Fix cancellation of thumbnailer loop on input stream close #21
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This PR addresses a bug introduced with #20 for issue #16 where the
Peersnap(thumbnailer)would not exit it's RTP read loop when input stream was stopped or closed. The issue seemed to appear when using OBS to stream on either RTMP or FTL protocols.The fix required deriving a
contextWithCancelfrom the parentcontextin control and invoking the cancel func incontrol.StopStream