Question / Help Audio 'crackling/popping' when turning on stream.

[smoothmaydie]

Hello,

I've encountered an issue where I'll be listening to music just fine before streaming, but when turning on the preview stream/start stream the audio begins to 'crackle' and 'pop'. I'm pretty sure this is an issue on my end, since my viewers can't hear it. But its quite annoying and I'm not sure -why- its happening. All my audio drivers are up to date, both sound frequencies in my Windows OS and OBS match up (44.1k). Any help on this issue would be appreciated.

Here is my log file.

Spoiler

10:11:25: Open Broadcaster Software v0.571b - 64bit (　^ω^)
10:11:25: -------------------------------
10:11:25: CPU Name: Intel(R) Core(TM) i7-4770K CPU @ 3.50GHz
10:11:25: CPU Speed: 3491MHz
10:11:25: Physical Memory: 8079MB Total, 5746MB Free
10:11:25: stepping id: 3, model 12, family 6, type 0, extmodel 1, extfamily 0, HTT 1, logical cores 8, total cores 4
10:11:25: monitor 1: pos={-1920, 0}, size={1920, 1080}
10:11:25: monitor 2: pos={0, 0}, size={1920, 1080}
10:11:25: Windows Version: 6.1 Build 7601 S
10:11:25: Aero is Disabled
10:11:25: -------------------------------
10:11:25: OBS Modules:
10:11:25: Base Address Module
10:11:25: 000000003F820000 OBS.exe
10:11:25: 00000000E6960000 OBSApi.dll
10:11:25: 00000000F4D10000 DShowPlugin.dll
10:11:25: 00000000F4AD0000 GraphicsCapture.dll
10:11:25: 00000000F4AB0000 NoiseGate.dll
10:11:25: 00000000F49D0000 PSVPlugin.dll
10:11:25: 00000000E96A0000 scenesw.dll
10:11:25: ------------------------------------------
10:11:25: Adapter 1
10:11:25: Video Adapter: NVIDIA GeForce GTX 770
10:11:25: Video Adapter Dedicated Video Memory: 2087387136
10:11:25: Video Adapter Shared System Memory: 2147807232
10:11:25: ------------------------------------------
10:11:25: Adapter 2
10:11:25: Video Adapter: Intel(R) HD Graphics 4600
10:11:25: Video Adapter Dedicated Video Memory: 67108864
10:11:25: Video Adapter Shared System Memory: 1711276032
10:11:25: =====Stream Start: 2013-10-15, 10:11:25===============================================
10:11:25: Multithreaded optimizations: On
10:11:25: Base resolution: 1920x1080
10:11:25: Output resolution: 1280x720
10:11:25: ------------------------------------------
10:11:25: Loading up D3D10 on NVIDIA GeForce GTX 770...
10:11:25: ------------------------------------------
10:11:25: Audio Format: 44100hz
10:11:25: Playback device Default
10:11:25: ------------------------------------------
10:11:25: Using desktop audio input: Line (M-Audio FastTrack)
10:11:25: ------------------------------------------
10:11:25: Audio Encoding: AAC
10:11:25: bitrate: 128
10:11:25: Using bitmap image
10:11:25: Using text output
10:11:25: ------------------------------------------
10:11:25: device: Logitech HD Pro Webcam C920,
10:11:25: device id \\?\usb#vid_046d&pid_082d&mi_00#7&24f42a7c&0&0000#{65e8773d-8f56-11d0-a3b9-00a0c9223196}\{bbefb6c7-2fc4-4139-bb8b-a58bba724083},
10:11:25: chosen type: I420, usingFourCC: false, res: 1920x1080 - 1920x1080, frameIntervals: 333333-2000000, fourCC: 'I420'
10:11:25: audio device: Disable,
10:11:25: audio device id Disabled,
10:11:25:
10:11:25: Using directshow input
10:11:25: Using graphics capture
10:11:25: ------------------------------------------
10:11:25: Video Encoding: x264
10:11:25: fps: 60
10:11:25: width: 1280, height: 720
10:11:25: preset: veryfast
10:11:25: profile: high
10:11:25: keyint: 120
10:11:25: CBR: yes
10:11:25: CFR: no
10:11:25: max bitrate: 3500
10:11:25: buffer size: 3500
10:11:25: ------------------------------------------
