How to Extract Mono Track from Multilingual AAC Decoded data

[medha]

HI All,
I am working on AAC-Audio decoding interface.

We have few clips with multilingual - Japanese and English.

From the decoded output, how to extract individual language information? - i.e., to play only english, or only japanese or both simultaneously.. (Decoder supports decoding of CCE elements)

Thanks in advance,
Medha

[tebasuna51]

Please put a MediaInfo report of the original clip and a list of the decoded output.

[medha]

The input data is AAC (Mpeg2-TS) and the decoded output is in PCM format.

Num Chnls - 1
Sampling Freq - 48000
SBR Flag - ON (Enabled)
SBR Up Factor - 2


There is some problem in attaching the document, hence pasting the decoded output below..

E3FA 88FA 30FA E7F9 B9F9 ACF9 C2F9 F7F9 45FA A0FA FEFA 54FB 9AFB C9FB E0FB DFFB C9FB A1FB 6CFB 2EFB EBFA A8FA 68FA 31FA 08FA F0F9 EEF9 02FA 2DFA 6AFA B6FA 09FB 5CFB A8FB E9FB 1DFC 46FC 67FC8 5FCA 6FCD 2FC0 BFD5 4FDA BFD0 FFE7 9FEE 4FE4 BFFA BFFF FFF4 7008 200B 300D B00F B001 6012 F014 8016 2017 F019 F01C 301E 9010 F023 0024 A025 6025 2023 B021 202D 8019 2014 501F A00B 8008 3005 E004 A004 6004 D005 B006 B007 A008 5008 B008 E008 F008 F008 E008 B008 5007 9006 3004 4001 C00E EFFB DFF9 2FF7 3FF6 5FF6 BFF8 7FFB 4FFE EFF2 C006 7009 600B 300BC


Thanks and Regards,
Medha

[tebasuna51]

The input data is AAC (Mpeg2-TS) and the decoded output is in PCM format.

Num Chnls - 1
...

If you have only a channel with both languages mixed you can't extract nothing. Sorry.

[medha]

HI,
Thanks for the reply.
Actually the input AAC data contains both the languages data. Do we need to set any flag to indicate the decoder that the input data has two languages and decode only one language or something like that? If so, please let me know what kind of settings/configuration required to set the decoder.

I am pasting the AAC Input data for your reference.

FFF8 5800 1EC1 ECF6 3B01 3011 1912 8442 A044 F05D 6A54 F5A6 879C 355D DDCD DDAF 7A1C C562 89F1 EA1A 1A14 8CF6 697C 63D8 CC15 CD6F DCBC AA8A FFB1 DF49 6303 C0CF 277E B49B 633A F10A 1697 F505 3D6C A45C 288E 9B4C 57D6 007D 5D97 C804 4F1C E669 2292 D425 69C4 73EE E9F9 6E4D 89AD 3D29 6073 D5DD F81C 4F32 6480 2200 0006 7022 3225 0885 4089 3717 B9AD E497 7C73 C5EF 595B D49B E229 068A 2992 8A3A BED2 D4AA 8063 86B7 E434 8A65 C2BB E630 C64D 0D7F ADF3 36E5 54B3 A939 24F8 ABB2 EC32 E190 55A0 AFAB ADDA 4D6D 7728 4E48 3DD4 015D 97DF 22D5 9BA4 44D0 D250 4165 C4DF FA39 8783 1456 C569 5A73 86BE D080 E879 C992 49C4 C840 0C1C FFF8 5800 2081 EC37 9D01 3411 1912 8581 089C AF22 78F6 1ADF 0A87 7C6B 255A 202F 8794 EBAA 4FE9 A566 B936 92BE 85C2 2F2D 6E6E 55C1 831A 9C35 3FB7 F71D 6214 C6E7 1517 1C62 22ED 548D 41D1 28BE 8FD1 22B2 B4E8 DEB0 9A2E 6B84 5294 2EBD 5E13 452D 8ACC CD17 70DC A6A8 CE8D 6B9F D3BE 58AC A572 4158 6A41 EDC4 FB38 CD02 AC67 C3B9 0DCB D31C C000 CE04 4644 A160 4250 BAD7 3C7C FC4A 9C6D 64AD BCD1 041B 35E4 B3E8 9BD4 34A2 F40D 9DB3 87D1 BBE1 861C DC63 5E4A ADF5 D4FF ADE9 EB75 92EE 4F1D EADB EC2A 6228 9BBA EB17 F2FF 8800 5657 728B C5D4 4784 0DD0 C747 4FE8 98C5 2A31 177B 54A9 2D45 E595 441B DEFD 3BDD D4F2 05CA 4A92 C5E4 4485 B3B8 E02A 863C 3AC7 72FA E5CC 0380 FFF8 5800 1F41 EC51 3301 3011 1912 8442 A084 EF77 2AE7 7F1E FE68 B469 365C ACB8 419F E31E 2F98 F957 286A 50EA 3CD7 5A63 8EA7 0E67 4E70 BA95 6B7F 80AC 35D3 1C0C 03E7 3EE7 3E36 5CA7 5BDB 371B BFCD 8AD9 595A D2A5 2353 4BE7 CA10 2A8C 7EFA 9008 9A54 44E1 56DC AEA8 AB56 BF6C 7069 885A AB8A F7EE 9CEA 59B5 7240 075B 3309 9212 0B00 019B 088C 8942 C084 CA5F 5DCA 9DF9 AD61 756B AE78 936D 009F 0D73 E144 BED8 9591 237C 651E 8F88 C638 66DA BCB3 C71C 757F 3CE0 46DC 5A57 5E8B 9CC4 4D97 A223 33BA D6EF 57F5 E054 5699 2855 86AA FED2 322D 77F5 E664 5296 4A29 72CB 4B98 A921 7BCF AAD7 4EC4 047E FCE7 5264 F44B 3576 C607 5733 9084 0220 0070

