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Why guacamole client do not support “Screen Recording and replay”?
How can replay the record file with a suffix m4v?
The recordings are performed by guacd, not by the Guacamole Client, so you have to find some way to retrieve them from the Guacamole Server host in order to get them to play back. There is an example project in the Guacamole Client tree for playing back recordings:
As far as converting to m4v, there's a program in the Guacamole Server code called "guacenc" that will convert the recording into a video. In order for this binary to be built you need to have FFmpeg and its related libraries installed, and you'll be able to encode the videos. Once you have the output from guacenc you can use FFmpeg or any other video conversion tool of your choice to convert it into various formats. There is effort underway (JIRA issue and open pull request) to add support for a variety of video output formats to guacenc. I can't remember what the default output format is at the moment, but it might be MPEG4.