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https://issues.apache.org/jira/browse/GUACAMOLE-1642?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=17870048#comment-17870048
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Nick Couchman commented on GUACAMOLE-1642:
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Oops, I'll get that added...
> Add support for specifying VNC "encodings" parameter in webapp UI
> -----------------------------------------------------------------
>
> Key: GUACAMOLE-1642
> URL: https://issues.apache.org/jira/browse/GUACAMOLE-1642
> Project: Guacamole
> Issue Type: Improvement
> Components: guacamole, guacamole-ext
> Reporter: Adam N Outler
> Assignee: Nick Couchman
> Priority: Minor
> Fix For: 1.6.0
>
>
> Guacamole's VNC support defaults to excluding the "Tight" (lossy JPEG)
> encoding, but the Tight encoding cannot be manually specified from the UI.
> This makes it difficult to connect to VNC servers like PiKVM that only
> support Tight and H.264 encodings.
> h3. guacd log
> {code:none}
> guacd[8]: INFO: Creating new client for protocol "vnc"
> guacd[8]: INFO: Connection ID is "$82d33ae2-e13d-4f23-b7b9-1acd4c8308c4"
> guacd[2826]: DEBUG: Processing instruction: size
> ...
> guacd[2826]: DEBUG: Parameter "encodings" omitted. Using default value of
> "zrle ultra copyrect hextile zlib corre rre raw".
> ...
> {code}
> h3. VNC server log
> {code:none}
> [root@pikvm kvmd]# kvmd-vnc --run
> kvmd.keyboard.keysym INFO --- Reading keyboard layout
> /usr/share/kvmd/keymaps/en-us ...
> kvmd.apps.vnc.server INFO --- Listening VNC on TCP [::]:5900 ...
> kvmd.apps.vnc.server INFO --- [entry]
> [::ffff:192.168.1.107]:54480: Connected client
> kvmd.apps.vnc.rfb INFO --- [entry]
> [::ffff:192.168.1.107]:54480: Starting client tasks ...
> kvmd.apps.vnc.rfb INFO --- [main]
> [::ffff:192.168.1.107]:54480: Using RFB version 3.8
> kvmd.apps.vnc.rfb INFO --- [main]
> [::ffff:192.168.1.107]:54480: Using VNCAuth security type
> kvmd.apps.vnc.rfb INFO --- [main]
> [::ffff:192.168.1.107]:54480: VNCAuth access granted for user 'admin'
> kvmd.apps.vnc.server INFO --- [kvmd]
> [::ffff:192.168.1.107]:54480: Waiting for the SetEncodings message ...
> kvmd.apps.vnc.rfb INFO --- [main]
> [::ffff:192.168.1.107]:54480: Client features (SetEncodings): ...
> kvmd.apps.vnc.rfb INFO --- [main]
> [::ffff:192.168.1.107]:54480: ... encodings=frozenset({0, 1, 2, -253, 4, 5,
> 6, -131072, -131071, 9, -65527, -131070, -131069, 16, -240, -239, -232, -223,
> -309})
> kvmd.apps.vnc.rfb INFO --- [main]
> [::ffff:192.168.1.107]:54480: ... has_resize=True
> kvmd.apps.vnc.rfb INFO --- [main]
> [::ffff:192.168.1.107]:54480: ... has_rename=False
> kvmd.apps.vnc.rfb INFO --- [main]
> [::ffff:192.168.1.107]:54480: ... has_leds_state=False
> kvmd.apps.vnc.rfb INFO --- [main]
> [::ffff:192.168.1.107]:54480: ... has_ext_keys=False
> kvmd.apps.vnc.rfb INFO --- [main]
> [::ffff:192.168.1.107]:54480: ... has_tight=False
> kvmd.apps.vnc.rfb INFO --- [main]
> [::ffff:192.168.1.107]:54480: ... tight_jpeg_quality=0
> kvmd.apps.vnc.rfb INFO --- [main]
> [::ffff:192.168.1.107]:54480: ... has_h264=False
> kvmd.apps.vnc.rfb ERROR --- [main]
> [::ffff:192.168.1.107]:54480: Error: Tight JPEG encoding is not supported by
> client: RfbClientEncodings(encodings=frozenset({0, 1, 2, -253, 4, 5, 6,
> -131072, -131071, 9, -65527, -131070, -131069, 16, -240, -239, -232, -223,
> -309}), has_resize=True, has_rename=False, has_leds_state=False,
> has_ext_keys=False, has_tight=False, tight_jpeg_quality=0, has_h264=False)
> kvmd.apps.vnc.rfb INFO --- [streamer]
> [::ffff:192.168.1.107]:54480: Cancelling subtask ...
> kvmd.apps.vnc.rfb INFO --- [fb_sender]
> [::ffff:192.168.1.107]:54480: Cancelling subtask ...
> kvmd.apps.vnc.rfb INFO --- [kvmd]
> [::ffff:192.168.1.107]:54480: Cancelling subtask ...
> kvmd.apps.vnc.rfb INFO --- [entry]
> [::ffff:192.168.1.107]:54480: Connection closed
> ^Ckvmd.apps.vnc.server INFO --- Bye-bye
> {code}
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