Strange audio noise when playing videos

General
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1

Hello,

I have a client that needs to play a few video clips for an upcoming broadcast. I have previously done this by throwing the clips on an SD card and then play them with a HyperDeck mini. This time I wanted to move the video playback to CasparCG as this would be much easier with the setup that we have for this broadcast.

The issue I have is with the audio on the clips. I’m getting a very small crackling noise throughout all the clips. I have tried encoding the clips with lots of different settings but the noise persists. This makes me think it’s a configuration problem with Caspar and not a problem with the videos or the encoding.

I’m running version 2.2.0 but I have also tried 2.0.7 and have the same problem. The output is through a Decklink 4K Extreme but the problem is still there when I try system audio and newtek-ndi.

I have attached a short recording from the mixer as it’s difficult to describe the noise in text.

Appreciate all the help I can get.
Thanks!

2

Is the Audio encoded with 48kHz sampling rate?

3

Yes all audio is encoded in 48kHZ. I have done some tests with 44.1kHZ but most for the most part have I used 48k

4

I’ve experienced this a lot with BMD driver’s. Not saying it is related as you mention you’ve tried it through different audio devices… but they are frustrating drivers.

5

Try setting your volume down to 0.9 or 0.8. did the job for me with some distortions. 44khz or 48 khz should not matter anyway…

7

This is basically distortion that happens when you change or alter the frequency to something different hz.