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Old 29-11-06, 09:34   #1
B139B

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Default Free software for remixing ac3 files?

Hello
Does anybody know about a freeware that can remix the 5 channels in a ac3-file and save it as ac3?

This is what i want to do:
-Load a 558-vobfile into VirtualDubMod
-Extract the ac3
-Remix the 5 channels of the ac3 and save the file
-Load the new ac3 into VirtualDub and make a DivX w/ac3
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Old 29-11-06, 10:56   #2
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Maybe this one ? http://www.videohelp.com/tools?tool=...ube_Transcoder
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Old 29-11-06, 11:08   #3
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Have you tried fccHandler's AC-3 ACM Codec and VirtualDub-MPEG2 ?

Link : http://fcchandler.home.comcast.net/index.html
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Old 29-11-06, 12:54   #4
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Sorry. I don't get the point.

558 vobs have stereo(surround) AC3. There is no rear, no center and no back channels. How could it record an info it never gets?
So it's a stero 192Kbps 48Khz AC3 stream.

You can make Divx with AC3 (better quality by not processing audio any more).

Load the vob in virtualdubmod, make all choices about video compression and cutting commercials. Leave audio stream to "direct stream copy".
Save the avi.

^_^
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Old 29-11-06, 22:57   #5
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Thanks for your answers. Are you sure?
When i play a 558 vobfile in Mediaplayer classic and look at the bargraphs in ac3filter, i can see information in the rear and centerchannels when ichoose surround as output. I can also her the rear speakers at home (DivX w/ac3)

This Transcoderprogram can not save ac3 i remember... i will give it a try (-:
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Old 30-11-06, 08:43   #6
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Use BeSweet : http://dspguru.doom9.net/
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Old 30-11-06, 11:34   #7
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Originally Posted by B139B
Thanks for your answers. Are you sure?...
Yes, I am pretty sure.

But if you don't trust me take a look at the file using g-spot. You'll see "AC3 2 Channels".

You hear sound from both center and rear channels because original stereo programme (movies etc) has been broadcasted with DolbySurround analog matrix encoded audio track. Your software and / or AV receiver is deconding it.

Take a look at: http://headwize.com/tech/dolby1_tech.htm

So, definitely, AC3 from 558 vobs is 2 channels, but can carry multichannel infos as long as the source has been dolbysurround encoded.

^_^
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Old 30-11-06, 13:53   #8
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Originally Posted by Lord_Kiron
Yes, one can maybe upmix the original 2 Ch AC3 in 5Ch Ac3, and be sweet is a rather good choice.

The "upmixing" process means that a DolbySurround decoder extracts the matrixed infos from the two channels and re-encode them as separate channels on to a new audio Track.

Standard 5Ch AC3 use 384K while 2Ch uses 192 so space used is doubled.

Simple process means you get exactly what your AV receiver still gives you making it on the fly, unless you tweak the "unmatrixed" channels even more (delays, eq...).

My receiver does a good job with properly encoded material so I found pointless to tweak with upmixing.

^_^
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Old 30-11-06, 15:34   #9
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I really do not understand what you trying to do.

The DP-558 AC3 is a stereo (2 channels) . You can easily remux it from DP-558's VOB using DGIndex (latest version here: http://forum.doom9.org/showthread.php?t=116841 ) .
As result (amongst other stuff like MPEG file) you will get AC3 file.

This file you can mux to your AVI using VirtualDub(Mod).

That's it.
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Old 30-11-06, 22:43   #10
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Thanks all of you
What i thought is that it could be nice to have the possibility to mix the files and save it as ac3 again.
I will read the links, thanks!
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