ffmpeg doesnot make use of CPU and result in poor performance

[irous]

I'm trying to capture video from webcam. I tried with codec libx264 and rawvideo but both result in slow speed (about 0.5).
I'm using Windows 10, intel core i5, 8gb ram. download ffmpeg from: https://www.gyan.dev/ffmpeg/builds/
I use this command:

ffmpeg ^
  -f dshow -r 5 -s 640x480 -i video="Sony Visual Communication Camera" ^
  -f rawvideo output.raw

output:

[Attachment 66797 - Click to enlarge]

task manager: cpu, ram, disk basically low.

If I try recoding with command above and change fps to 30: "-r 30" . the result is: fps 7.9, speed 0.261. cpu usage is still low about 0.1%.

But I can easily record 30fps webcam using Directshow GraphEdit:

[Attachment 66798 - Click to enlarge]

So my question is why does ffmpeg produce such poor performance even with 5 fps? Any help is appreciated.

[october262]

I'm trying to capture video from webcam. I tried with codec libx264 and rawvideo but both result in slow speed (about 0.5).
I'm using Windows 10, intel core i5, 8gb ram. download ffmpeg from: https://www.gyan.dev/ffmpeg/builds/
I use this command:

ffmpeg ^
  -f dshow -r 5 -s 640x480 -i video="Sony Visual Communication Camera" ^
  -f rawvideo output.raw

output:

[Attachment 66797 - Click to enlarge]

task manager: cpu, ram, disk basically low.

If I try recoding with command above and change fps to 30: "-r 30" . the result is: fps 7.9, speed 0.261. cpu usage is still low about 0.1%.

But I can easily record 30fps webcam using Directshow GraphEdit:

[Attachment 66798 - Click to enlarge]

So my question is why does ffmpeg produce such poor performance even with 5 fps? Any help is appreciated.

try ffmpeg -f dshow -s 640x480 -r 30 see here - https://www.bogotobogo.com/VideoStreaming/ffmpeg_webcam_capture_Windows_Linux.php

[irous]

@october262 I believe I said trying with -r 30 in my first post. But unfortunately, it didn't work. the speed is around 0.3 and fps is 8.