Product Documentation

マルチメディアのポリシー設定

Apr 13, 2017

The Multimedia section contains policy settings for managing streaming audio and video in user sessions.

Limit video quality

This setting specifies the maximum video quality level allowed for an HDX connection. When configured, maximum video quality is limited to the specified value, ensuring that multimedia Quality of Service (QoS) is maintained within an environment.

By default, this setting is not configured.

To limit the maximum video quality level allowed, choose one of the following options:
  • 1080p/8.5mbps
  • 720p/4.0mbps
  • 480p/720kbps
  • 380p/400kbps
  • 240p/200kbps
Note: Playing multiple videos simultaneously on the same server consumes large amounts of resources and may impact server scalability.

Multimedia conferencing

This setting allows or prevents support for video conferencing applications.

By default, video conferencing support is allowed.

When adding this setting to a policy, make sure the Windows Media Redirection setting is present and set to Allowed.

When using multimedia conferencing, make sure the following conditions are met:
  • Manufacturer-supplied drivers for the web cam used for multimedia conferencing must be installed.
  • The web cam must be connected to the user device before initiating a video conferencing session. The server uses only one installed web cam at any given time. If multiple web cams are installed on the user device, the server attempts to use each web cam in succession until a video conferencing session is created successfully.

Optimization for Windows Media multimedia redirection over WAN

This setting enables real-time multimedia transcoding, allowing audio and video media streaming to mobile devices, and enhancing the user experience by improving how Windows Media content is delivered over a WAN.

By default, the delivery of Windows Media content over the WAN is optimized.

When adding this setting to a policy, make sure the Windows Media Redirection setting is present and set to Allowed.

When this setting is enabled, real-time multimedia transcoding is deployed automatically as needed to enable media streaming, providing a seamless user experience even in extreme network conditions.

Use GPU for optimizing Windows Media multimedia redirection over WAN

This setting enables real-time multimedia transcoding to be done in the Graphics Processing Unit (GPU) on the Virtual Delivery Agent (VDA), to improve server scalability. GPU transcoding is available only if the VDA has a supported GPU for hardware acceleration. Otherwise, transcoding falls back to the CPU.

Note: GPU transcoding is supported only on NVIDIA GPUs.

By default, using the GPU on the VDA to optimize the delivery of Windows Media content over the WAN is prohibited.

When adding this setting to a policy, make sure the Windows Media Redirection and Optimization for Windows Media multimedia redirection over WAN settings are present and set to Allowed.

Windows media fallback prevention

Administrators can use the Windows media fallback prevention policy setting to specify the methods that will be attempted to deliver streamed content to users.

By default, this setting is not configured. When the setting is set to Not Confgured, the behavior is the same as Play all content.

To configure this setting, choose one of the following options:

  • Play all content. Attempt client-side content fetching, then Windows Media Redirection. If unsuccessful, play content on the server.
  • Play all content only on client. Attempt client-side fetching, then Windows Media Redirection. If unsuccessful, the content does not play.
  • Play only client-accessible content on client. Attempt only client-side fetching. If unsuccessful, the content does not play.

When the content does not play, the error message "Company has blocked video because of lack of resources" displays in the player window (for a default duration of 5 seconds).

The duration of this error message can be customized with the following registry key on the VDA. If the registry entry does not exist, the duration defaults to 5 seconds.

Windows Media client-side content fetching

This setting enables a user device to stream multimedia files directly from the source provider on the Internet or Intranet, rather than through the host server.

By default, the streaming of multimedia files to the user device direct from the source provider is allowed.

Allowing this setting improves network utilization and server scalability by moving any processing on the media from the host server to the user device. It also removes the requirement that an advanced multimedia framework such as Microsoft DirectShow or Media Foundation be installed on the user device; the user device requires only the ability to play a file from a URL

When adding this setting to a policy, make sure the Windows Media Redirection setting is present and set to Allowed. If this setting is disabled, the streaming of multimedia files to the user device direct from the source provider is also disabled.

Windows Media Redirection

This setting controls and optimizes the way servers deliver streaming audio and video to users.

By default, the delivery of streaming audio and video to users is allowed.

Allowing this setting increases the quality of audio and video rendered from the server to a level that compares with audio and video played locally on a user device. The server streams multimedia to the client in the original, compressed form and allows the user device to decompress and render the media.

Windows Media redirection optimizes multimedia files that are encoded with codecs that adhere to Microsoft DirectShow, DirectX Media Objects (DMO), and Media Foundation standards. To play back a given multimedia file, a codec compatible with the encoding format of the multimedia file must be present on the user device.

By default, audio is disabled on Citrix Receiver. To allow users to run multimedia applications in ICA sessions, turn on audio or give users permission to turn on audio in their Receiver interface.

Select Prohibited only if playing media using Windows Media redirection appears worse than when rendered using basic ICA compression and regular audio. This is rare but can happen under low bandwidth conditions, for example, with media with a very low frequency of key frames.

Windows Media Redirection buffer size

This setting specifies a buffer size from 1 to 10 seconds for multimedia acceleration.

By default, the buffer size is 5 seconds.

Windows Media Redirection buffer size use

This setting enables or disables using the buffer size specified in the Windows Media Redirection buffer size setting.

By default, the buffer size specified is not used.

If this setting is disabled or if the Windows Media Redirection buffer size setting is not configured, the server uses the default buffer size value (5 seconds).