Hi

I'm working on a film project as a sound designer.
I keep getting the same problem after exporting the audio.

I'm attaching two images from Izotope RX with the issue.


Can anyone help me?

 

nice, nice, and what is your problem? what do you want to achieve, and what happened? what have you tried? c'mon, help others to help you!

 

Last edited: Dec 17, 2022

Cool, some noise and then a few ~1k and 2.7K tones with harmonics and some clicks.

If you are getting image B from A without processes then check your house for ghosts or your export settings. Outside of that, everything seems to be working as intended. Unless you have a specific question about something else.

 

Hi guys. Thanks for replying. Sorry if I wasn't that clear. I was really tired trying to sort this thing out.
So the problem is that these arfifacts that I'm highlighting in the image are created. The image without them is how the orginal sound is.

Thanks for your attention!

 

By what processes are these artefacts generated, did you change the settings to mitigate them? Were you trying to get rid of that scribble thing in your lowest pic? And most important: do you hear the artefacts, how?

I know RX sometimes produces weirdness, so, isn't there another method to accomplish what you want - like a simple cut?

 

Thanks for your answer. I didn't process the sound in RX. This is just for you guys to see. Yes they are audible. They are generated when I export the video in Davinci Resolve, but also in Premiere. I'm exporting aac as a codec. I have to do it aac because of the delivery demands. This is an academic project btw.

 

Are these generated or field recordings. They look like field recordings, a siren or something with a sweep on one channel and a whole lot of pink noise (wind maybe.)

The time code on those images doesn't even line up, but I doubt that would make much of a difference. We are still in mind reader territory though and this could be anything from working as intended to the source being over processed to attain an unrealistic goal with the tools available. Field recording is a difficult thing to pull off and sometimes you just have to deal with things not being as ideal as you would like them to be.

If you think it is a codec issue and you have no cliping, dynamic filters or harsh processors on the audio export mix at render you can always export the audio mixdown separately in a non lossy codec and convert to AAC in your editor or command line encoder of choice so that Resolve or Premier will leave your audio alone as far as lossy conversion goes and just join them in your container of choice afterwards.

I doubt it will make a difference but with the information given it will at least stop you from thinking that it is the render the NLE mixdown and packing is the issue.

Perceptual codecs are going to cause some loss in HF content and it might look like that but it shouldn't be so obvious that it becomes a problem.

Good luck.

 

maybe export audio in wav separately, to see if problem still exists. if not, re-enc it and mux it to video.

maybe youre trying to encode 24b/48k source audio into 16/48 project, and something in the template is wrong or missing.

just throwing ideas

 

Yes. These are field recordings. Thank you both for your answer. I'll try your solutions JMOUTTON. The time code doesn't line up but that doesn't make difference. It was just a way of showing you guys. It really became a problem, yes.
I think that might be the problem - 24b/48k to a 16/48, MdB. The thing is that I can't creat a 24b/48k project in Davinci, I think.
Thanks a lot guys

 

So these artefacts are created by the AAC export in both Resolve and Premiere, .wav exports are free of artefacts?
Like JMoutton suggested, try transcoding to AAC in another software (like RX) with various dither settings, then check again for artefacts.

For reconforming audio to picture I like to use the free 'Shutter Encoder' with its 'Replace Audio' function. Perfectly sync, you don't need a DAW for that. https://www.shutterencoder.com/en/

 

Exactly Boom operator.
I'll do that!
Thank you so much guys! Really appreciate your time and effort!