We will now devote a couple of sections to open source / freeware software for HTPCs running Windows 7.

One of the main issues with the integrated GPUs in the Clarkdale/Arrandale and Sandy Bridge CPUs is the fact that the Intel HD Graphics engine doesn't play nice with open source software. Commercial Blu-ray playback software have woeful support for MKVs and HD audio bitstreaming from non-Blu-ray sources. Users of the Intel IGP are often left to implement a series of hacks (such as using the Arcsoft and Cyberlink decoders in other DirectShow players) to get the expected HTPC experience.

Windows 7 uses the DirectShow / Media Foundation framework for media processing. A detailed description of the framework is beyond the scope of this piece. However, what we need to specifically be aware of is the architecture of the DirectShow framework, as described here.

The two important components of the filter chain in the above link are the splitter and the decoder. MPC-HC is undoubtedly the most common DirectShow based media player used to playback HD material. The player aims to make the task of the filter construction transparent to the user by packaging a variety of source filters for various containers. These include the Gabest MPEG Splitter, internal Matroska Splitter (I remember preferring the Haali Matroska Splitter from the CCCP codec pack in late 2009), MP4 Splitter, OGG Splitter etc. A look at the standalone filters reveals the large number of standalone source filters / splitters which are in the self-contained executable.

It is preferable to have a single actively developed multi-format splitter capable of handling a wide variety of containers with a multitude of audio and video codecs / subtitle formats. This is where the LAV Splitter project comes in. Basic supported for decrypted Blu-rays (playback of MPLS / index.bdmv files) is the icing on the cake.

With HD audio capable AV receivers becoming the rule rather than the exception, one increasingly finds users interested in HD audio bitstreaming. MediaSmartServer's Damian has a great guide dealing with the usage of ffdshow for HD audio bitstreaming. Advanced users often consider ffdshow Audio as bloatware for those who just want HD audio bitstreaming. LAV Splitter comes with the optional LAV Audio Decoder which achieves the same purpose. For users who want HD audio to be decoded in a bit-perfect manner, the LAV Splitter can also connect to the Arcsoft Audio Decoder as explained here. In this section, we will deal only with HD audio bitstreaming.

The gallery below shows the sequence of steps to install LAV Splitter and Audio Decoder on a Windows 7 machine for usage with MPC-HC. You can also use any other DirectShow based player. The LAV Audio Decoder is then configured to bitstream all the HD audio formats.

Ensure that all the file formats chosen in screenshot 5 are unselected in screenshot 8 (MPC-HC options -> Internal Filters -> Source Filter). Also, the Transform Filters for AC3 and DTS must be unselected to ensure that the LAV Audio Decoder is used. Screenshots 9 through 12 show the setting up of the LAV Audio Decoder for bitstreaming in the External Filters section using the 'Add Filter' button. Screenshots 13 through 16 show the setting up of the LAV Splitter in a similar manner. Fortunately, the default settings in the splitter configuration are good to go unless you have some specific requirements with respect to the language code or don't want the LAV Splitter to activate for some specific extensions. Make sure that both the LAV Splitter and the LAV Audio Decoder are set to 'Prefer' in the External Filters section.

Playing back interlaced VC-1 clips with the default codecs in MPC-HC usually results in a blank screen. To resolve this, the Arcsoft Video Decoder needs to be registered and used. (The WMV Decoder DMO codec is able to play back such clips, but it does software decode). After installing Arcsoft TMT (TMT 5 was used to test this out), the Arcsoft Video Decoder (ASVid.ax) was manually registered using the regsvr32 command in Administrator mode. This exposes the decoder for inclusion in the External Filters section in MPC-HC, as in the first picture of the gallery below. However, setting the decoder to Preferred doesn't enable its usage unless the checkactivate.dll from this doom9 post gets placed in the same folder as ASVid.ax. After this process, an interlaced VC-1 clip can be loaded into MPC-HC. In the default configuration, you will still end up with a blank screen. The VC-1 output compatibility of the LAV Splitter needs to be configured to reflect the presence of the Arcsoft VC-1 decoder, as in the rest of the screenshots in the gallery below. Note that this configuration is necessary only for AMD (and Intel) GPUs. NVIDIA GPUs have a open source decoder capable of playing back interlaced VC-1 clips in any DirectShow based player. We will cover that in the next section.

