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Old 20th December 2001, 23:46   #1  |  Link
Bubba
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How to make Audio VCD compliant?

I'm not sure this post should be here or in the Audio forum, but the question I'm about to ask is related to VCD, and so I decide to post it here.

I download some MPEG clips, and I noticed that the Video part of these clips look VCD-compliant (i.e. 352x240 or 352x288), but the audio part are not. Some have lower frequency than 44100 Hz, some have different bit rates that the required 224 Kbits/sec for VCD, and some have only 1 channel instead of 2. I was thinking ...

1. Demux the video & audio part using TMPGEnc. This will produce a MPV file & a MP2 audio file.
2. Convert the MP2 to Wav
2a. Create another channel of Wav (L & R)
--Note: Do I need this step 2a? (I'm not sure that VCD-compliant need 2 audio channels or not)
3. Up-sampling the Wav to 44100 Hz
4. Re-encode the upsampling file from step 3 to VCD-compliant MP2 file at 224 KBits (using tooLame).
5. Mux the step 4's MP2 file back to the MPV file from 1.

These steps should get me a VCD-compliant MPEG clip. Anyhow, I know how to do step 1, 4, and 5, but I do need help or guidance to do step 2, 2a and 3.

Thank you in advance & merry X-Mas!
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Old 21st December 2001, 19:02   #2  |  Link
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After reading some topics over the Audio forum, I think I can use SSRC to upsampling the Wav file to 44100 Hz.

If SSRC can do this, then the steps I still need help are step 2 & step 2a.

Thanx
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Old 26th December 2001, 15:48   #3  |  Link
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to convert the mp2 to wav use tmpeg's file=>output to file=>WAVEfile.

to add the second channel any decent wave editor should do it.
try cooledit.
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Old 27th December 2001, 13:50   #4  |  Link
Psyche
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I advise you to NOT use TMPEGEnc to decode MP2. Here you can get MADPlay (and the link to MAD Homepage). This sounds a LOT better than TMPEG (due to dithering, noise shaping and a great quality decoder).
What is more, it allows you to output a stereo wav from a mono MP2 so this solves 2a also.
Unfortunately it's a command line tool (not that I mind, in fact I like CLI tools ), and I don't know if there is a GUI available.
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Old 31st December 2001, 22:41   #5  |  Link
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Hi Psyche,

I follow the link you provided, and it brought me to the following site: http://home.pi.be/~mk442837/

In this site, I could not find the program "MADPlay" as referred in your message. The only references that have the word "MAD" are in the "some audio related programs" section:

* mad-0.14.2b mad's sourcecode 10 Nov 01
* mad-0.14.2b mad's Win32 binary 10 Nov 01 161k
* MAD plugin for winamp

Did I miss something?

Thanks
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Old 1st January 2002, 22:05   #6  |  Link
Psyche
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Yup! Sorry, the program is called madplay but it's this zip the one you have to DL:

mad-0.14.2b mad's Win32 binary 10 Nov 01 161k

Sorry again!
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Old 4th January 2002, 18:50   #7  |  Link
dinesh
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I am not sure whether this is the right method but it works for me.

1. Open your MPEG1 file in VirtualDub( http://www.virtualdub.org ).
2. Select Audio -> Full Processing Mode
3. Select Audio -> Conversion
4. Choose Sampling Rate as 44100, Precision as 16 Bit, Channels as Stereo.Click OK
5. Select File -> Start Frameserver and Frameserve to TMPGEnc. (0r)
Try File -> Save as WAV and load the WAV file in your Audio Source in TMPGEnc
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Old 4th January 2002, 20:39   #8  |  Link
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Thanks. I will try it.
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Old 11th January 2002, 18:10   #9  |  Link
Bubba
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First of all, I would like to thanks everyone that have answered my question, especially to Dinesh. With your help, I have successfully made non-compliant VCD clips (because of Audio) to non-compliant ones, and all of them play fine on my standalone DVD/VCD/SVCD Player.

Here are my findings. I used the following 2 apps to make VCD Audio-compliant, and both work fine:

1. VirtualDub (with the steps as disnesh pointed out in his reply)
2. dBpowerAMP Music Converter (very easy)

These 2 apps will convert your non-VCD Audio to a 44100 Hz/stereo Wav file. This should cover the steps 2, 2a, and 3 stated in my original questions. I used either TMPEGEnc or bbMPEG (both work fine) to mux/encode to create the final VCD clip.
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