I have a same problem!
Log:
09:33:58.330: CPU Name: Intel(R) Core(TM) i5-3210M CPU @ 2.50GHz
09:33:58.330: CPU Speed: 2500MHz
09:33:58.331: Physical Cores: 2, Logical Cores: 4
09:33:58.331: Physical Memory: 16384MB Total
09:33:58.331: OS Name: Mac OS X (NSMACHOperatingSystem)
09:33:58.331: OS Version: Version 10.9.5 (Build 13F1911)
09:33:58.331: Kernel Version: 13.4.0
09:33:58.333: hotkeys-cocoa: Using layout 'com.apple.keylayout.US'
09:33:58.333: Portable mode: false
09:33:58.520: OBS 19.0.3 (mac)
09:33:58.520: ---------------------------------
09:33:58.521: ---------------------------------
09:33:58.521: audio settings reset:
09:33:58.521: samples per sec: 44100
09:33:58.521: speakers: 2
09:33:58.522: ---------------------------------
09:33:58.522: Initializing OpenGL...
09:33:58.544: OpenGL version: 4.1 INTEL-8.28.37
09:33:58.629: ---------------------------------
09:33:58.629: video settings reset:
09:33:58.629: base resolution: 1280x800
09:33:58.629: output resolution: 1024x640
09:33:58.629: downscale filter: Bicubic
09:33:58.629: fps: 30/1
09:33:58.629: format: NV12
09:33:58.629: Audio monitoring device:
09:33:58.629: name: По умолчанию
09:33:58.629: id: default
09:33:58.629: ---------------------------------
09:33:59.167: No blackmagic support
09:33:59.182: [VideoToolbox encoder]: Adding VideoToolbox H264 encoders
09:33:59.201: VLC found, VLC video source enabled
09:33:59.203: Failed to load 'en-US' text for module: 'obs-browser.so'
09:33:59.203: [browser_source: 'Version: 1.29.0']
09:33:59.204: ---------------------------------
09:33:59.204: Loaded Modules:
09:33:59.204: obs-browser.so
09:33:59.204: vlc-video.so
09:33:59.204: text-freetype2.so
09:33:59.204: rtmp-services.so
09:33:59.204: obs-x264.so
09:33:59.204: obs-vst.so
09:33:59.204: obs-transitions.so
09:33:59.204: obs-outputs.so
09:33:59.204: obs-filters.so
09:33:59.204: obs-ffmpeg.so
09:33:59.204: mac-vth264.so
09:33:59.204: mac-syphon.so
09:33:59.204: mac-decklink.so
09:33:59.204: mac-capture.so
09:33:59.204: mac-avcapture.so
09:33:59.204: linux-jack.so
09:33:59.204: image-source.so
09:33:59.204: frontend-tools.so
09:33:59.204: coreaudio-encoder.so
09:33:59.204: ==== Startup complete ===============================================
09:33:59.267: Service '' not found
09:33:59.275: All scene data cleared
09:33:59.275: ------------------------------------------------
09:33:59.309: coreaudio: device 'Built-in Microphone' initialized
09:33:59.309: Switched to scene 'Сцена'
09:33:59.309: ------------------------------------------------
09:33:59.309: Loaded scenes:
09:33:59.310: - scene 'Сцена':
09:33:59.310: ------------------------------------------------
09:33:59.343: adding 46 milliseconds of audio buffering, total audio buffering is now 46 milliseconds
09:34:43.170: rtmp-common.c: [initialize_output] Could not find service ''
09:34:43.171: rtmp-common.c: [initialize_output] Could not find service ''
09:34:43.204: rtmp-common.c: [initialize_output] Could not find service ''
09:34:44.004: rtmp-common.c: [initialize_output] Could not find service ''
09:34:50.088: rtmp-common.c: [initialize_output] Could not find service ''
09:34:50.815: rtmp-common.c: [initialize_output] Could not find service ''
09:34:51.982: rtmp-common.c: [initialize_output] Could not find service ''
09:34:56.376: rtmp-common.c: [initialize_output] Could not find service ''
09:34:59.937: rtmp-common.c: [initialize_output] Could not find service ''
09:35:02.457: rtmp-common.c: [initialize_output] Could not find service ''
09:35:04.822: rtmp-common.c: [initialize_output] Could not find service ''
09:35:28.213: ==== Shutting down ==================================================
09:35:28.216: Switched to scene '(null)'
09:35:28.247: All scene data cleared
09:35:28.247: ------------------------------------------------
09:35:28.319: Freeing OBS context data
09:35:28.337: == Profiler Results =============================
09:35:28.337: run_program_init: 1272.03 ms
09:35:28.337: ┣OBSApp::AppInit: 4.781 ms
09:35:28.337: ┃ ┗OBSApp::InitLocale: 2.51 ms
