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Configuring the Stream Relay
Some older receivers support PowerVu only through the Stream Relay (internal streaming). This setup needs a fast CPU though and not every STB is fast enough. If you cannot fix stuttering with the following guide, likely your CPU is too slow.

For best performance, the "Include ECM in http streams" setting must be enabled. If your image supports it (openpli, openatv), you can find it in OpenWebif -> Settings -> Customize. If this setting is not available, you may need to adjust the "ECM fix delay" setting in OSCam webIf (Config -> Stream Relay). Increase/Lower it until there is no stuttering.

Stream Relay config
Stream Relay is software descrambling through internal streaming. It can be used for watching PowerVu channels (on old receivers not supporting the extended cw), or for channels using other unconventional encryption systems like Compel or Rosscrypt1.

Enabling Stream Relay
To enable the Stream Relay you have to:

Select 1 - enabled in the Config -> Stream Relay -> Mode option.
Set the proper Caid for the channels you want to enable the Stream Relay for.
For PowerVu channels, caid is 0E00. Compel channels don't have an actual caid, so the OSCam-Emu's free-to-air FFFE caid is used. For Rosscrypt1 channels the caid is A101. Multiple caid values, separated with commas are accepted. For example, setting caid to 0E00,FFFE will enable the Stream Relay for PowerVu and Compel channels.

Creating a modified channel list
Stream Relay needs a modified channel list. First step is to get the streaming url for the channel you want to watch:

Go to the OpenWebif and click on the "Stream" button for the channel you want to add.
Download and save the .m3u file.
Open the .m3u file with a text editor and get the stream lin k. It looks like this: http://stb:8001/1:0:19:0123:3EF:1:C00000:0:0:0:
Replace the port (8001) with the relay port (default: 17999) and the host name ("stb") with 127.0.0.1. It should look like this: http://127.0.0.1:17999/1:0:19:0123:3EF:1:C00000:0:0:0:
After preparing the new stream lin k, you need to create a new channel in your user bouquet and add the url. For example, when using DreamBoxEdit, this can be done like this:

Go to the list in the middle "Bouquet details".
Right click and select "IPTV and other streaming services" and then select "Add".
Select "DVB/TS" as the service type.
Write a name for the channel and add the new stream lin k as URL you prepared above.
Set Service Type to "1" (SD) or "25" (HD) and enter the Service ID of the original channel. You can find it in the left list ("Services") or through the WebIf.
Do NOT use the correct Transponder ID/Network ID/Namespace for the stream lin k. Instead, use dummy values like Transponder ID: "11", Network ID: "22" and Namespace: "33".
Repeat these steps for every channel you want to watch via the Stream Relay.