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The inconsistent frame rate you’re experiencing with the USB camera could be due to several factors:
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USB Bandwidth and Latency: USB cameras can be affected by bandwidth limitations and latency, especially if other USB devices are connected to the same bus. This can cause fluctuations in frame rate.
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CPU Load: Since your loop is doing a bunch of other things, it’s possible that the CPU is being overloaded, which can affect the processing of video frames. The CSI camera might be less affected due to its direct connection to the SoC, which can handle data more efficiently.
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Driver and Kernel Version: Ensure that the UVC drivers are up-to-date and compatible with your kernel version. Sometimes, driver issues can cause performance inconsistencies.
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Power Management: Check if there are any power management settings that might be affecting the USB ports, causing them to throttle under certain conditions.
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OpenCV and Python Overhead: Python and OpenCV can introduce additional overhead compared to lower-level implementations. Consider optimizing your code or using a more efficient language for critical sections.
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GStreamer Pipeline: As mentioned in the context, using GStreamer might provide a more stable pipeline for video capture. You could try setting up a GStreamer pipeline to see if it offers more consistent performance.
You might want to monitor the system’s resource usage (CPU, memory, USB bandwidth) while running your application to identify any bottlenecks. Additionally, testing with a different USB port or reducing the load in your loop could help isolate the issue.
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