Administrator Guide

Figure 6. Horizon tab

a) Select the Enable H264 check box. This option enables the H.264 decoding in Horizon Client. Enabling this option, improves the

performance of high-end applications. To validate the H.264 decoding, add an INI parameter setenv

BlastDebugClientH264=yes, and verify if the H264 basic watermark is displayed in the upper-left corner of the VMware

Blast session window.

The following table describes the performance of H.264 decoder in VMware Horizon sessions that use the VMware Blast display

protocol:

Table 9. Blast H.264 decoding

Screen resolution within VMware

Horizon Blast session

Blast H.264 decoding in VMware

Horizon Blast session

Summary

Session display width is less than or equal

to 1920 resolution.

Blast H.264 decoding is always enabled. Horizon client uses Blast H.264 decoding

even if the H.264 decoder setting is

disabled using GUI or INI options.

Session display width is greater than 1920

resolution.

Blast H.264 decoding is disabled by

default. You can enable Blast H.264

decoding either on the ThinOS GUI or by

deploying the INI parameter.

By default, Horizon client does not use

Blast H.264 decoding. If the Blast H.264

decoder setting is enabled on ThinOS, the

Horizon client uses H.264 decoding.

Enabling H.264 may downgrade the

session performance.

NOTE: A performance tracker is introduced by VMware for performance evaluation and data collection.

b) From the Network Condition drop-down list, select whether to use a condition for your Blast connection.

Global Connection settings