Force lower framerate on VideoEncoder

ChristianN

I'm using the VideoEncoder to record mp4s to my host machine. I was using still images, but my scene is relatively static and thus I can get much better compression using video formats. But I really don't need that high of density, maybe just 5-10 fps max.

However, using all the VideoEncoder library methods, I cannot lower the frame rate below 30 at all. The setFramerate method does nothing, as mentioned in this thread here. So I tried forcing the bitRate down, and this works by lowering the image quality, but not the framerate! Is there no way to just force a lower framerate to save less data on host? I really can't exceed 500 KB / sec on my host, but I still want relatively high quality images.

Any suggestions?

jakaskerl

Hi @ChristianN
videoEncoder.setDefaultProfilePreset(cam.getFps(), dai.VideoEncoderProperties.Profile.H265_MAIN) should work AFAIK. What about just lowering the camRgb fps?

Thanks,
Jaka

ChristianN

Hey @jakaskerl , thanks for the reply

I started by setting a lower frame rate using setDefaultProfilePreset, but it did not actually change anything. This led me to try the setFps function, but again no change. That led me to the thread I posted (this one) where another use reported the same behavior. The conclusion on the thread was that setting the fps does not change behavior. I would love for this to be wrong.

To your second question, how would I "lower the camRgb fps"? Do you mean use the static image API to lower the fps? Will that configuration transfer over to the videoencoder? I assume the camera does not share properties across configurations.

ChristianN

Clarification: I see now that the videoEncoder is a separate post processing node on the ColorCamera node, which you can also call setFps. I'm trying that now to see if that works. Thanks!

ChristianN

YES that worked. Thank you for the tip. I'm not sure why those setters exist on the VideoEncoder node if they don't actually control the frame rate, but you can use that feedback how you like. Glad to know it's at least possible 🙂