TMPGEnc introducing noise into mpeg2

[simmons3d]

I'm using TMPGEnc to create s-vcd's and dvd-r suitable mpeg2's, and it seems to add a faint but annoying "hiss" to the audio that is not present on the .wav beforehand. Any ideas on TMPGEnc settings that may get rid of this? I even considered first converting the audio to 44100 from 48000 in cooledit.... I don't know if this would change anything. Thanks!

[poopyhead]

a couple of things you can try:

1) try extracting the highest bitrate audio you can, (i.e. 448 kbit vs. 192 kbit). i've had some problems with the latter.

2) yea...like u suggested, try downsampling. dvd2avi has its own downsampler, so you wouldn't need to have tmpgenc do it for u.

3) use external audio encoder like lame or besweet

4) also, it can just be the version of dvd2avi you're using. try downloading the latest version. i've also encountered hissing noises and getting the latest version of dvd2avi fixed it.

[simmons3d]

Thanks! Does tmpgenc really downsample audio from 48000 to 44100?

[poopyhead]

if you don't downsample in dvd2avi, the wav file created will be 48 khz. in tmpgenc, you prolly set the audio output as 44.1 khz. hence, tmpgenc downsamples for you. you should downsample to achieve maximum compatibility with standalone dvd players, though i hear some dvd players can handle 48 khz audio

[Donny661]

i've gotten that same hissing noise before even if I used 48khz audio. I'd say the best thing to do use tooLame to encode your audio and downsample with either dvd2avi at the high setting, ssrc (sampling rate converter program), or tooLame can do it. Best way would be ssrc; don't have tmpg do it. When you downsample you have less samples that the encoder has to use up data on, therefore each sample will have more bits to describe it and hopefully it will sound better when you're using low datarates or a not so great compression codec (i.e. mpeg layer 2). It's kind of like with video, if you have a high resolution clip with lower datarates or a worse compression codec, the lower resolution clip would look better. Sound files are generally better sounding if the sampling frequency is higher but it also needs higher datarates to make it better.

[poopyhead]

i've gotten that same hissing noise before even if I used 48khz audio. I'd say the best thing to do use tooLame to encode your audio and downsample with either dvd2avi at the high setting, ssrc (sampling rate converter program), or tooLame can do it. Best way would be ssrc; don't have tmpg do it.

not necessarily..... dvd2avi can have a big effect on the hissing noise. i had this happen recently with hot shots! part deux. i downsampled using dvd2avi's highest setting and used lame....the hissing actually got worse. it turns out that it was dvd2avi's problem. i downloaded the latest version of dvd2avi and did NOT downsample in dvd2avi, but rather let tmpgenc do it. the audio was fine.