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<blockquote data-quote="iancalderban" data-source="post: 400610" data-attributes="member: 85629"><p>until someone does one properly. It does annoy me that the review sites all review gaming/3D performance and their only HTPC test is 1080p playback. 1080i BBCHD is actually harder. I went with the 780G on the strength of various reviews, but found it wanting in the end. Hey ho. the 4550 does the job admirably now.</p><p></p><p></p><p>I just couldn't get stable connection. Many times I would boot things up, ang get no audio. HDMI saying "no audio connected" despite picture working correctly. In the end, as I discovered my TV wouldn't pass through DD sound anyway, I gave up on it.</p><p></p><p>My next comments are on audio</p><p></p><p> I wasn't happy with analog connections, I could here hiss coming from somewhere. So I built myself an coax spdif connector quite easily. That got DD sound working and lost the hiss. But now there are two problems</p><p></p><p>- annoying loud high frequency click transmitted to the receiver, when the spdif output mode changes from stereo to DD or back again, depending on the audio codec of the source. As I am flicking between BBCHD (DD sound) and other channels (stereo sound) a lot, this is really annoying. This click is definately coming out of the pc.</p><p>- Audio volume control with my pc remote works for stereo channels, but it doesn't for DD channels. This causes negative WAF because of the confusion of "we can use the pc remote for BBC1 audio, but have to use the amp remote for BBCHD audio".</p><p></p><p>My solution (after much getting nowhere eventually finding an blog discussing use of this in windows 7 media centre) that gave me a clue on where to start. The key info is</p><p></p><p>- Use AC3filter as MP's audio codec</p><p>- Set AC3filter as 3/2.1 PCM output. DO NOT allow ac3filter to send anything to the SPDIF, disable all those passthrough type options.</p><p>- Set your realtek sound card to DTS 5.1 interactive output.</p><p>- obviously a DTS capable receiver is needed.</p><p></p><p>This has the effect that ac3filter decodes everything to PCM, it then passes through windows volume control (so your PC volume control works), the sound chip then re-encodes it to DTS 5.1. Which your amp then decodes as a 5.1 signal. So 5.1 audio is preserved, and volume control works (for everything) in the PC remote.</p><p>This also has the nice side-effect that WMV files with WMA-HD audio, can be sent to the receiver as DTS5.1, so you get 5.1 on those as well.</p><p></p><p>Really the only thing I'd like to be able to add to this setup from an audio point of view now is a plugin that give inside MP configuration of ac3filter's lip-sync value. I find I need about 50msec delay for my setup, and leave it set at that, but sometimes (programme dependent) I feel it needs tweaking to a bit more, but as it requires coming out of MP and going into AC3filter, thats clearly not WAF friendly whilst watching something.</p></blockquote><p></p>
[QUOTE="iancalderban, post: 400610, member: 85629"] until someone does one properly. It does annoy me that the review sites all review gaming/3D performance and their only HTPC test is 1080p playback. 1080i BBCHD is actually harder. I went with the 780G on the strength of various reviews, but found it wanting in the end. Hey ho. the 4550 does the job admirably now. I just couldn't get stable connection. Many times I would boot things up, ang get no audio. HDMI saying "no audio connected" despite picture working correctly. In the end, as I discovered my TV wouldn't pass through DD sound anyway, I gave up on it. My next comments are on audio I wasn't happy with analog connections, I could here hiss coming from somewhere. So I built myself an coax spdif connector quite easily. That got DD sound working and lost the hiss. But now there are two problems - annoying loud high frequency click transmitted to the receiver, when the spdif output mode changes from stereo to DD or back again, depending on the audio codec of the source. As I am flicking between BBCHD (DD sound) and other channels (stereo sound) a lot, this is really annoying. This click is definately coming out of the pc. - Audio volume control with my pc remote works for stereo channels, but it doesn't for DD channels. This causes negative WAF because of the confusion of "we can use the pc remote for BBC1 audio, but have to use the amp remote for BBCHD audio". My solution (after much getting nowhere eventually finding an blog discussing use of this in windows 7 media centre) that gave me a clue on where to start. The key info is - Use AC3filter as MP's audio codec - Set AC3filter as 3/2.1 PCM output. DO NOT allow ac3filter to send anything to the SPDIF, disable all those passthrough type options. - Set your realtek sound card to DTS 5.1 interactive output. - obviously a DTS capable receiver is needed. This has the effect that ac3filter decodes everything to PCM, it then passes through windows volume control (so your PC volume control works), the sound chip then re-encodes it to DTS 5.1. Which your amp then decodes as a 5.1 signal. So 5.1 audio is preserved, and volume control works (for everything) in the PC remote. This also has the nice side-effect that WMV files with WMA-HD audio, can be sent to the receiver as DTS5.1, so you get 5.1 on those as well. Really the only thing I'd like to be able to add to this setup from an audio point of view now is a plugin that give inside MP configuration of ac3filter's lip-sync value. I find I need about 50msec delay for my setup, and leave it set at that, but sometimes (programme dependent) I feel it needs tweaking to a bit more, but as it requires coming out of MP and going into AC3filter, thats clearly not WAF friendly whilst watching something. [/QUOTE]
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