Audio quality when converting DivX to SVCD

[raunso]

Hi

I've been using TmpgEnc to convert some DivX movies to SVCD using the TmpgEnc template.

My problem is that the audio seems to be degraded considerably in quality after the conversion.

Is it an audio codec problem? How do you guys convert without quality loss on audio? What codecs should I install?

Cheers,
Raunso

[bugster]

This is likley to be caused by using TmpGenc to do audio sample rate conversion. I think SVCD uses 44.1khz (CD Quality) audio samples (correct me if I am wrong) whereas many Divx movies have 48Khz audio as ripped directly from the DVD. Tmpgenc sample rate conversion is not great. Use virtuladub to seperate the audio and video streams from the Divx (see the howto's for details). Then resample the audio (virtualdub can do this too, better than TmpGenc but dedicated audio tools do it even better!) and supply the seperate audio and video streams to TmpGenc when you encode. This way TmpGenc does not have to resample the audio and you get better quality.

Hope this helps

[raunso]

Thanks for the reply. Yes, that is exactly the problem.
The DivX is in 48 kHz. I've tried saving the audio as a .wav-file (44.1 kHz) using Virtual dub. But the quality really degrades by this. It is clearly audible, the downsample, when I try to play the .wav-file. And this is using Virtualdub... so what do I do now?!

You said something about dedicated audio converters? Can you name some?

Woops. Just tried Virtualdub again. This time clicking the High Quality option in the Conversion menu. Now it sounds great.
They should add that to the guide on vcdhelp.com!

Anyway, problem solved. Hope some people might benefit from this as well. :D Still interested in the names of the dedicated audio tools, though.

Cheers,
Raunso

[bugster]

Dedicated audio tools:

BeSweet - shareware or freeware I think - gets mentioned a lot in these forums bit I have not used it
sonic SoundForge - commercial - and the one I use

Sure there are many others, perhaps others could post the names of their favourite audio tools