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Citrix Receiver for Linux 12.1

About Citrix Receiver for Linux 12.1

The Tech. Preview release of Citrix Receiver for Linux includes several critical fixes related to Flash Redirection support and Windows Media redirection. More specifically, this version of the receiver supports flash redirection for thin clients on x86 and ARM based platforms and also includes support for Debian and openSUSE distributions in addition to Ubuntu and Fedora. It is worth noting that the flash player is not included in the binaries. Rather, vendors and customers are expected to provide an optimized version of the flash player for their specific platforms.

Windows Media redirection changes also includes several critical bug fixes and enhancement to provide to provide great user experience. More specifically it includes support for end-to-end flow control and frame dropping, improved support for audio and video codecs (including H.264) and configuration option for specific media types.

More specific details on the features in this release are included in the attached release notes including known issues that are expected to get fixed in the RTM build.

What’s New in Citrix Receiver for Linux 12.1 Beta

HDX MediaStream Flash Redirection

HDX MediaStream Flash Redirection has been enhanced to provide:

  • Support for both ARM and x86 32-bit thin clients.
  • Support for both Debian and openSUSE 32-bit distributions. Previously, support was available only for Ubuntu and Fedora 32-bit distributions.
  • Support for Internet Explorer 9.
    Note: Only 32-bit versions of Internet Explorer are supported server-side.
  • Fallback to server-side rendering when Flash is using either the Real Time Messaging Protocol (RTMP) or Real Time Media Flow Protocol (RTMFP). Note that server-side content fetching must be enabled to allow fallback to server-side rendering.
  • Keyboard and mouse handling both inside and outside of windows playing Flash content within a session.

HDX MediaStream Windows Media Redirection

HDX MediaStream Windows Media Redirection has been enhanced to provide:

  • Support for end-to-end flow control and frame dropping capability. This improves the user experience when the bandwidth available for viewing a Windows media video (WMV, MPEG, AVI, DivX, etc.) is less than what is required by the bit rate of the video, an issue increasingly experienced by customers as videos are recorded at higher resolution.
    Note: This feature is supported only when connecting to XenDesktop 5.5.
  • Improved support for existing audio and video codecs. Various enhancements improve the user experience, providing smoother playback of audio and video clips in the following formats:

    Audio: AC3, MPEG AAC, and AMR
    Video: WMV-VC1, Intel Indeo 5, MS CRAN, NV11, H.264, and H.263• Configurable text-based translation table. Receiver includes a configurable text-based translation table, MediaStreamingConfig.tbl, used for translating Windows-specific media format GUIDs into MIME types Gstreamer can use.

System Requirements

Device Requirements

  • At least 1GB RAM on the user device.
  • Ensure that Virtual Memory is enabled. This increases the virtual memory limit available for Flash to work with.

HDX MediaStream Flash Redirection Requirements

HDX MediaStream Flash Redirection requires:

  • libcurl 7.18.2 or later.
  • (Adobe Flash plug-in) version 10.0 or later. For ARM devices, the chip manufacturer should provide an optimized flash Plug-in implementation.

• Citrix recommends always upgrading to the latest version of the plug-in to obtain the latest functionality and security-related fixes.
• In addition to searching the standard locations for the shared library, Receiver also searches $ICAROOT. If multiple files are found in these locations, the file with the latest version (major/minor) is used.
• The major version of Flash Player installed on the user device must be equal to, or higher than, the major version of Flash Player installed for the version of Internet Explorer running on your XenApp or XenDesktop server.Upgrading from Previous Versions of Receiver for LinuxWhen upgrading from version 12.0, users must delete the Flash cache, typically located at ~/.ICAClient/CtxFlashCache before connecting to a session.

Configuring HDX Mediastream Flash Redirection

For more information about configuring HDX MediaStream Flash Redirection, see the Receiver for Linux and XenApp documentation in eDocs.


Download Citrix Receiver for Linux 12.1 here

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