AC3Filter prerelease version (ac3/dts/lpcm support)

[yidaki]

I love AC3filter, it's like the FFDshow of surround sound

[Nippur]

Thank you!!!! I will try it! Waiting for the final version!!!

[athos]

Originally posted by Valex
But note that encoding may not be possible because some sound cards cannot transmit 44100Hz encoded audio, so if you have such source it will be encoded.

Perhaps you could include a sample rate conversion function in future versions, based on SSRC (http://shibatch.sourceforge.net/download/ssrc-1.29.zip)?
It would be good also for analog output, as the quality is better than for example SoundBlaster's hardware conversion (IMO).

Anyway, good work on the ac3filter, I always wanted a realtime ac3 encoder, even considered buying an nforce2 platform because of this.

[obieobieobie]

Great job Valex! I love Ac3filter.

Is the new ac3filter supposed to decode mp3 streams in avi-files?

Using Zoomplayer 3.20 I get both the standard Fraunhofer MP3 decoder in WinXP and the new ac3filter showing up.

Edit: By deactivating PCM decoding in the ac3filter system config, it stopped showing up, but it showed up when I disabled both the MPEG audio options.

[KpeX]

Excellent work valex I finally had time to test and the new features are working flawlessly on my box, AC3 encoding on the fly uses surprisingly low CPU and audio sync stays right on. I agree with athos that a resampling to 48Khz feature would be great for upmixing music on the fly. Cheers,

[E-Male]

I wanna second (third?) the resampling idea

resampling to 48khz (if source is not 48khz yet) and encoding to 5.1 ac3 at 640k on the fly would rock

that will help the new multichannel audio codecs a lot

looking forward a lot to the final release version

E-Male

[Tuning]

Thanks valex,

but i don't understand why ac3 filter is used while decoding AAC?

[yidaki]

ac3filter works as matrixmixer aswell, that's why it pops up while decoding other sound formats.
it disperses a 2.0 stream like a stereo mp3 to all your speakers(or atleast 5.1)

it would seem ac3filter is a litte buggy when using it together with reclock though, audio disappears for 3-5seconds once every 15min or so (even more often when used together with spdif, but i dont really need spdif when i'm using ac3filter so it's ok)

[SeeMoreDigital]

Yep this app is truly awesome!

And it arrived less than two hours after I asked about such an tool here. What a stroke of luck!


Many thanks

[rjamorim]

Originally posted by Valex
* AC3/DTS/LPCM/MPEG Audio layer I/II decoding support

Just wondering... why no layer III decoding?

(Please don't hate me if it's there and Valex forgot to mention... I didn't download it... waiting for a stable version )

Also, don't you think it's about time you change the filter's name?

[DSPguru]

Great news!

Originally posted by rjamorim
Also, don't you think it's about time you change the filter's name?

good point, mate

[SeeMoreDigital]

Originally posted by rjamorim
Also, don't you think it's about time you change the filter's name?

I was just thinking that myself. It's obviously much more than an AC3 (Dolby Digital) DSdec filter now!

Personally I would really love it if it could process AAC LC and HE streams too, then it would become the ultimate S/PDIF tool!


Cheers

[obieobieobie]

I like the name AC3filter. It's not good marketing to change name now.

[SeeMoreDigital]

Originally posted by obieobieobie
I like the name AC3filter. It's not good marketing to change name now.

I understand what you mean. The thing is this is a brand new tool which can do way more than decode AC3 (aka Dolby Digital) streams.


Cheers

[DKDIB]

Valex wrote:
> * AC3/DTS/LPCM/MPEG Audio layer I/II decoding support
> * AVI/AC3 & AVI/DTS support

Great news!!!
:respect:



Tuning wrote:
> but i don't understand why ac3 filter is used while decoding AAC?

I agree.
IMHO it's not a good idea to make a single DS filter that decodes too many formats, because the source is quite difficult to manage (bugfixes, new features, optimizations, ...) and some users may prefer an other decoder for some format.



E-Male wrote:
> resampling to 48khz (if source is not 48khz yet) and encoding to 5.1
> ac3 at 640k on the fly would rock

Sycho wrote:
> is it possible to have a 7.1 output from AC3filter.

IMVHO they're a couple of very interesting features (especially the 1st one).



Time is money wrote:
> I found if I want WMP play a dts audio file, I still need a source
> like Gabest's dtsac3source.ax

Arimicio for this info! ^__^

[rjamorim]

Originally posted by DKDIB
I agree.
IMHO it's not a good idea to make a single DS filter that decodes too many formats, because the source is quite difficult to manage (bugfixes, new features, optimizations, ...) and some users may prefer an other decoder for some format.

It shouldn't be difficult yo manage if each format has a good library.

The MAD library is stable, the Vorbis library is rock stable, the FAAD2 library has been stable for the last few months (although it tends to change a little whenever support for a new AAC profile is added), a52lib also seems to be stable.

If the format has a good library, and it gets updated, you just need to drop it in the place of the older library, and recompile. There should be no problems.

BTW: ffdshow is a single DS filter that decodes too many formats, and it's a great filter neverthless

About users wanting another decoder for a specific format: Valex should do just like Milan, and let the user decide which formats you want associated with the filter and which you don't.

Regards;

Roberto.

[Mitchjs]

WOW!

valex its great!!

Im having a few issues... not 100% sure what they are

mostly DTS passthou... I couldnt get a .DTS file to pass
its 44.1k sampling... that if it passed would play tune...
and if it passed and got Kmixer screwed id get noise, but
nothing passed...

also i think it caused the playback program to hang

could you make a option to disable all AC3 encoding...

I have a Nforce board and want the encode to happen via hardware

basicly, i enable SPDIF and check PASS DTS & AC3
but i want my pcm, passed un encoded, so my HW can do it


Valex, again wonderfull code

...I prob didnt have to buy the nforce2 board
I have a few wma 5.1 audios and needed it out spdif
for my decoder to do...

Mitch

[Shayne]

Hi has anyone got spdif passthru of 48 Hz dts to play? and if so what settings are being used?

Thanks

Peace

[pogo stick]

Originally posted by DKDIB
Tuning wrote:
> but i don't understand why ac3 filter is used while decoding AAC?

I agree.
IMHO it's not a good idea to make a single DS filter that decodes too many formats, because the source is quite difficult to manage (bugfixes, new features, optimizations, ...) and some users may prefer an other decoder for some format.

I may be wrong, but Tuning didn't mean that AAC shouldn't be included in AC3Filter.
AAC decoder is not in yet, but AC3Filter is used after decoding AAC as postprocessor if System -> Use AC3Filter for -> PCM is enabled.
It's something like raw video - all supported in ffdshow.
Please, correct me if I'm mistaken.

[yablo]

Thanks Valex,
I've been looking for the live ac3 encoding feature for some time.

Unfortunately in this version the feature just teases me. It will work for a short amount of time (less than 30sec) before the audio cuts out. Tryed it on two different computers with the same results.

Anyway, I look forward to your next release.