html.
But I do think the most possibility is that you have used a wrong player. Download the ARF Player- Webex Networking Player here and have a try again https://www.webex.com/play-webex-recording.html
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After you have used WebEx Online Confernce and downloaded the recorded video the file will be saved as ARF. As for WRF, it is generated by another program named WebEx Recorder which is a screen capture tool. These are all proprietary formats of Cisco itself. If you still don't understand you may refer to this article and in the end you will find an exhaustice comparsion between these two types of files.http://www.videoconverterfactory.com/tips/how-to-use-webex.html
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