P.S. I couldnt attach any documents, can any one let me know the cause for that

Thanks and Regards,
Medha

[kypec]

P.S. I couldnt attach any documents, can any one let me know the cause for that

Thanks and Regards,
Medha
Use some free filehosting services like http://mediafire.com for storage of your attachments, sample clips etc. It is strongly recommended to not attach anything larger (>1 KB) on this forum directly.

[tebasuna51]

Please put a MediaInfo report of the original aac/m2ts file.
I don't need a hex dump of the data.

[medha]

@tebasuna51

HI,
The input data is of Mpeg2- AAC type - Used in ISDB-T OneSeg streams

Num Channels: 2
Sampling Freq: 48000

Can you please tell me what do you mean by Media Info Report exactly?

Thanks and Regards,
Medha

[tebasuna51]

MediaInfo is a tool (search in Gogle) to know what kind of header/container have the AAC stream.
If you can decode the stream in PCM data in WAV container you can after separate the two channels with WaveWizard for instance.

[medha]

HI,
This is the mediainfo report for the input file:

General
Complete name : D:\Audio_MultiLing.aac
Format : ADTS
Format/Info : Audio Data Transport Stream
File size : 1.11 MiB
Duration : 3mn 28s
Overall bit rate : 44.5 Kbps

Audio
Format : AAC
Format/Info : Advanced Audio Codec
Format version : Version 2
Format profile : LC
Format settings, SBR : Yes
Format settings, PS : Yes
Muxing mode : ADTS
Duration : 3mn 28s
Bit rate mode : Constant
Bit rate : 44.5 Kbps
Channel(s) : 2 channels
Sampling rate : 48.0 KHz
Resolution : 16 bits
Stream size : 1.11 MiB (100%)


MediaInfo Report for the decoded output:
General
Complete name : D:\AMLIL1.wav
Format : Wave
File size : 680 KiB
Duration : 7s 253ms
Overall bit rate : 768 Kbps

Audio
ID : 0
Format : PCM
Codec ID : 1
Codec ID/Hint : Microsoft
Duration : 7s 253ms
Bit rate : 768 Kbps
Channel(s) : 2 channels
Sampling rate : 24.0 KHz
Resolution : 16 bits
Stream size : 680 KiB (100%)

Please let me know, if you need any more information.

BestRegards,
Medha

[tebasuna51]

Perfect. Now we know is a .aac file, with ADTS headers, LC+SBR+PS, 48.0 KHz, 2 channels, 3mn 28s long.

But seems there are a problem with your decoded file:
Is 7s 235ms only?
And 24.0 KHz only, seems don't recognize the SBR part in aac.

What is your decoder?
Try with FAAD2v2.7 (http://www.rarewares.org/aac-decoders.php) or Foobar2000

[medha]

HI,
I got the problem.
Actually the decode data is interleaved at Sample level and each sample is of 16bits.

I extracted alternate samples from the output data and the sampling frequency is also divided by 2 (24k/2 = 12k). Then it started playing the individual language data.

The decoder i am using is - HE-AAC decoder. There is some other problems in the decoding, due to which the output file is of very less duration.

Thank you very much for your help.

Best Regards,
Medha

[medha]

HI,
The decoder i am using is - HE-AAC decoder.

Sorry, forgot to mention the decoder. It is Helix AAC decoder.

BestRegards,
Medha