FFMPEG Save stream frames to single image file (not sequence)

Is there a way to open a stream (usb webcam for example) and save each frame to the same image file?

That image would be later accessed as a simple resource from whichever protocol/service.

I tried this:

ffmpeg.exe -f dshow -i video="ASUS USB2.0 Webcam" image.png  

but it fails to write second frame. Error:

Could not get frame filename number 2 from pattern 'image.png'  

Sure, I can make a script to periodically starts ffmpeg and save only one frame, but that's a huge performance overhead.

https://stackoverflow.com/questions/66485751/ffmpeg-save-stream-frames-to-single-image-file-not-sequence March 05, 2021 at 10:08AM