640x480 on RPI3B+ FPS can't be over 6.5, performance degraded

[lida2003]

Current code on my RPI3B+ bookwrom system, FPS can't be more over 6.5.

Release date: July 4th 2024
System: 64-bit
Kernel version: 6.6
Debian version: 12 (bookworm)

The performance is significantly degraded, any way to boost?

[lida2003]

I just used python code for test, which is much better.CPU is 300%, and it reached 22 FPS with software encoding.

As I'm 64bit bookworn OS. It might be the same as Pi4, which do not have hardware encorder "libOMX_Core.so".

import socket
import subprocess
import numpy as np
import picamera2
import time
import cv2  # Import OpenCV module

# Set up RTP streaming
rtp_host = "192.168.1.19"
rtp_port = 5400
sock = socket.socket(socket.AF_INET, socket.SOCK_DGRAM)

# Use ffmpeg to encode video with specified profile and level
ffmpeg_command = [
    'ffmpeg',
    '-f', 'rawvideo',
    '-pix_fmt', 'yuv420p',  # Change to YUV 4:2:0 pixel format
    '-s', '640x480',  # Frame size
    '-r', '30',  # Frame rate
    '-i', '-',  # Input from stdin
    '-c:v', 'libx264',  # Use H.264 codec
    '-profile:v', 'baseline',  # Set profile to baseline
    '-level', '5.0',  # Set level to 5
    '-f', 'rtp',  # Output format
    f'rtp://{rtp_host}:{rtp_port}'
]

process = subprocess.Popen(ffmpeg_command, stdin=subprocess.PIPE)

camera = picamera2.Picamera2()
camera.configure(camera.create_video_configuration(main={"size": (640, 480)}))
camera.start()

try:
    while True:
        frame = camera.capture_array()
        # Convert frame to YUV 4:2:0
        frame_yuv = cv2.cvtColor(frame, cv2.COLOR_BGR2YUV_I420)
        process.stdin.write(frame_yuv.tobytes())  # Send the frame to ffmpeg
        time.sleep(0.033)  # Sleep for ~30 FPS
except KeyboardInterrupt:
    pass
finally:
    camera.stop()
    process.terminate()
    sock.close()

[lida2003]

Tried 32bit bookworm, Not good!