Firstly, The Mediaportal project is opensource and needs everyone's help for testing and development. I've used MP for a couple of years now, since nearly the beginning. A couple of things you need to know about MP before you start is:
1. You need to install .Net Framework both 1.1 and 2.0). MP is a .Net program.
2. It is VMR9 only now. You need to have a DX9 capable card for it to run well (if you are viewing HDTV, I assume you have this covered. I use an nV 6600GT and Pentium 4 3.0E, so you don't need an UBER computer, but a 6600GT is the lowest card I recommend for HDTV and VMR9.
3. MP is hugely customizeable. The mediaplayer it uses will play ANYTHING so long as you have the right codecs and filters installed.
4. Installing a buttload of codecs (i.e. Codec packs) is the easiest way to bork your MP install. That being said I do install FFDshow for the 3IVX and older type codecs. But be sure you only select those codecs that you want to install. Don't install them all! For the purposes of this thread which is focused on the HDHR, I'm only going to talk about MPEG-2 Decoders. My personal favorite to watch ATSC programming is the nVidia Pure Video codec, but the gabest MPV codecs works well too (gabest decoders are included with Media Player Classic and are also opensource). The MPV Codecs are packaged with MP as are the Dscaler codecs.
So to get the HDHR to work with MP you need to download:
1..Net Framework 1.1 Link
2..Net framework 2.0 Link
3.Mediaportal version 0.2.2.2 Link
4.Mediaportal SVN version after 1/20/07 -Just use the latest Link
5.HDHR BDA driver LinkInstallation:
Install Mediaportal 0.2.2.2. Unzip the file and run the setup program. This should be pretty familiar to everyone by now. One key thing to install (id you don't have Mpeg-2 Decoders) is the MPV and Dscaler codecs. I recommend installing the MPV even if you plan to use something else as they are very stable and good to use for troubleshooting.
The SVN snapshots are addons to stable releases. It's best to install these over a clean install of Mediaportal. Which you just did above. Installation of the SVNs pretty straightforward. For more info on them here is a link to the SVN Wiki
You should be greeted with the following screen when you install an SVN:
Now it's time to install the HDHR BDA driver. Make sure you upgrade your HDHR to latest firmware which is super easy. Just download the latest firmware and use the GUI to update it.
Before Mediaportal will see the HDHR you need to register the .ax filter that is installed in your SiliconDust\\HDHomerun Directory. You can use the command line to register the .ax or if you have radlight filter manager installed, like me, you can just register it with Radlight.
Now that everything is installed, it's time to configure Mediaportal. There will be a Mediaportal Setup Icon on your desktop, or alternatively, you can go to Program Files\\Team Mediaportal\\MEdiaportal\\configuration.exe and launch it. Once you do this, the configuration screen wil pop up. Scroll down to Television, highlight Capture Cards, and press Add. You will see something similar to below.
Select the HDHR and click the Autotune and select Scan, as shown below.
This should find channels and add them. The entire scan should take ~10 minutes. Once your channels are added, you can verify that they are there by selecting the Channel List.
You are done with MP setup for now. Make sure you pres the OK button to apply the changes.
Now it's time to fire up Mediaportal, go to My TV and see what you get!