10:11:25: MMDeviceAudioSource: Frequency for device 'Line (M-Audio FastTrack)' is 352800, samples per sec is 44100
10:11:37: Total frames encoded: 649, total frames duplicated: 1 (0.15%)
10:11:37: Total frames rendered: 658, number of late frames: 0 (0.00%) (it's okay for some frames to be late)
10:11:37:
10:11:37: Profiler time results:
10:11:37:
10:11:37: ==============================================================
10:11:37: video thread frame - [100%] [avg time: 0.83 ms] [children: 51.1%] [unaccounted: 48.9%]
10:11:37: | scene->Preprocess - [51.1%] [avg time: 0.424 ms]
10:11:37: GPU download and conversion - [100%] [avg time: 0.103 ms] [children: 79.6%] [unaccounted: 20.4%]
10:11:37: | flush - [65%] [avg time: 0.067 ms]
10:11:37: | CopyResource - [11.7%] [avg time: 0.012 ms]
10:11:37: | conversion to 4:2:0 - [2.91%] [avg time: 0.003 ms]
10:11:37: Convert444Threads - [100%] [avg time: 0.49 ms] [children: 99.4%] [unaccounted: 0.612%]
10:11:37: | Convert444toNV12 - [99.4%] [avg time: 0.487 ms]
10:11:37: encoder thread frame - [100%] [avg time: 0.656 ms]
10:11:37: ==============================================================
10:11:37:
10:11:37:
10:11:37: Profiler CPU results:
10:11:37:
10:11:37: ==============================================================
10:11:37: video thread frame - [cpu time: avg 0.474 ms, total 312.002 ms] [avg calls per frame: 1]
10:11:37: | scene->Preprocess - [cpu time: avg 0.189 ms, total 124.801 ms] [avg calls per frame: 1]
10:11:37: GPU download and conversion - [cpu time: avg 0 ms, total 0 ms] [avg calls per frame: 1]
10:11:37: | flush - [cpu time: avg 0 ms, total 0 ms] [avg calls per frame: 1]
10:11:37: | CopyResource - [cpu time: avg 0 ms, total 0 ms] [avg calls per frame: 1]
10:11:37: | conversion to 4:2:0 - [cpu time: avg 0 ms, total 0 ms] [avg calls per frame: 1]
10:11:37: Convert444Threads - [cpu time: avg 0.273 ms, total 343.201 ms] [avg calls per frame: 2]
10:11:37: | Convert444toNV12 - [cpu time: avg 0.273 ms, total 343.201 ms] [avg calls per frame: 2]
10:11:37: encoder thread frame - [cpu time: avg 0.049 ms, total 31.2 ms] [avg calls per frame: 1]
10:11:37: ==============================================================
10:11:37:
10:11:37: =====Stream End: 2013-10-15, 10:11:37=================================================

 

[dodgepong]

Try opening your webcam capture source, checking "Custom Resolution" and lowering it to something lower than 1080p.

 

[smoothmaydie]

Try opening your webcam capture source, checking "Custom Resolution" and lowering it to something lower than 1080p.

Odd, that seemed to work. I set it to 720p instead and the crackling -seems- to have stopped.

Why is that? Would putting the webcam into a USB 3.0 enable me to put it to 1080p still? Not that it matters, 720p looks fantastic since its not full screened anyways. Just curious.

 

[dodgepong]

You could always try a USB 3.0 port, it can't hurt. I'm not exactly certain why this happens, but I have heard of that problem a lot with that webcam in OBS, and lowering the resolution always fixes it. Setting your webcam at a higher resolution than necessary puts extra strain on the CPU, so it's not a good idea anyway. If the webcam is only supposed to be in a little section of the screen, you should use the resolution that most closely matches the size of the screen it will take up.

 

[MattR]

OMG Thank you for this thread.

I've been having popping in my audio/VODs and changing the resolution of the camera to below 1080p fixed it!

THANK YOU!