Re: Increase FPS in VNC Session
On Tue, May 15, 2018 at 9:58 AM, Nick Couchmanwrote: > On Wed, Apr 11, 2018 at 10:22 AM, JimL wrote: > >> Hi, >> >> Is it possible to increase the frame rate received through WebSocket in >> VNC >> session? >> >> For example, in TurboVNC, in case of low network, I can adjust the image >> compression level to increase my frame rate. Is this possible through >> Guacamole? Is it also possible to disable any image compression on >> Guacamole >> to give lossless image output? >> > > Guacamole currently lacks the settings for compression to be able to do > this within the Guacamole Client interface; however, it can be done in > source code. If you find such settings useful, you can open a JIRA issue > and request it as a feature. However, compression is generally only a > problem if your system is either CPU or memory-bound, so if you're not > seeing excessive CPU utilization or memory problems, disabling it may not > make any difference. > In fact, disabling compression would likely result in the framerate being unusably low. Increasing the amount of data that has to be processed client-side is not likely to improve performance. Improving the heuristic selection of compression algorithm and/or the efficiency with which that compression is applied likely would, though. Currently, Guacamole should already do a pretty decent job of deciding whether PNG or JPEG / WebP is appropriate for given updates based on a quick heuristic judgement of content and update frequency. I have some experimental changes which go a bit further than that, adjusting the lossy compression quality based on client processing lag: https://github.com/mike-jumper/guacamole-server/tree/dynamic-quality - Mike
Re: Increase FPS in VNC Session
On Wed, Apr 11, 2018 at 10:22 AM, JimLwrote: > Hi, > > Is it possible to increase the frame rate received through WebSocket in VNC > session? > > For example, in TurboVNC, in case of low network, I can adjust the image > compression level to increase my frame rate. Is this possible through > Guacamole? Is it also possible to disable any image compression on > Guacamole > to give lossless image output? > Guacamole currently lacks the settings for compression to be able to do this within the Guacamole Client interface; however, it can be done in source code. If you find such settings useful, you can open a JIRA issue and request it as a feature. However, compression is generally only a problem if your system is either CPU or memory-bound, so if you're not seeing excessive CPU utilization or memory problems, disabling it may not make any difference. > > If such modifications are possible, could you give me some pointers on how > to go about it in the source code? > > They should be possible. I suggest taking a look at the LibVNCServer/LibVNCClient documentation: https://libvnc.github.io/doc/html/group__libvncclient__api.html It contains information on the function calls for setting encoding and compression. The Guacamole Server code initializes the VNC (rfb) client, here: https://github.com/apache/guacamole-server/blob/b61a6ab758177b4d4cec4a3a0a2f51a3e76c3772/src/protocols/vnc/vnc.c#L127 You can see there that the encodings get initialized from the provided options, and then the call to rfbInitClient contains two parameters set to NULL - you can set those as documented in the API documentation and see what happens. -Nick
Increase FPS in VNC Session
Hi, Is it possible to increase the frame rate received through WebSocket in VNC session? For example, in TurboVNC, in case of low network, I can adjust the image compression level to increase my frame rate. Is this possible through Guacamole? Is it also possible to disable any image compression on Guacamole to give lossless image output? If such modifications are possible, could you give me some pointers on how to go about it in the source code? Thanks! -- Sent from: http://apache-guacamole-general-user-mailing-list.2363388.n4.nabble.com/