Re-encoding only the sound component

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Re-encoding only the sound component

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mozza2001

Newbie

23. May 2005 @ 08:23

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Hi,

I'm hoping someone can help with a problem I'm having. I've spent a few days trawling the net and have tried a couple of solutions to my problem but have not found anything to my satisfaction.

I have recently purchased a Dlink 320 media centre and am generally happy with it (after several weeks of playing around with firmware, media centre s/w etc) but some of my videos won't play because the box does not support AC3 sound.

I have tried re-encoding these with VirtualDub but I'm not happy with the reduction in quality of the video element (presumably becuase of the lossy decoding and re-encoding).

Is there anyway that I can split out an AVI file and re-encode ONLY the audio element leaving the video component untouched? Any help or suggestions would be greatfully received as I'm coming to the end of my limited knowledge now :(

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celtic_d

AfterDawn Addict

23. May 2005 @ 20:47

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Set the video to direct streaming.

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The_OGS

Senior Member

26. May 2005 @ 20:30

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If you have an AC3 AVI and you need MP3 audio instead (right?) that's a big job - but an audio job only :^)
Yes just direct stream the video like d said.
I would use Nandub, open the AVI and select save WAV.
It will demux the audio file.
It may say WAV, but it will be I think in its native format ie. AC3 in your case.
Once you have an AC3 file, you need to use BeSweet (Azid) to decompess it to WAV. It's a little bit artistic here, because you can adjust your downmix from 5.1 channels to 2-channel. You can adjust boost, normalization, compression level, etc.
There is a well-known trick of mixing the LF (subwoofer) channel into the main L & R, at the recommended -3dB.
Learning Azid is probably the most challenging part of the job!
Then, encode to MP3 (hopefully VBR?) in whatever way pleases you.
I use LAME 3.96.1 with CDex.
Then re-mux AVI using Nandub.
Hope this helps,
Regards

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This message has been edited since posting. Last time this message was edited on 26. May 2005 @ 20:31

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