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Extracting AAC from Matroska H264

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Sakura90:

--- Quote from: mizore on December 31, 2009, 01:00:08 PM ---Oh, well it doesn't matter.  I will be reencoding into a Matroska container using the AAC.  Or, I can always convert to AC3... regardless, that isn't the problem. ;D  I know how to proceed after I have the audio. The only issue is proper AAC extraction.  Nothing I have tried extracts the AAC into the original format.  Every program I've tried cuts the sampling frequency in half.

Nyquist-Shannon is tormenting me.

--- End quote ---
Your mkvextract must be on weed or something... here's what my mkvextract just did (MKVExtractGUI v1.6.4.1):




Both have the same sampling frequency ;D

mizore:
Yeah, that's the funny part.  I can extract 2 channel with no problems.  Input resulting AAC into muxing program (mkvmerge, avanti, etc.) and everything works perfectly.

However, try it with 6 channel AAC.  I am betting you get the same problem I do.

Sakura90:

--- Quote from: mizore on December 31, 2009, 09:25:10 PM ---Yeah, that's the funny part.  I can extract 2 channel with no problems.  Input resulting AAC into muxing program (mkvmerge, avanti, etc.) and everything works perfectly.

However, try it with 6 channel AAC.  I am betting you get the same problem I do.

--- End quote ---
Betting? What did I win? ;D

Again, your mkvextract must be having some serious weed. Here, both streams have 6 channels @ 48 KHz (in the MKV and extracted):




I don't know why you have that problem :(

mizore:
File input into Avanti:

Format                           : AAC
Format/Info                      : Advanced Audio Codec
Format version                   : Version 4
Format profile                   : LC
Format settings, SBR             : Yes
Format settings, PS              : No
Muxing mode                      : ADTS
Bit rate mode                    : Variable
Channel(s)                       : 6 channels
Sampling rate                    : 44.1 KHz
Stream size                      : 60.9 MiB (100%)

Avanti error:

Resampling with input channels greater than 2 unsupported.

Can not resample 6 channels @ 22050 Hz to 6 channels @ 44100 Hz


 >:(


I'm not resampling if the input file is 44.1khz and target specification is 44.1khz...?!

blud7:
I dunno but it seems your problem is Avanti, probably not being able to recognize as well as process the extracted audio stream.

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