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Nice, real time ac3 encoding. Time to test it out.


Edit: Heh, seems to work. But it cuts out after a few seconds. Probably because my cpu can't handle it. Guess a 2ghz Athlon XP doesn't cut it. It was relatively simple to get working. I just added AC3filter after my audio decoder, i.e. 'mpeg layer-3 decoder' then 'ac3filter' for mpeg layer-3 decoder in customized media playback in zp. Maybe I'm doing something wrong. Back to testing.


Edit2: It seems I completely lost AC3 passthrough with AC3filter. AC3filter only wants do decode it now. It won't pass it directly to my reciever.
 

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Did you check the boxes in config for pass-through?


What sorts of uses are there for encoding to ac3 5.1?
 

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Yup, I checked the passthrough boxes. Still didn't work.


Real time ac3 encoding would be good for the wma9 5.1 in wmvhd movies. And it's the first public release of a 'working' ac3 encoder. Someone could develop it into a way to make 5.1 games output via spdif. Making a 1 audio cable htpc/gaming system (w/bit-perfect audio) truely possible.
 

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Igthorn-


I doesn't take a super processor, i just got it working on a 700Mhz Athlon T-bird. I actually got it working in both WMP9 and zoom, but i haven't checked if it has messed up TheaterTek. HOWEVER, I have been able to repoduce your loss of encoding on a few mpeg/avi files. BUT, on other files it has no problems and happily real-time encodes the entire file. It must have to do with some poorly encoded files....will check it out more, since my new Shuttle PC (AMD Athlon64 3000+ w/nForce3 150) is on the way to play those wonderful HD WMV9 files and i want a DIGITAL connection to the pre/pro.


The Settings are as follows:

Main Page:

Output: 3/2+SW @ PCM32 w/ SPDIF disabled


Mixer Page:

No changes from default and what is autoconfigured from the main page


Gain Page:

Again No changes to gain levels


System Page:

AC3 Filter FOR: PCM, MPEG, & MPEG 1/2

SPDIF passthrough FOR; DTS, AC3

Wave Output for default renderer


My pre/pro indicates that its encoding DD5.1 as its connected via digital coax from my REVO. ReClock doesn't seem to be causing any problems either.



-Dave
 

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Quote:
Originally posted by Igthorn
Yup, I checked the passthrough boxes. Still didn't work.
Same here. What should "SPDIF (disabled)" be set to? It seems to have no effect either way, though. I reverted back to v0.70b and passthrough works fine. I'm using Win2K pro SP4.
 

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I would test it out but I don't have winxp, so no wma9 5.1 for me. But it should be possible if you can put ac3filter after the wma decoder. I tested out Robotica (720p) anyway, since ac3filter can matrix 2ch to 5.1. It didn't work too well. I doubt my cpu can handle both decoding wmvhd and trying to encode to ac3. I did sorta get it to work, but it slows to a crawl and it cuts out.
 

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Is it possible to somehow use this filter in dscaler? I would like to realtime encode a satellite stb 2 channel audio stream to either PLII or DD?


Thanks,


Steve
 

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This is early code... I strongly suggest you post on the doom9 forum explaining exactly what doesn't work, with which hardware on what OS and with which content.


It's nice to see this project is moving forward.
 

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I think my slowing to a crawl was caused by elecard mpeg decoders, even though they are not in use. I uninstalled it and now it doesn't slow to a crawl or freeze. But the audio still occasionally stops working. When it does work it seems to work pretty well. Cpu utilization isn't too high. Some audio just doesn't want to be encoded to ac3. AC3 passthrough still doesn't work.


Trying with 2ch matrix to 5.1 with the robotica 720p trailer, it only encodes when matrixed to 5.1. 2ch stereo doesn't encode. And it eventually freezes, but I can close zp with no problems (no need to ctrl-alt-del, and force a zp to close). The movie just seems to stop.


I'll post to the doom9 when my 5day waiting period is up.
 

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It's good to see this sort of thing coming available.


I have nForce2 / Soundstorm so don't really need it since hardware encoding is part of the package.


Irregardless of software or hardware encoding, some degradation of sound will occur due to multiple lossy compressions by different codecs.


Hopefully, WMV9 content providers will put defacto audio on DVD's along with WMA so that everyone can use what they will.


DFA
 

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btw is there a cvs checkout for the new sourcecode somewhere?
 

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I'm not currently using the new AC3 encode feature, but this version is also able to software decode DTS 5.1 for use with my M-Audio 410 sound card. That seems to work great. Not sure when it was added, but it was not there in the version of ac3filter I previously had installed. No need to purchase the add-on audio decoder pack for Win-Dvd to get DTS software decode. Nice.


Joe L.

P.S.

My wife said that I spooked the dog with repeated cannon fire. (Master and Commander, about 12 minutes into the film... Yes, it was at reference level, and the dog was upstairs... :):) and cannon are supposed to be loud!)
 

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joe: would you sharing your setup? sounds like you are using analog out from your 410 for dts (and presumably ac3)... did you use the new ac3 filter with zoom player? also, are you decoding any external video audio sources with your htpc and sending it out via your 410?
 

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WT-46809,


Yes, I am using analog out from my 410 for dts and ac3 with the new ac3 filter with zoom player.


I made three changes from the default configuration as initially installed.


On the main page I selected Output: 3/2+SW and 32K bit rate


On the mixer page I unchecked the bass management checkbox since the 410 card did that task with a lot more flexibility.


I am not decoding any external video audio sources. I have a H/K receiver that does hardware decode when fed with the HDTV Cable box. I'm using analog input on it with 7.1 channel audio from the HTPC sound-card for DVD playback.


Joe L.
 

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joe: thanks for your quick response. i will also be using the analog outs of my card into my amp but will also be processing external video audio sources with my htpc. what are your thoughts regarding the sound quality of the ac3 filter dts decoding plus your 410 versus hardware dts decoding (assuming your hk does this)?
 

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Me to i can't get spdif passthrough.

Although i've checked the spdif checkboxes i don't get a spdif option at the output list box
 

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It works for WMVHD on a SoundMax integrated chipset, finally 5.1 on spdif for WMVHD, very very nice. Also for me it lasts only 30 seconds, i can't wait to see T2 and all the trailers in 5.1 sound. Let's hope this is fixable.


bye
 
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