BeHappy - AviSynth based audio transcoding tool (UPD 19-07-2006)

[GMJCZP]

Thanks, I will analyze your reply, thank you very much.

[jones1913]

I've just packed a new release and wrote some lines to the wiki.

Have fun!

[LigH]

I will.

[tebasuna51]

Thanks jones1913.

Is it possible to build this nightmode downmix into BeHappy but to normalize the matrix to prevent clipping?

Originally Posted by robertcollier4

This "nightmode" preset uses the following channel matrix:
FL' = FC + 0.30*FL + 0.30*BL
FR' = FC + 0.30*FR + 0.30*BR

I'm not sure how to normalize the matrix myself. It looks as if it should be something like...

FL'= 0.2929 + 0.1875 + 0.1875
FR'= 0.2929 + 0.1875 + 0.1875

..but the total is significantly below 1.0. (I know that the total doesn't have to be exactly 1.0, but should it be this much less?)

[tebasuna51]

In FL' = FC + 0.30*FL + 0.30*BL

the max value is 1.6 then the normalized version is:

FL' = (1/1.6)*FC + (0.30/1.6)*FL + (0.30/1.6)*BL = 0.625*FC + 0.1875*FL + 0.1875*BL

Thank you! For some reason, I divided the value for FC by the wrong number. I knew something didn't look right. Would this work?

flr = GetChannel(a, 1, 2)
fcc = GetChannel(a, 3, 3)
lrc = MixAudio(flr, fcc, 0.1875, 0.625)
blr = GetChannel(a, 5, 6)
return MixAudio(lrc, blr, 1.0, 0.1875)

[tebasuna51]

Yes, this is the avs code for that downmix.

^ Thanks very much! If it would possible to build it into BeHappy at some point, that would be most useful. :-)

[tebasuna51]

Originally Posted by Richard1485

^ Thanks very much! If it would possible to build it into BeHappy at some point, that would be most useful. :-)

Done.

Replace ...Behappy\extensions\d_DownMix.ext with the attached one.

You can edit d_DownMix.ext and add your mixes.

¡Eres muy trabajador!

Thanks for your help and hard work!

[siella]

I changed url ext. of dts also upmix ext. doesnt have <LoadAvsPlugin> parameter for soxfilter.
I made stereo to 2.1 (lfe) upmix dsp plugin. only dts and ac3 encode give you 2.1 audio. when you dts encode you have to choose channel conf. (L,R) and click to Add lfe channel

Thanks for your effort, jones1913

[tebasuna51]

Originally Posted by siella

I changed url ext. of dts

Thanks, I updated the link also in Doom9 thread then the e_FFdcaenc.ext update is not necessary.

also upmix ext. doesnt have <LoadAvsPlugin> parameter for soxfilter.

Thanks, before only work if soxfilter.dll was in autoload plugins folder.

I made stereo to 2.1 (lfe) upmix dsp plugin. only dts and ac3 encode give you 2.1 audio. when you dts encode you have to choose channel conf. (L,R) and click to Add lfe channel

I can't recommend use this upmix function:

l = GetLeftChannel(a)
r = GetRightChannel(a)
lfe = ConvertToMono(a).SoxFilter("lowpass 120","vol -0.5")
return MergeChannels(l,r,lfe)

Any audio player with 2.1 speakers do this job better with 2.0 input, because:

1) Make the lowpass cut (here 120 Hz) with the appropiate frecuency to the attached speakers.

2) Low frecuencies aren't eliminated from FL,FR and the audio player still extract them to subwoofer adding to LFE content.
That addition can cause a over-mix or a sub-mix if there phase shift's in the low pass sox filter.

Please don't mistake LFE channel with subwoofer speaker.
Any 2.1 audio player send to subwoofer the low frequencies present in all channels.

Is always a bad idea create a LFE channels if not present in source.
Never make 2.0 -> 2.1 or 5.0 -> 5.1
If you need 5.1 for some compatibility create a empty LFE.

[siella]

thank you for information
do you recommend convert 5.1 to 2.1 with using orginal lfe channel ?
You know people doesnt use 5.1 system anymore, usually use soundbar.

Max bitrate of eac3 is variable for each sample rate so i updated eac3 ext.

[LigH]

I am no expert in this regard ... but for movies, I would possibly keep the LFE (in case it contains extra cinematic effects), and convert the full range audio preferably with DPL-II (IMHO it sounds nice even with stereo speakers). Personal preference.

[tebasuna51]

Originally Posted by siella

do you recommend convert 5.1 to 2.1 with using orginal lfe channel ?
You know people doesnt use 5.1 system anymore, usually use soundbar.

Downmix to save space disk is now not necesary at all, then the downmix is recommended to adecuate the input audio to the audio player:

1) Downmix to stereo 2.0, even with special mix prioritizing Center channel.
Recoded to AAC (or AC3 for very old players)
- To play with stereo TV's, old stereo only players or streaming.
- Is not recommended use the LFE channel in the mix (but you can try it)

2) Downmix to DPL 2.0 only recommended for old audio players without support for 5.1 input but with DPL decoder and surround speakers.
Recoded to 2.0 AC3 dpl marked.
Dolby do not recommend use the LFE channel in the mix (but you can try it)

3) Maybe a downmix 5.1 -> 2.1 for an audio system 2.1 speakers can work fine.
I never test that, but mix front and surround channels can't be bad for low frecuencies (surround channels don't have them normally).
BTW not all audio systems 2.1 have spdif input to support AC3 2.1 (or HDMI to support PCM 2.1), most of them have only 2.0 analog input and a mix 2.1 is unusable.

But I can't recommend a downmix for a soundbar than stand for a 5.1 (at least) input. Try to do their job before can be a problem, let apply their specific downmix.

[siella]

Well actually i have plan making other language of movies 2.0 channels to 2.1 using lfe from 5.1 audio orginal language of movies. I have soundbar and i ll test if i find spare time

[LigH]

Every time someone has the great idea to mix channels from different audio streams into one, I can feel Agrajag crying: "Oh no, not again!"

[siella]

I think it will be fantasy

[eca2424]

Originally Posted by siella

I think it will be fantasy

Thanks for BePack Tools sir. That is most useful for me. I will Follow the updates for BeHappy and BePack. :-)