Once configured, you should be able to see the filters in action during the playback of any media file in the appropriate container.

Playing The DaVinci Code's BR Folder Structure - index.bdmv

(Click to Enlarge)

We have never seen the ffdshow Audio decoder successfully bitstream E-AC3 (Dolby Digital Plus). With the LAV Audio Decoder, there were no such issues.

Dolby Digital + Lights Up on the Onkyo 606

The ease of use of the LAV Audio Decoder, its tight integration with LAV Splitter and the ability to use the Arcsoft HD audio decoder for DTS-HD / DTS-ES streams (for which no open source decoders exist) make it a very attractive option for HTPC users.

GT 430 Bitrate Limitations and the GT 520 VDPAU Feature Set D Software for NVIDIA HTPCs : LAV CUVID and madVR
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  • fixxxer0 - Sunday, June 12, 2011 - link

    that arrangement of cards slightly resembles a swastika Reply
  • Anand Lal Shimpi - Sunday, June 12, 2011 - link

    Thanks for the heads up, it honestly didn't cross our minds at all but now that it's been pointed out I can completely see the resemblance. Needless to say we've removed the offending image and I'd like to apologize to anyone who was offended.

    Thank you guys for catching it so quickly.

    Take care,
    Anand
    Reply
  • fb39ca4 - Monday, June 13, 2011 - link

    If people want to jump to conclusions, let them. The swastika means many things, if you want to associate it with Nazis then go ahead, or you could associate it with the religion Jainsim, which it happens to be a symbol of. Your interpretaion of the image affects no one, there is no reason to make a big deal over it. Reply
  • fixxxer0 - Monday, June 13, 2011 - link

    lol... i made no connection to nazis or anything... nor said i was offended.

    i just pointed out a resemblance i noticed as a matter of fact.
    Reply
  • tzhu07 - Sunday, June 12, 2011 - link

    Yeah, time to change the Nazi reference. Reply
  • qwertymac93 - Sunday, June 12, 2011 - link

    The indians(the asian ones...) have been using Swastikas for centuries before the nazi party was even thought of. Just sayin'. Reply
  • jwilliams4200 - Sunday, June 12, 2011 - link

    It is unfortunate that there is such an over-reaction to something like this. Besides, the swastika symbol is and has been used for many, many other purposes than representing Nazis:

    http://en.wikipedia.org/wiki/Swastika
    Reply
  • Souka - Monday, June 13, 2011 - link

    True as it may be that fact remains that if some one says:

    "Hitler"
    Most people think of Adolf

    "swastika"
    Most people think of Nazi

    I'm of Jewish decent... the pic didn't offend me in the least bit, nor my friends.

    Jusy saying.... ;)
    Reply
  • Gnarr - Monday, June 13, 2011 - link

    people should be thinking of Nazi's and Hitler anyways, it reminds everyone not to make that mistake again.

    I see no harm in accidentally arranging something in a Swastika :p

    and on that notes.. There is a company in my home country that has been using the swastika as the company logo for over hundred years:
    http://martasmarta.blog.is/users/1d/martasmarta/im... ;)
    Reply
  • L. - Tuesday, June 14, 2011 - link

    Unfortunately it does not.

    The way the western world depicts adolf hitler, nazism and everything surrounding that part of history is far from reminding anyone not to make that mistake again, as the main message is "nazi evil, hitler evil, us good guys, us not like them".

    Anyone ever wondered what difference there is between Gestapo and the Patriot Act ? - oh right it doesn't target jews so it's fine ... lol
    Reply

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