IIS 7 and Above
Microsoft Smooth Streaming Plugin with OVP and OSMF
Last post Apr 08, 2014 09:33 PM by larocque
Apr 02, 2014 12:00 PM|larocque|LINK
I have used Live Microsoft Smooth Streaming through Silverlight for
years, and have never got to the bottom of an issue. Historically
Silverlight has had problems with GPU acceleration, causing horizontal
tearing and motion stutter on various platforms (search Netflix and
“tearing” and you will see). This seemed to be fixed by a parameter you
can pass to the Smooth XAP in your HTML initialization, called
"enableGPUAcceleration". The problem is, I can only set this parameter
in a basic Silverlight player built from an Expression Encoder Template.
If you use Open Video Player Silverlight edition, there is no
possibility to enable this parameter. I have consistently had the bad
playback in OVP on any device, any browser, any OS. When I heard
Microsoft had released Smooth Streaming Plugin for playback in Flash
environment (OSMF) I was excited to try it out, and see if I could get
better playback. Unfortunately I have found OSMF has identical symptoms
to OVP Silverlight. I enable/disable Stage video in OSMF, or GPU
acceleration in Flash, no difference. It seems the only way the Smooth
Streaming plugin works right is if it is used in the basic Expression
Encoder template. Or, maybe I am missing a way to pass “enableGPU”
directly to the Silverlight plugin in OSMF/OVP? Do you have success with
the Smooth plugin in other players?
Note: I found also if you build a Windows 8 App test player using the Microsoft walkthrough, the Smooth Stream performance is perfect. I need to find out how to make Smooth work perfect in 3rd party browser players.
Apr 04, 2014 03:58 AM|Jenny Li-MSFT|LINK
You'e better give comment on the OVP's official website like
http://openvideoplayer.sourceforge.net/ , and feedback of Smooth Streaming plugin for OSMF on
have your tried MMP Player enableGPUAcceleration can be set in the html file check
Apr 08, 2014 09:33 PM|larocque|LINK
Thank you for your advice. To share with you all, the solution for OSMF was this: Microsoft Expression Silverlight templates are using “enableGPUacceleration” as a proxy to enable CacheMode=BitmapCache on the MediaElement it creates internally. I was able
to successfully set CacheMode=BitmapCache in Strobe Player, by initializing the Smooth Streaming plugin as follows: param name=”flashvars” value=”src=MyStream&plugin_AdaptiveStreamingPlugin=AdaptiveStreamingPluginLocation&AdaptiveStreamingPlugin_CacheMode=BitmapCache.
All the tearing and stutter is fixed, and Strobe player plays as smoothly as Expression templates. OVP I have not been successful with yet. MMP does not have the capabilities I need.