sipeed / sipeed/MaixPy

Converting Maxi Image classes from between FMT_YVU420SP and FMT_RGB888 (RTMP + Yolo)

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Description

I've been trying to optimize performance of a camera. I'm only streaming over RTMP once a particular object is detected from Yolo11. The only working way to do this - from what I can tell so far - is to have two Camera Objects open.

ex:
detector = nn.YOLO11(model="/root/models/yolo11n.mud", dual_buff=True)
cam_yolo = camera.Camera(width,height,detector.input_format())
cam = camera.Camera(width,height,image.Format.FMT_YVU420SP)

Using this method removes a frame from the buffer whenever you call ".read()". Ideally, I'd have just the "cam" camera object and simply convert the returned image. This wouldn't result in a dropped frame the RTMP stream.

Is there a way to convert from the FMT_YVU420SP to the FMT_RGB888 color spaces, or vice versa?

Thanks!

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  3. Fork the repository and make your change on a branch.
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Research direction

Start by tracing the camera.Camera.read() path and the image.Format definitions for FMT_YVU420SP and FMT_RGB888. Check how the detector input format and RTMP streaming consume frames; done means one camera object can convert between these formats without dropping the frame needed by the stream.

Written by the indexing model from the issue text.

Assessment

Tech stack
python
Domain
computer-vision, embedded-iot
Issue type
Feature
Difficulty
4/5
Estimated time
3-5 days
Activity status
Quiet
Clarity
Mostly clear
Newbie friendliness
48/100

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