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29th November 2020, 15:17 | #1 | Link |
nivedhya
Join Date: Sep 2015
Location: India
Posts: 19
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How to identify stereo wave file fit for 5.1 upmix?
I took a wave stereo, split it to 6 mono wave. Found except FL & FR all other 4 are silent including Center. Hence I presume this stereo wave is unfit for 5.1 upmix and think vocal also recorded with L& R & unable to take out seperately.
So my question is how to identify or select a wave stereo fit for 5.1 conversion and split? Is there any other way to use my above file for 5.1 upmix or no way? |
29th November 2020, 23:53 | #2 | Link |
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Your question is confusing. If you have a 2.0 file, you can't split it into six wavs. But some 5.1 tracks are really 2.0 because only two channels have content: I've come across this with some HDTV broadcasts, and it might be what you are describing.
Take the two channels that have content and merge them into a single wav. Once you have a 2.0 wav, you can upmix it like any other. |
2nd December 2020, 10:58 | #3 | Link | |
nivedhya
Join Date: Sep 2015
Location: India
Posts: 19
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Quote:
Same songs converted by somebody to DTS which means 5.1 & I have that one too. Same songs both in 2 channel & 5.1 channel. Even stereo can be played as Multichannel stereo in 5 speakers except LFE & what I say above is not that one.It is very clear 5,1 with LFE filtered, vocals boosted & in Center separate & similarly Music boosted & in SL & SR. Likewise if I have to convert some other stereo to 5.1 what are the requirement. Hope my message & goal clear. |
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2nd December 2020, 11:02 | #4 | Link | |
nivedhya
Join Date: Sep 2015
Location: India
Posts: 19
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2nd December 2020, 17:30 | #5 | Link |
Moderator
Join Date: Feb 2005
Location: Spain
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You have a Sticky: GUIDE LIST: Stereo-to-Surround Conversion Guides with many options.
I recommend you this one https://forum.doom9.org/showthread.p...51#post1640451
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3rd December 2020, 01:21 | #6 | Link | |||
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No, it wasn't. For example, you said...
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Your original question was about identifying stereo tracks that are suitable for upmixing. That's not really something that can be worked out by examining a file's metadata. Some tracks upmix better than others, but most of the time you just have to try it and see what the results are like. |
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3rd December 2020, 08:43 | #7 | Link | |
nivedhya
Join Date: Sep 2015
Location: India
Posts: 19
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3rd December 2020, 10:51 | #8 | Link | |
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Quote:
You can create a 5.0 or a 5.1 with the LFE empty because: - The LFE is the Low Frequency Effects but not the low frequency from all channels. In a stereo source don't exist Effects, only low frequencies. - All audio surround equipment can be configured to send the low frequencies from all channels to the subwoofer (and by default is recommended do so). Don't mistake LFE channel with the subwoofer in your system. - Let your audio equipment do the filter of low frequencies to the subwoofer to avoid interferences between the rest in all channels and the extracted by you.
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5th December 2020, 06:53 | #9 | Link | ||
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Location: Berlin, Germany
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A while ago I added a few 2ch -> 6ch upmix algorithms to my Wavi_Mod plugin for AVStoDVD. Just the other day I noticed that the channel mapping for the final output.ac3 file looked wrong when decoded with LAV Audio.
I had used this channel merge command (taken from an old post by Selur): Quote:
I found this old post by Jenyok where he posted 4 different output mapping schemes for different output formats: https://forum.doom9.org/showthread.p...87#post1624087 Are these mapping methods correct? I always convert the stereo source to 6-ch WAV, and the conversion to AC3 happens later independently from the upmix routine. To make LAV Audio happy I need to use this mapping which is supposed to be meant for WAV output: Quote:
So do you think this is the correct channel mapping? Cheers manolito Last edited by manolito; 5th December 2020 at 07:09. |
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5th December 2020, 12:48 | #10 | Link | |
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Quote:
We only need know the order inside AviSynth than is the same than the WAV order FL,FR,FC,LFE,SL,SR All encoders accept the uncompressed audio in the standard WAV order, if you supply monowavs (like with sox or ffmpeg) the order must be the same, no mather the internal order of the compressed output format.
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