How to optimize the connections and user experience of cloud computers-Elastic Desktop Service-阿里云帮助中心

Policies in Elastic Desktop Service (EDS) are used to control user experience, security, audit, peripherals, remote collaboration, and AI. This topic describes the policies used to control user experience.

Display

The display configurations determine the quality of the graphics of cloud computers.

Display configurations

Configuration item	Description
Display Mode	The display mode in which a cloud computer runs. Valid values: Manual If you select this mode, you also need to set Image Quality. End users can change the display mode on EDS clients on demand. For more information, see Graphic preferences. Daily Office Scenario This mode is suitable for writing documents or watching videos in daily office scenarios. The intelligent mode is automatically selected and cannot be changed. Design and 3D Application Scenario This mode is suitable for design software and 3D applications with dynamic visuals. The best performance mode is automatically selected and cannot be changed. Custom This mode allows you to customize the graphics quality parameters, such as applicable scenarios, color enhancement, and smoothness enhancement.
Image Quality Control	Enable this feature to enhance the quality of graphics for cloud computers. If you use a graphics cloud computer for design purposes, we recommend that you enable this feature to improve the performance and user experience of your cloud computer. Note This feature applies only to HDX-based cloud computers accelerated by GPUs.
Resolution Settings	Controls the display resolution settings for cloud computers. Options include: Adaptive The cloud computer resolution automatically adjusts to fit the terminal screen. Fixed The resolution is set to the fixed value that you specify and does not adapt to the terminal screen. The DPI is locked at 100. Note that some applications may still alter this setting. Note The default Fixed Resolution is 1920×1080px, with a minimum value of 640×480px and a maximum of 4096×2160px allowed. Both the width and height values must be even numbers.

Connections

The connection configurations determine the user experience of cloud computers.

Scenario

Configuration item	Cloud computer protocol	Minimum image version	Client type and minimum version
Network Transmission (UDP and TCP)	ASP	V1.0.0	Any client of V5.2.0
Network Transmission (AUTO and AST)	ASP	V1.5.0	Any client of V6.5.0

Connection configurations

Configuration item

Description

Network Transmission

The network transmission mode. Valid values:

AUTO: automatically switches between the AST and UDP modes based on the content displayed on cloud computers.
User Datagram Protocol (UDP): suitable for office and HD graphics design scenarios and delivers high resolution.
Adaptive Streaming Transport (AST): suitable for high-frequency audio and video playback scenarios and can deliver smooth user experience.
Transmission Control Protocol (TCP): suitable for scenarios where UDP and AST are limited and can provide a high connection success rate.

Note

By default, the UDP mode is enabled. If UDP ports in the network of cloud computers are blocked by network policies or have triggered rate limiting, select the TCP mode.
If the AUTO or AST mode is selected but the cloud computers do not meet the connection requirements, the client automatically switches to the TCP mode.

Max. Retry Period

The maximum period of time during which the system attempts to reconnect to a cloud computer when an end user fails to connect to the cloud computer. Valid values: 30 to 7200. Unit: seconds.

Media Redirection

Media redirection redirects multimedia content to local devices of end users in order to play video or audio content on local devices. This can efficiently improve the smoothness of multimedia playback.

Use scenarios

Video and audio processing is computing-intensive operations, which require high-performance computers. Media redirection has the following benefits:

Media redirection redirects multimedia to local devices of end users to reduce the cloud resource consumption of cloud computers by up to 80%.
Media redirection supports various media formats and is suitable for multiple use scenarios of cloud computers.
Media redirection uses the VLC media player pre-installed on cloud computers to play videos in HD (2K or higher). This way, video and audio content can be played on low-specification cloud computers in lossless HD.
Media redirection addresses the latency issue that occurs when video or audio content is played on cloud computers, and ensures a smooth multimedia experience for end users.

Limits

Limit	Description
Client	Only Windows client and macOS client of V6.1.0 and later are supported.
Cloud computer OS image	Only Windows OS images for Adaptive Streaming Protocol (ASP) are supported. Linux OS images are not supported.
Video resolution	TCP: plays mainstream video or audio content with a resolution of 4K or lower. UDP: plays mainstream video or audio content with a resolution of 2K or lower.
Player	Only the VLC media player is supported. Note The VLC media player pre-installed on cloud computers does not support video or audio effects.
Video and audio formats	The VLC media player supports the following video and audio formats: MP4, AVI, AAC, OPUS, and MP3.
Full-screen or multi-display mode	The full-screen mode is not supported. You can only zoom, stretch, or drag the screen. Only the single-display mode is supported. If you use two displays, you cannot use the VLC media player to play videos on the secondary display.
End user scenarios	When end users use cloud computers to share screens for remote assistance or other purposes, the participants cannot view the video or audio content played by using media redirection.

Media redirection configurations

Configuration item	Description
Media Redirection	Enable or disable the media redirection feature.

Policies for user experience