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DirectShow: How to capture audio and video - Stack Overflow
https://stackoverflow.com/questions/58300055/directshow-how-to-capture-audio-and-video#:~:text=ffmpeg%20-f%20dshow%20-i%20video%3D%22screen-capture-recorder%22%3Aaudio%3D%22virtual-audio-capturer%22%20-vcodec%20h264_nvenc%20output.mp4,press%20ctrl%20%2B%20c%20to%20stop%20the%20recording.
ffmpeg command line for capturing (and recording) audio ...
https://stackoverflow.com/questions/19212047/ffmpeg-command-line-for-capturing-and-recording-audio-and-video-in-720p-from-d
The option: video="Decklink Video Capture":audio="Decklink Audio Capture" tells ffmpeg to use those device as input, but by specifying them in this fashion, the lag between audio and video will be substantially less (and/or gone).-r 30 forces the output to be 30fps instead of the 60fps in source.-threads 4 does what you think, use 4 threads.
FFMPEG command line examples for audio-video capture ...
https://vijiboy.wordpress.com/2018/03/08/ffmpeg-command-line-examples-for-audio-video-capture/
[dshow @ 00000000005933c0] Pin “Capture” (alternative pin name “Capture”) [dshow @ 00000000005933c0] min ch=1 bits=8 rate= 11025 max ch=2 bits=16 rate= 44100. Last message repeated 22 times. audio=Microphone (HD Pro Webcam C920): Immediate exit requested. To record audio from the mic (without encoding):
FFmpeg Devices Documentation
https://ffmpeg.org/ffmpeg-devices.html
To use this an audio capture source has to be specified, but it can be anything even fake one. audio_device_save. Save the currently used audio capture filter device and its parameters (if the filter supports it) to a file. If a file with the same name exists it will be overwritten. ... $ ffmpeg -f dshow -i video="Camera":audio="Microphone"
How to record system sound with FFMPEG on Windows 10
https://www.addictivetips.com/windows-tips/record-system-sound-with-ffmpeg-on-windows-10/
ffmpeg -f dshow -i audio="Stereo Mix (Realtek Audio)" C:\Users\fatiw\Desktop\Audio\output.mp3. The recording will begin right away. You can minimize the Command Prompt window if you like but do not close it. When you want to stop the recording, return to the Command Prompt window and tap the Ctrl+C keyboard shortcut. Open the folder …
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