AC3Filter prerelease version (ac3/dts/lpcm support)

[neo75903]

idd, all seems to work fine except from sending a AC3 signal to my amp.
The result is a cracky noisy sound which i presume the ac3 encoding part is not right yet.
I have a Sony STR DB1070 amp, which is an excellent AC3 decoder, and that Multi Chan led is so kewl when it is lid on

btw nice peace of software!

Regards Neo75903

[neo75903]

i mean AC3 signal encoded from my 5.1aac source.
AC3 source works perfect.
Is it true that AC3 filter is going to support 5.1aac?

pls say yes

PS testing DVD playback soon.

[Valex]

@neo75903
>Is it true that AC3 filter is going to support 5.1aac?

Yes, but later. Noew I want to make at least first release of new version...

>PS testing DVD playback soon.
If you have mixed formats DVDs please try what yevaman wrote about... (switch between formats in SPDIF output mode)

[yevaman]

What about my problems Valex ? did u find something ?

If u need real time test we can meet on irc if u want..

[HarryM]

Valex:

Milan works intensively on a audio part of "ffdshow", which is similar to your second-generation AC3filter project (multiformat audio decoder).

Can you colaborate on this?

[Blight]

Valex:
There seems to be some sort of timing issue with DTS decoding, here are the details:

1. DTS VOB file from http://www.cinenow.com/us/vobtrailer.php3/id,19/
2. Open Source MPEG Splitter http://inmatrix.osnn.net/osmpegsplitter29032004_nt.exe
3. Open Source MPEG2 Video Decoder http://www.inmatrix.com/download/osm...9032004_nt.exe

Graph is:

File Source Async -> Splitter -> Video Decoder -> Overlay Mixer -> Video Renderer
________________________ -> AC3 Filter -> Default DirectShow Device

I've experimented with this in GraphEdit with the AC3 Filter at it's default setting (Audio decoded to 2.0 stereo, no S/PDIF).

What happens is that the VOB is played in slow-motion. When trying to use the OpenSource Audio Decoder, it plays the clip smoothly.

[Frisco]

Thanx Valex for the great codec

My Setup is :

Main\Output
- Dolby ProLogic II
- PCM 16 bit
- "True" in SPDIF

System\Use AC3Filter for..
- "True" in AC3

System\SPDIF
- "True" in AC3

This, SPDIF passthrougt, work in RC2, but not in RC4.

(Input sound is AC3 - 48000Hz)

Hi Frisco

[hippoth]

Problems with RC4:

I don´t get S/PDIF passthrough (5.1 AC3 48 KHz), when I disable "SPDIF (disable)" in the main-register despite it is enabled in the system-register (I have all options enabled there)...I mean I don´t have any AC3 5.1 sound with this options but I can hear 2.0 AC3 (your maria.ac3 test file) and stereo sound files

...and in the contrary I can´t play normal stereo and 2.0 AC3 (your maria.ac3 test file) files when I enable "SPDIF (disable)" in the main-register but get S/PDIF passthrough for 5.1

for understanding:

what do I have to set in the main-register, in the output?
what quantisation I have to choose for the PCM...16, 24, 32 or float?

and a last understanding question: when I enable the "SPDIF (disable)"-switch in the main-register your filter tries to encode the stereo to an AC3 singnal or?


I hope it´s not to confusing

[neo75903]

DVD playback trials.
- DVD playback with SPDIF did not work. Tried it with several DVDs.
Movie hangs at the very first second, Analogue playback is ok.

- Locally saved saved VOBS (no menu, main movie only) do play correctly through SPDIF with a few ticks or interruption here and while which does not occur when i passthrough the signal. Analogue is also ok.

Guess AC3 encoding need some more work.

MPC 6.4.8.2, all filters switched off.

Well so far my evening, good nite lads

[Rash]

Just a question. The Bass Redirection is the one that mixes the LFE channel on the other outputs, for those 4.0 with filtered sub-woofer like me?

Thanks a lot Valex, once again.

[yevaman]

"DVD playback trials.
- DVD playback with SPDIF did not work. Tried it with several DVDs.
Movie hangs at the very first second, Analogue playback is ok."

Same problems there , analog is ok but as soon as it switch to 5.1 or dts --> freeze

Divx+ ac3 ok anyway
Dts sample too

Divx + 2 way stereo -> crappy sound


All with SPDIF output

[basje]

Originally posted by yevaman
"DVD playback trials.
- DVD playback with SPDIF did not work. Tried it with several DVDs.
Movie hangs at the very first second, Analogue playback is ok."

Same problems there , analog is ok but as soon as it switch to 5.1 or dts --> freeze

Divx+ ac3 ok anyway
Dts sample too

Divx + 2 way stereo -> crappy sound


All with SPDIF output

I have the exact same problem with DVD playback. I get 100% CPU use. Analog is fine.

Groeten,

Bas

[Mitchjs]

Valex,

RC4 is definitly broken on DTS

when it sees my .dts file i see the stream input section going crazy
it never passes, and i get silence

going back to RC2 works

keep up the good work... anything to help

if ya can squeeze in me the disable all AC3 encode, then
i can use this filter for mpg and pcm (i want the NForce HW to do the encode)

mitch

[Firewave]

I got a problem with the "Output". I set it to "2/0+SW 2.1 stereo" in the OFFLINE configuration. When I start a movie and got into the configuration of the AC3Filter it shows "3/0 - 3 front". And when I go into the OFFLINE configuration after that it's also set to "3/0 - 3 front".
Using the 1.01a RC4.

[dimzon]

Originally posted by HarryM
Valex:

Milan works intensively on a audio part of "ffdshow", which is similar to your second-generation AC3filter project (multiformat audio decoder).

Can you colaborate on this?

Yeah, I think it's good idea!

[Gibalou]

I've been looking for the source code of this pre-release version and couldn't find it.

Anybody knows where it is available ?

[oddball]

Just to confirm that AC3 passthru does not work over SPDIF in RC4 (It just sends PCM not matter what).

[Valex]

@Blight

Everything is too sad...

First. The OpenSource MPEG2 Splitter has a bug. It detects 22050Hz DTS where it is 48000Hz... I follow timestamps come from upstream (otherwise desync is possible in some cases) what leads to slow audio playback...

Second. Standard MPEG2 Splitter (and MPEG2 Demultiplexer) does not understand .vob with only one dts track.

Third. Media Player Classics has the same problem with sample rate detection when switching from ac3 to dts track. In case of only one dts track player decodes it by itself regardless of the fact that decoder is turned off in options.

[Valex]

@All
http://ac3filter.sourceforge.net/dow..._1_01a_rc5.exe
SPDIF passthrough is back...

[Valex]

@Rash
>Just a question. The Bass Redirection is the one that mixes the LFE channel on the other outputs, for those 4.0 with filtered sub-woofer like me?

No. Bass redirection routes basses from all channes to subwoofer (if exists at output). So it is not required for you (it just does not work in your case).