Sound Quality

[iceman]

Is it possible not to compress the sound file as I am not happy with the sound quality using 224 bitrate lacks that punch? I want to use the wave file down sampled to 44.1, how do I do it?

[UltimateDBZ]

Downsampling to 44.1 is probably the source of your audio trouble. 224 is plenty as far as bitrate goes. Do not downsample unless you really want to conform to the SVCD specs (for some reason) - it merely cuts down quality.

I'm not sure I understand your question exactly, could you give some more detail? In DVD2SVCD, you simply uncheck the downsample box in the Audio tab.

[gerti67]

Hi iceman,

if you don't want any compression with the audio streams, just go to the "Audio" tab, hit the little dropdown arrow in the "BeSweet" box and set the "Overall dynamic compression" parameter from "Normal" to "None" - that should do it.

And as UltimateDBZ already mentioned, the downsampling is not necessary - although it's against the SVCD specs - but it can introduce audio "artefacts" so better keep it at "48 kHz".

Hope this helps,
Gerti

[iceman]

About down sampling I have read it somewhere that the top decks DVD players have problems if you do not down sample, is it true? That is the only reason why I have down smapled to 44.1.

[Jason28]

All DVD players should be able to play 48 kHz as that is the spec of DVDs. The only reason that the downsample is there is because thats what the "specs" of SVCD call for. I dont use them as they make the quality worse and they only add to the encode time.

[iceman]

Thanks for that Jason. I will experiment to encode at 48 khz. You are right about adding to the encode time.

[SVCDlabels]

In this thread about speed factors http://forum.doom9.org/showthread.php?threadid=28810
you posted the log which shows that you did downsample the audio :confused: yet here you say you don't.
Am I reading this correctly and if so without the downsample wouldn't that 2 plus hour encode be even faster? I'd like to try the settings that you suggested, I also have an XP1800.

Thanks,
SVCDlabels

[Jason28]

I dont use audio downsamle. I am not to sure why its in the avs script. I dont think that it does anything when its there. As far as I know BeSweet is the one the does the resample and by that piont BeSweet already did its stuff. :)

[SVCDlabels]

Ok, thanks. :)

[gerti67]

Hi there,

the "ResampleAudio(44100)" statement in the Avisynth script has nothing to do with the audio conversion, it's there because some people reported that this can solve some AMD Athlon issues/crashes with CCE 2.50 SP. That's the ony reason for it being in there. ;)

Hope this helps,
Gerti

[UltimateDBZ]

You can take it outta there if it bothers you (and you don't have an Athlon) by simply unchecking thte Add ResampleAudio checkbox in the frameserver tab.

[ramutan]

Originally posted by Jason28
All DVD players should be able to play 48 kHz as that is the spec of DVDs. The only reason that the downsample is there is because thats what the "specs" of SVCD call for. I dont use them as they make the quality worse and they only add to the encode time.

I agree with Mr. Jason28 here, the encoding time that downsampling adds to the procces is about 25% to 30% or may be more; I used before and thee is no reson why use it.
Same as you I wanted the SVCD to be copliant, but I just quit doing it and now I'm more happy and no to mention the time you save. :D

[UltimateDBZ]

Unless you are one of the few that doesn't live in China, and actually has a standalone SVCD player, there is no reason to downsample. Extra time and less quality. I'd estimate at least 95% here play their SVCDs in a DVD player, which by standard must support 48khz audio. It only makes good sense, therefore, not to downsample :)

[smirk]

I tried creating an SVCD for my Panasonic RV-31 without downsampling the audio, and all the voices came out too low. It was really weird sounding!

So it appears that at least some DVD players require the downsampling.

How does BeSweet's dynamic compression affect sound quality? The T-Rex's roar in Jurassic Park seemed to lack a whole lot of punch when I did that movie. I remember being scared senseless from the audio when watching the actual DVD. (well, not actually scared, you know..)

Thanks!