Always modulated sound Handling sample rate and 32 bit audio, Fix?

Milosz-Nasadowski wrote on 2/16/2025, 1:59 PM

I sometimes do videos about birds for Youtube, sometimes presenting their sounds.

With birds having significant high pitch with modulation sound.
Now, I guess with normal voice or songs it's not noticed by the community of editors but when importing bird songs the sound in Vegas becomes strangely modulated/distorted.

I pin it down to how Vegas handles and converts bit depth. WHen I convert the sound to 44.1kHz 24bit in Adobe Audition the sounds are true as they should be.

Is this a problem for anyone? Is Vegas planning on fixing it?

Changing settings in Vegas doe snot help as any unmatching between the set sample rate in Vegas and the audio file ends up distorted. I changed settings to different and then the existing audio clips in my project started sounding veird.

Just so you get the idea I talk about sounding something like this:

 

Comments

bvideo wrote on 2/16/2025, 11:19 PM

That sounds like "aliasing." It happens when high frequency sounds are not filtered out during digitizing or in converting from a high sample rate to a lower sample rate.

It could tranform very high, possibly inaudible, frequencies into lower, uglier ones as in your sample.

Now: to identify the faulty transform. Maybe you can describe the original file, a la Mediainfo. Do you have software that can analyze and report a frequency distribution from your original recording? What software is doing your conversions?

Milosz-Nasadowski wrote on 2/17/2025, 2:59 AM

Thank you for the answer.

Yes, I am not at my PC but I know the original downloaded files are recorded/set to high settings 48kHz and 48bit while default in Vegas in my project is I think 44.1kHz and 16bit, but now I think its the sample rate.

This does not happen in any other editing programs I have access to so this is something Vegas needs addressing.

RogerS wrote on 2/17/2025, 6:22 AM

I haven't seen other reports of this. Could you share a sample source media, project settings and render audio settings so we can figure out where things are going wrong?

AAC might benefit from higher bitrates if that's what you rendering to.

DMT3 wrote on 2/17/2025, 7:45 AM

Audio for video is normally 48khz. Why not change your project to that setting?

john_dennis wrote on 2/17/2025, 12:30 PM

I used Shutter Encoder to download your audio file from Youtube as a 48kHz, 16 bit WAV file.

Complete name                            : C:\Users\John\Desktop\Willow_Tit_Bird_Sound.wav
Format                                   : Wave
Format settings                          : PcmWaveformat
File size                                : 1.31 MiB
Duration                                 : 7 s 129 ms
Overall bit rate mode                    : Constant
Overall bit rate                         : 1 536 kb/s
Writing application                      : Lavf61.9.100

Audio
Format                                   : PCM
Format settings                          : Little / Signed
Codec ID                                 : 1
Duration                                 : 7 s 129 ms
Bit rate mode                            : Constant
Bit rate                                 : 1 536 kb/s
Channel(s)                               : 2 channels
Sampling rate                            : 48.0 kHz
Bit depth                                : 16 bits
Stream size                              : 1.31 MiB (100%)

Sound Forge finds clipping in the file as uploaded and converted twice (at least). We are not going to be very accurate in our assessment without access to an original 32-bit source file.

Which field recorder did you use to record the audio?

john_dennis wrote on 2/18/2025, 12:40 AM

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