The handshake error usually comes up if/when the server and the credentials sent to it to match. If you are on a paid site, you need to do some manual configurations to make sure it authenticates, as it stands now, the GUI is not there for RTMPDump, so it will assume that its publicly/anonymously accessible resource, so when that is not the case, it will fail (as in sites with authentication required to access the resources).
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