Hissing audio after encoding with TMPGenc(svcd)

[Kalenkoss]

Hi everyone,
Here's my settings:(NTSC)
-SmartRipper(rip)
-DVD2AVI(frameserve)
*Forced Film
-TMPGenc(encode)
*Template: SVCD NTSC-FILM
*Non-Interlaced
*Field Order A
*Preserve Aspect Ratio
*2 PASS VBR
*Motion Search: High Quality(slow)
-Nero(Burn)

Now, the result is not bad at all, the video is superb but the sound is not quite good: some hissing problem heard mostly when actors speek or sharp music instrument played, good special effects sound though. I don't think the problem lies in DVD2AVI because there's no problem when i listen to the WAV file. It occurs when i playback the result from TMPGenc, even with the PC(WinDVD or WMP) or my standalone player(Pioneer 343), so i don't think it's a codec problem nor a standalone playback problem....
Anyone with a clue???
Thanks in advance
Kalenkoss

[bilbogod]

yeah, download toolame or scmpx and then click on the enviromental option setting in TMPGenc. Point it at Toolame.exe and you'll have your audio sounding much better. Also if your dvd player is capable of playing 48Khz vcds then don't bother with the downsampling stage.

[Kalenkoss]

Thanks for the advise, i'll try that! I'm not sure if my standalone support 48hz, but the problem is there to with WinDVD and WMP. I've not done downsampling though...
cya

[poopyhead]

could be the source....

dvds have higher and lower bitrate audio you can extract...if you hear hissing, you prolly extracted a lower bitrate (~192 kbit)...try selecting another track and extracting the higher quality one (~448 kbit)

[stanwebber]

if you're talking about dolby digital 2.0 & 5.1 audio, the pro-logic 2.0(typically 192kbps) is the track you want as all 4channels are already in a l+r stereo compatible format. dd 5.1 needs to be downmixed to pro-logic if you want to keep the surround sound so you gain nothing

[videoguy79]

With TMPGenc, that hissing sound you hear is the crappy downsampling algorithm that the program uses to go from 48000hz to 44100hz. The strange noises are caused by aliasing. If possible, just use 48Khz audio (I do it all the time since my standalone has no problem with it) or use Toolame to do the conversion and remux the audio/video when you are ready to burn the mpeg.

[Kalenkoss]

I think i've find a part of the problem, I tried the DVD2SVCD program and the result is much better. The program use BeSweet to convert the AC3 to MP2 and itself, use some other internal tools : azid, ssrc, wavbooster and toolame, i think. I still hear some low hissing, and it still not like the original, but the result is ok.
Another question: how important is the audio downmix, since my last DVD's don't have a 2 channel stereo track (only dd 5.1 & dts)? What's the best audio settings for converting dd 5.1? Stereo, Joint Stereo or Dual Channel?
Thanks

[stanwebber]

if you dont downmix you get no prologic surround. only stereo will preserve the surround sound channels intact

[videoguy79]

Glad to hear that things are working better for you with different software. Keep in mind that no matter what programs you use, the conversion from 48000hz to 44100 is mathematically difficult, so the sound will never be perfect, but good enough for VCD/SVCD. Case in point, the equiptment that professional musicians use to downsample 48Khz DAT recordings to 44.1Khz is expensive and does a much better job that most software downsampling algorthims I've run across. As far as what do do with a DD soundtrack, I usually select the English 5.1 stream and downmix to Dolby Surround, using stereo as my channel mode. Since Dolby Surround downmixes phase information to two channels, don't use joint stereo, since that destroys phase/steering signals and may result in damaged/no surround effect when decoded with Pro Logic/etc. Dual channel is two completely indepedent channels whose bits don't cross at all (good when using bitrates of 320kbps or highr), while in stereo mode, some bit swapping does occur, but not as often as in joint stereo.

[Kalenkoss]

Yeah, you're right. On the same clip, i've try 3 different settings and the best sound result came from the STEREO downmix mode(from a dd 5.1 track). I'll stick with this one, tks.

[Kalenkoss]

DAMN...the f... hissing sound is back...in fact, it never really left!!!!
I've try to use manually AZID; SSRC; Toolame etc.. and the results sucks...
After the DVD2AFI frameserving, the WAV file is perfect(in winamp)...but the problem is the conversion from WAV to MP2...
I tried downsampling, stereo mode, joint stereo, 224 kbps...etc...same result...it drive's me crazy!!!!!!!!!!!!!!

[Kalenkoss]

Back again...
Yep...the problem is the conversion WAV(orAC3) to MP2.....i tried WAV to MP3 and the sound was great!!!
All encoders out there seems to have the same problem(interal TMPGenc, BeSweet, etc...)
The hum(listen carefully...) is even there with a 320kbps transfer...ouch!!!
Someone with an answer?