Audio glitches/cutouts in recording

[HWesterhof]

Hi all,

I use OBS Studio to record a session, the end product is a video file that I can upload to YouTube.

However, occasionally I notice audio cut outs of a few milliseconds. I've literally spent weeks trying figure out this issue. So far I've only been able to narrow things down. It usually happens within 2 to 5 minutes. Sometimes 10 minutes without issue, sometimes within 30 seconds...

It is only happening in OBS Studio. I've recorded several sessions using Audacity without any problem.

What I've tried:

• Official Scarlett Focusrite drivers (v3.18.0)
• Legacy Scarlett Focusrite drivers (v3.6.0)
• Windows driver (Scarlett 2i2 USB)

(I fully uninstalled all existing drivers when I switched to another driver)

• I tried all combinations imaginable regarding buffer size (ranging from 64 to 1024), frequencies (44100 Hz,48000 Hz), and formats (24 bit, 16 bit)
• Followed steps regarding DPC latency (https://support.focusrite.com/hc/en-gb/articles/208360865-Troubleshooting-DPC-latency)
• Recording settings to the bare minimum: 1080p, 30 FPS (https://obsproject.com/logs/ULpkJLBjjcFnIl1C)

OBS related attempts:

• Latest release (30.2.3)
• Beta release (31.0.0 Beta 1)
• Tried ASIO plugin (to work with ASIO USB Focusrite in OBS)
• Uninstalled all plugins
• Reproducible with a recording with just one source, being the input of the Focusrite (so zero other stuff going on, black screen)
• Recording locations: Ranging from external USB drive, and tried both my internal SSD's (one SATA, other NVME)
• Tried video/audio encoders
• Tried custom FFMpeg encoder (https://obsproject.com/tools/analyzer?log_url=https://obsproject.com/logs/mMiWXtE69gHeYn2k)
• Log analysis using the standard encoder (https://obsproject.com/tools/analyzer?log_url=https://obsproject.com/logs/YwkP1UYyTNUQZbP0)

My relevant hardware specifications:

• Scarlett Focusrite 2i2 3rd gen, using the input left and right into OBS as audio
• NVIDIA RTX 4070 Ti
• AMD Ryzen 9 5900X 12 core
• 32 GB RAM

Example waveform of audio cut out

I'm really out of options here :( Hopefully someone can provide me the golden tip!

 

[HWesterhof]

Oh another addition, I just uninstalled OBS, deleted everything related to OBS, and installed version 29.1.3, with the legacy Focusrite drivers: Same issue in first recording, within 2 minutes.

 

[Thebigcheese]

Try this: https://github.com/norihiro/obs-async-audio-filter

 

[HWesterhof]

Try this: https://github.com/norihiro/obs-async-audio-filter

This actually worked.... THANK YOU!!

 

[Thebigcheese]

No problem! It's a known issue, though some people here refuse to acknowledge it. Hopefully one day they will get it pulled into a release.

 

[rockbottom]

That's just a bandaid/workaround.

Your log is incomplete but this can be better.

16:30:04.988: Source ID 'spout_capture' not found
16:30:04.988: Failed to create source 'Spout2 Capture'!
16:30:04.988: Source ID 'shader_filter' not found
16:30:04.988: Failed to create source 'User-defined shader'!
16:30:04.988: Source ID 'phandasm_waveform_source' not found
16:30:04.988: Failed to create source 'Waveform Visualizer 3 2'!
16:30:04.988: Source ID 'shader_filter' not found
16:30:04.988: Failed to create source 'User-defined shader'!
16:30:04.989: Source ID 'shader_filter' not found
16:30:04.989: Failed to create source 'User-defined shader'!
16:30:04.989: Source ID 'phandasm_waveform_source' not found
16:30:04.989: Failed to create source 'Spectralizer Bottom'!
16:30:04.990: [win-wasapi: 'Focusrite'] update settings:
16:30:04.990: device id: {0.0.1.00000000}.{a1bc6f09-ba4a-47e5-936f-5be1bf04c0aa}
16:30:04.990: use device timing: 1
16:30:04.990: Source ID 'shader_filter' not found
16:30:04.990: Failed to create source 'User-defined shader'!

16:31:46.013: [obs-nvenc] init_encoder_hevc: nv.nvEncInitializeEncoder(enc->session, &enc->params) failed: 8 (NV_ENC_ERR_INVALID_PARAM): Adaptive quantization is not supported with lossless encoding
16:31:46.013:
16:31:46.013: [obs-nvenc] init_specific_encoder failed, trying again with compatibility options

16:30:04.995: Loaded scenes:
16:30:04.995: - scene 'Record Music Video Clip (4K)':
16:30:04.995: - source: 'Focusrite' (wasapi_input_capture)
16:30:04.995: - filter: 'Noise Gate' (noise_gate_filter)
16:30:04.995: - source: 'Sony cam' (dshow_input)
16:30:04.995: - scene 'Record Music Video Clip (1440p)':
16:30:04.995: - source: 'Spout2 Capture' (spout_capture)
16:30:04.995: - filter: 'Render Delay' (gpu_delay)
16:30:04.995: - filter: 'User-defined shader' (shader_filter)
16:30:04.995: - source: 'Waveform Visualizer 3 2' (phandasm_waveform_source)
16:30:04.995: - filter: 'User-defined shader' (shader_filter)
16:30:04.995: - source: 'PulzWave logo test 2' (text_gdiplus_v3)
16:30:04.995: - filter: 'User-defined shader' (shader_filter)
16:30:04.995: - source: 'PulzWave' (group)
16:30:04.995: - filter: 'User-defined shader' (shader_filter)
16:30:04.995: - source: 'Chroma Group' (group)
16:30:04.995: - filter: 'Morning Chroma Key' (chroma_key_filter_v2)
16:30:04.995: - filter: 'Evening Chroma Key' (chroma_key_filter_v2)
16:30:04.995: - source: 'Sony cam' (dshow_input)
16:30:04.995: - source: 'Chroma Mask' (group)
16:30:04.995: - filter: 'Image Mask/Blend' (mask_filter_v2)
16:30:04.995: - filter: 'Render Delay' (gpu_delay)
16:30:04.995: - source: 'Sony cam' (dshow_input)
16:30:04.995: - source: 'Spectralizer Bottom' (phandasm_waveform_source)

 

[rockbottom]

I may be worthless soon. Rotator cuff surgery this morning, nerve block is wearing off so I had to pop some percs. Doc said to load up on the pain meds for the next few days.