mpeg to divx (mp3 sound sounds bad, weird) PLEASE LOOK

[donjuan80]

I user powervcrII to capture my mpegs cause I can schedule the tv shows that I want to capture (I use to have to wait for the shows and use VirtualDub and capture w/ hauffiman codec)

When I convert the mpeg using TMPGEnc I set it to use the divx codec 5 w/ pcm for audio. Now it sounds fine, just like the mpeg, BUT the trouble begins when I use virtualdub to convert the audio into an mp3. When I do that the sound just doesn't sound right, It's all echoe. IF I just rip the audio from the newly created divx and convert it into an mp3 using anyhing BUT virtualdub, it will sound fine.

Now, I've used virtualdub before, capturing directly into avi (using some motion JPEG codec) and then converting it into divx and the sound was fine. Sure I also captured using no compression but still.

Why would it mess up only in virtualdub (the audio that is). It is still in sync if any of you are wondering. The mpeg sounds fine. The converted divx file made by TMPGEnc sounds fine. The only things that doesn't sound fine is the video that used the converted audio in virtualdub.

If anyone wants a sample (very small) of my mpeg I am more than willing to send to them so they can see what i'm talking about.

PS: I've been doing this for a while now, I know how to use filters, crop movies to make them look nice, etc. I'm no newbie, but this has got me stumped.

[KingJohn]

You tell us what you can do, which is hardly relevant. It would be better to tell us exactly what you are doing in Vdub, it very much sounds like your converting the Mpeg to a very low bit rate, an need to select something higher.

If you rip the audio, its uncompressed at 44.1khz is it not ?

[donjuan80]

when I convert the mpeg using TMPGEnc I convert the sound using uncompressed pcm at 16bits, 44hz stereo. NOW, If I just take that audio from that avi file and convert it to mp3 using anything else than vdub it will sound ok, lets say i use 128 bits, 44hz, stereo on the mp3. Now if I try encoding the same WAV in vdub (128bits, 44hz, stereo) it will sound messed up. It will sound echoe. This only happens when converting from mpeg sound to wav and then to mp3 in vdub.

I even tried opening the mpeg in vdub and converting the sound right there. The mpeg converts fine to divx but the audio still sounds echoe. IF I take the audio again to wav and encode it using anytihng else but vdub it will sound fine.

Just in case u r wondering, vdub does work normally. I tested it using a regular wav (44hz, 16bits, stereo) and converted it in vdub (MP3) using 128bits, 44hz, stereo and it sounded fine.

I have tried the lame codec as well as the radium mp3 codecs. They both give me the same results when doing mpg to wav to mp3 (in vdub).

[donjuan80]

A CORRECTION

I have tested converting the mpeg in TMPGEnc to an avi w/ pcm (44hz, 16bits, stereo) and another avi w/ mp3 (128kb, 44hz, stereo). The avi w/ pcm sounds fine but the one using mp3 sounds bad. So it is NOT VDubs vault, something must be wrong w/ the way the mpeg was made or something.

Again, IF I rip the audio out using pcm and make an mp3 out of it it using an audio encoding program it will sound fine. But if I do it through a video program it will sound bad. I have a little test file if anyone wants to tro to convert it and see what i'm talking about.
contect me if u want it.

[aguillon]

Sounds to me like a 48hz / 44hz conversion problem, or an AC3 conversion problem, or both.

VirtualDub is not very good at handling audio conversions directly into frameserves. I have found that the best way is to demux, convert the audio separately and encode the 2 separate sources.

Where the source is AC3, I extract using the VirtualDub AC3 version, then convert the audio to PCM using HeadAC3he.

Cheers

[KingJohn]

I wonder if the MP3 encoder your using is different to the one you are using in a audio edit program. Also conversion is fine, but compression is no good, so if you had a 48Khz AC3 and compressed it to 44.1Khz then the speed would change. Naturally converting from one to the other should be fine.

I just checked my MP3 codec its listed as "Fraunhofer IIs Mpeg Layer 3 Codec professional" I have installed Nimo, as well as the 3 MP3 add-ons listed for Goldwave www.goldwave.com