You can configure decoding and network protocol options for remote desktop and application sessions that use the VMware Blast display protocol.

About this task

H.264 decoding has the following restrictions:

  • Multiple monitors are not supported.

  • The maximum resolution that is supported depends on the capability of the graphical processing unit (GPU) on the client. A GPU that can support 4K resolution for JPEG/PNG might not be able to support 4K resolution for H.264. If a resolution for H.264 is not supported, Horizon Client uses JPEG/PNG instead.

H.264 decoding is supported on AMD, Nvidia, and Intel GPUs. H.264 decoding requires that the graphics library OpenGL 3.2 or later is installed for AMD and Nvidia GPUs.

To use H.264 with Intel GPU, the Intel VA-API driver and the GLX VA-API libraries are required. Running the command vainfo should show the H.264 profiles. If the VA-API driver version is 1.2.x or earlier, you must add the entry mks.enableGLBasicRenderer = TRUE to /etc/vmware/config, /usr/lib/vmware/config or ~/.vmware/config. The configuration files are processed in the following order:

  1. /etc/vmware/config

  2. /usr/lib/vmware/config

  3. ~/.vmware/config

With Red Hat 7.2, Intel GPU, Intel driver version 1.2 or earlier, OpenGL 3.2, and H.264 enabled, you must add the following entries to one of the three configuration files to avoid display issues such as a black screen.


H.264 is not supported on SLED 11 SP4 with Intel GPU because the xorg version is too old.


This feature requires Horizon Agent 7.0 or later.


  1. In the desktop and application selector window, select Connection > Settings or click the Settings icon in the upper-right portion of the window, and select VMware Blast in the left pane of the Settings window.
  2. Configure the decoding and network protocol options.




    Select this option to allow H.264 decoding in Horizon Client. When this option is selected (the default setting), Horizon Client uses H.264 decoding if the agent supports H.264 software encoding. If the agent does not support H.264 software encoding, Horizon Client uses JPG/PNG decoding.

    Deselect this option to always use JPG/PNG decoding.


    Select this option to allow UDP networking in Horizon Client. When this option is selected (the default setting), Horizon Client uses UDP networking if UDP connectivity is available. If UDP networking is blocked, Horizon Client uses TCP networking.

    Deselect this option to always use TCP networking.


    UDP is disabled by default on a Horizon remote desktop. For UDP to work, it must be enabled on the desktop, the client, and the Blast Secure Gateway (BSG).


Your changes take effect the next time a user connects to a remote desktop or application and selects the VMware Blast display protocol. Your changes do not affect existing VMware Blast sessions.