Oddball micro-detailed question about VCD audio encoding

[xed]

Well, have managed to master encoding and burning VCDs & SVCDs without any problem. TMPGEnc's a wonderful program and well worth the $50.
There remains one peculiar little fly in the ointment -- when I capture .AVIs the audio is in 48 khz format and this can't be changed
on my hardware. Now as we all know, the VCD standards requires
44.1 khz 224 kbit audio with video at 1150 kbits.
So what I typically do is to de-mux the 48 khz audio track using
TMPGEnc ("SAVE as .WAV file" at 48 khz), then sample-rate-convert
and also normalize the audio file (so it's nice 'n loud) then re-save
it at 44.1 khz.
Then I simply use TMPGEnc with the VIDEO SOURCE pointed at the
original .AVI file and the AUDIO SOURCE pointed at the new 44.1 khz
normalized .WAV file.
Ah, hut here's the rub!
I have noticed that I get a slightly metallic-sounding slightly distorted
audio track on my VCDs, as though a very slight amount of ring modulation had been added to the audio.
On looking closer, I noticed that after sample-rate-conversion, the
44.1 khz .WAV file has a bit rate of 192 kbits!
I believe what's going on is that TMPGEnc is reading a 44.1 khz
.WAV file at 192 kbits but assuming it's 44.1 khz at 224 kbits. Encoding
into 224 kbits wihtout doing anti-aliasing etc. is what's probably producing
the audio distortion.
So here's the question:
Anybody know how to convert a .WAV file at 44.1 khz 192 kbits into 44.1 khz at 224 kbits? Some sort of bit-rate conversion is doubtless needed, otherwise TMPGEnc is simply going to introduce something like differential chopper modulation (which is probably what's going on with theaudio distortion). Any time you feed software audio at the wrong
bit rate or the wrong sample rate without doing some kind of interpolation, the result is distortion.
---
Now, I know an ugly and time-consuming work-around... It involves demuxing the audio, converting it to 44.1 khz, then encoding it using TOOLAME and re-multiplexing the separately encoded .mp2 and .m2v
using BBMPEG.
But that's a whole lotta extra steps.
Anybody know a simple way to turn a 44.1 khz .WAV file at a data rate of 192 kbits into a 44.1 khz .WAV file with a data rate of 224 kbits?

[adam]

This is a known problem with TMPGenc. It has nothing to do with the bitrate. TMPGenc's frequency rate converter is just very bad and will often introduce a metallic sound whenever converting frequencies.

There is no need to demux or to even use a separate standalone program.

Get ssrc.exe (shibatch encoder.) It is widely considered the best compromise between quality and speed for converting frequencies. In TMPGenc select Options/Environmental Settings/External tool and at the bottom under frequency rate converter point it to your ssrc.exe. Now when you encode in TMPGenc it will create a temp audio file and process it in ssrc to do your downsample from 48kHz to 44100kHz and I can assure you that the metallic effect will be gone.

In this same tab select Layer 2 and point it to your toolame.exe. This will work in the same way as ssrc. I highly recommend that if you use TMPGenc for encoding you use both of these two external tools from within TMPGenc. It bypasses all of TMPGenc's problems and generally low quality regarding audio encoding.

[secretagent]

open your avi in virtual dub. then go to audio. put audio in full processing mode then click on audio conversion set rate to whatever you like. save as wav. takes 3 minutes for a whole movie. use new wave in tmpeg as audio source. your troubles are over

[Bel]

I'm a fan of dbpoweramp myself (also freeware), but yes it pretty much happens with any audio frequency conversion in TMPG, unless you use an external audio encoder as Adam suggested.