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Help.... Totally lost on my TrueHD bitstreaming / Encoded Formats list.

post #1 of 16
Thread Starter 
Hi all...

The problem in a nuttshell: I can't get TrueHD bitstreaming working. FFdshow will pick up the stream as TrueHD, but keeps making the output PCM 5.1 48khz / 32-bit integer.

First, my setup:

APU: AMD A8 3850 / 2.9 GHz - Socket FM1 - L2 4 MB - Box
Mobo: Gigabyte GA-A75M-UD2H (rev. 1.0)
Receiver: Samsung HTD6500

As you can see, all of these components must be well-capable of playing TrueHD content.

I've connected my HTPC to my receiver with an HDMI cable.

Now, for the problem:

I can play back 5.1 sound, no problem. It plays DTS like a charm, i have absolutely no problems with playback whatsoever, except for this:



I can't get it to bitstream in TrueHD.

First, i thought it was the settings in FFdShow, and MPC-HC. I've checked all guides, settings, etc. Even had a collegue take a look at it, who has this working at home;

All settings in FFDshow and MPC-HC should be fine.
I can post em if people are interested.


Then, i noticed something:
When i open the audio output device (The AMD HDMI Output) and i check supported formats -> Encoded Formats list, i see only the following 2 codecs:



Also, the samplefrequency is 96.0 khz max.

What the f? Shouldn't this be up to 192 khz, and at least look something similair to this:



I've tried different drivers, both from AMD, Realtek, ATI, etc, but to no avail.

My 2 questions are:

1. Could this be the reason that i can't get bitstreaming to work (that it is making the output PCM 5.1, no matter what i try)?

2. Where is the problem residing here? The mobo should be well-capable of playing TrueHD formats, and my receiver is capable of decoding it.


I'm totally lost here. Where should i turn to get my encoded formats list like the one in the last picture? Is it a driver? If so, is it AMD / ATI / Realtek? Or is it hardware related? Etc.

I'm totally lost here, so if any1 have seen this problem before, or God willingly knows the answer to this, i'd be forever grateful.

Thanks in advance,
Kami.
post #2 of 16
I'm running into this myself, turns out very few and I mean very few card's actually support Bitstreaming HD Audio format's, most will convert to PCM and send it that way, I ended up having to order a HD6450 to get bitstreaming.
post #3 of 16
From the Gigabyte website in regards to your motherboard......

Quote:
As the HD multimedia revolution continues to gain momentum, so too must hardware standards in audio quality. All GIGABYTE Super4™ motherboards offer excellent 7.1 surround sound audio backed by a proprietary converter that is able to achieve 108dB noise ratio (SNR) playback quality. This means that users will enjoy a better audio experience with lower levels of noise and hiss when enjoying the latest HD content.
Notice the use of the word "converter" this tell's me that most likely the board doe's not support protected path bitstreaming hence you'll only get converted PCM or have to use the analog outs for 7.1 audio.
post #4 of 16
And lastly to be honest you're not going to notice any difference on a little HTIB system.
post #5 of 16
Thread Starter 
Ye, but thats regarding to 7.1 sound. Besides, this is one of the newest mobo's they released, specially made for the new FM1 APU's. I cannot imagine that it means it is not capable of playing TrueHD.

Besides, it has the HD6550 onboard, so if u have ordered an HD6450 for bitstreaming, surely the 6550 will support it?
post #6 of 16
Umm I don't see what the problem is. Dolby True HD is a lossless codec. PCM is a lossless codec. IIRC, TrueHD picks whatever transport is supported by your hardware-i.e. if you're using HDMI 1.3+ all around it'll stay TrueHD, otherwise it'll be linear PCM. Either you don't lose much. As said they're both lossless.
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post #7 of 16
Quote:
Originally Posted by KrazeyKami View Post
Ye, but thats regarding to 7.1 sound. Besides, this is one of the newest mobo's they released, specially made for the new FM1 APU's. I cannot imagine that it means it is not capable of playing TrueHD.

Besides, it has the HD6550 onboard, so if u have ordered an HD6450 for bitstreaming, surely the 6550 will support it?
However the MB manufacturer can change the feature set to suit their price point/need's, good example, my board which is a 780g board will only send 2 channel stereo PCM of Dolby True, Or DTS MA audio over HDMI, even though the chipset will support 8 channel they limit it to stereo and even if it wasn't limited it stilld doesn't support protected bitstream passthrough yet is HDMI 1.3a Compliant.

Reading the statement that I posted it appears you're in the same boat. Also it's going to report 5.1 no matter what since your HTIB is only 5.1 so it will convert 7.1 to 5.1 PCM and then pass the decoded PCM over the HDMI to your system.
post #8 of 16
Thread Starter 
Quote:
Originally Posted by Skripka View Post
Umm I don't see what the problem is. Dolby True HD is a lossless codec. PCM is a lossless codec. IIRC, TrueHD picks whatever transport is supported by your hardware-i.e. if you're using HDMI 1.3+ all around it'll stay TrueHD, otherwise it'll be linear PCM. Either you don't lose much. As said they're both lossless.
True But the bottom line: i want that TrueHD led lighting up on my receiver. Im pretty sure it should be capable of bitstreaming it, so im wondering what else could be the problem.

JeremyFr makes a good point, but im not convinced that this brand new mobo + APU, made especially for HTPC systems is not capable of bitstreaming TrueHD.

Thanks for the replies anyway, both of you.
post #9 of 16
LAV > FFDSHOW. I had tons of issues with FFDSHOW, ever since switching to lav it has been flawless.
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post #10 of 16
Thread Starter 
Hey Hick,

Thx 4 the reply.

When using LAV, i can also play the sound etc, but i cannot really check if it's bitstreaming TrueHD; to be honest, my receiver doesn't have the fancy light that i want It only became clear to me when i saw FFdshow's popup that it was outputting the signal als PCM 5.1. Since LAV doesn't have a system tray icon when playing, i cannot really test if it is TrueHD untouched, or PCM that it's producing.

Plus the fact, that im still a bit confused on this:



Every1 has TrueHD etc enlisted as a codec, wether they manage to bitstream or not.
Im really starting to doubt my receiver at this point.
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