09:35:28.337: ┗OBSApp::OBSInit: 1127.92 ms
09:35:28.337: ┣obs_startup: 2.802 ms
09:35:28.337: ┗OBSBasic::OBSInit: 902.843 ms
09:35:28.337: ┣OBSBasic::InitBasicConfig: 0.381 ms
09:35:28.337: ┣OBSBasic::ResetAudio: 0.111 ms
09:35:28.337: ┣OBSBasic::ResetVideo: 107.899 ms
09:35:28.337: ┣OBSBasic::InitOBSCallbacks: 0.006 ms
09:35:28.337: ┣OBSBasic::InitHotkeys: 0.061 ms
09:35:28.337: ┣obs_load_all_modules: 574.509 ms
09:35:28.337: ┃ ┣obs_init_module(coreaudio-encoder.so): 0.011 ms
09:35:28.337: ┃ ┣obs_init_module(frontend-tools.so): 2.813 ms
09:35:28.337: ┃ ┣obs_init_module(image-source.so): 0.005 ms
09:35:28.337: ┃ ┣obs_init_module(linux-jack.so): 0.003 ms
09:35:28.337: ┃ ┣obs_init_module(mac-avcapture.so): 500.647 ms
09:35:28.337: ┃ ┣obs_init_module(mac-capture.so): 0.008 ms
09:35:28.337: ┃ ┣obs_init_module(mac-decklink.so): 0.102 ms
09:35:28.337: ┃ ┣obs_init_module(mac-syphon.so): 0.004 ms
09:35:28.337: ┃ ┣obs_init_module(mac-vth264.so): 11.284 ms
09:35:28.337: ┃ ┣obs_init_module(obs-ffmpeg.so): 0.122 ms
09:35:28.337: ┃ ┣obs_init_module(obs-filters.so): 0.014 ms
09:35:28.338: ┃ ┣obs_init_module(obs-outputs.so): 0.004 ms
09:35:28.338: ┃ ┣obs_init_module(obs-transitions.so): 0.011 ms
09:35:28.338: ┃ ┣obs_init_module(obs-vst.so): 0.005 ms
09:35:28.338: ┃ ┣obs_init_module(obs-x264.so): 0.004 ms
09:35:28.338: ┃ ┣obs_init_module(rtmp-services.so): 0.121 ms
09:35:28.338: ┃ ┣obs_init_module(text-freetype2.so): 0.013 ms
09:35:28.338: ┃ ┣obs_init_module(vlc-video.so): 0.477 ms
09:35:28.338: ┃ ┗obs_init_module(obs-browser.so): 0.719 ms
09:35:28.338: ┣OBSBasic::ResetOutputs: 62.494 ms
09:35:28.338: ┣OBSBasic::CreateHotkeys: 0.065 ms
09:35:28.338: ┣OBSBasic::InitService: 0.187 ms
09:35:28.338: ┣OBSBasic::InitPrimitives: 7.007 ms
09:35:28.338: ┗OBSBasic::Load: 35.479 ms
09:35:28.338: obs_hotkey_thread(25 ms): min=0.017 ms, median=0.04 ms, max=0.786 ms, 99th percentile=0.114 ms, 100% below 25 ms
09:35:28.338: audio_thread(Audio): min=0.011 ms, median=0.062 ms, max=0.326 ms, 99th percentile=0.147 ms
09:35:28.338: obs_video_thread(33.3333 ms): min=2.657 ms, median=19.264 ms, max=71.779 ms, 99th percentile=23.26 ms, 99.9628% below 33.333 ms
09:35:28.338: ┣tick_sources: min=0 ms, median=0.012 ms, max=0.125 ms, 99th percentile=0.049 ms
09:35:28.338: ┣render_displays: min=0.002 ms, median=0.894 ms, max=6.046 ms, 99th percentile=2.153 ms
09:35:28.338: ┗output_frame: min=2.652 ms, median=18.343 ms, max=71.771 ms, 99th percentile=21.963 ms
09:35:28.338: ┣gs_context(video->graphics): min=2.652 ms, median=18.17 ms, max=71.77 ms, 99th percentile=21.784 ms
09:35:28.338: ┃ ┣render_video: min=1.173 ms, median=18.147 ms, max=70.854 ms, 99th percentile=21.765 ms
09:35:28.338: ┃ ┃ ┣render_main_texture: min=0.016 ms, median=0.028 ms, max=1.159 ms, 99th percentile=0.055 ms
09:35:28.338: ┃ ┃ ┣render_output_texture: min=0.005 ms, median=0.064 ms, max=70.742 ms, 99th percentile=0.132 ms
09:35:28.338: ┃ ┃ ┣render_convert_texture: min=0.001 ms, median=0.088 ms, max=8.312 ms, 99th percentile=0.185 ms
09:35:28.338: ┃ ┃ ┗stage_output_texture: min=0 ms, median=17.959 ms, max=27.927 ms, 99th percentile=21.524 ms
09:35:28.338: ┃ ┣download_frame: min=0 ms, median=0.005 ms, max=0.053 ms, 99th percentile=0.007 ms
09:35:28.338: ┃ ┗gs_flush: min=0 ms, median=0 ms, max=1.472 ms, 99th percentile=0.001 ms
09:35:28.338: ┗output_video_data: min=0.127 ms, median=0.165 ms, max=0.745 ms, 99th percentile=0.273 ms
09:35:28.338: video_thread(video): min=0.001 ms, median=0.001 ms, max=0.03 ms, 99th percentile=0.002 ms
09:35:28.338: =================================================
09:35:28.338: == Profiler Time Between Calls ==================
09:35:28.338: obs_hotkey_thread(25 ms): min=25.049 ms, median=25.731 ms, max=31.595 ms, 38.2109% within ±2% of 25 ms (0% lower, 61.7891% higher)
09:35:28.338: obs_video_thread(33.3333 ms): min=29.16 ms, median=33.332 ms, max=71.791 ms, 77.2693% within ±2% of 33.333 ms (10.7143% lower, 12.0164% higher)
09:35:28.338: =================================================
09:35:28.363: Number of memory leaks: 0