AttributeError: 'NoneType' object has no attribute 'shape' during write video output using ffmpegcv

[sugizo]

objective
write video output using ffmpegcv

steps
pip install -U rtsp ffmpegcv

code

import rtsp
import ffmpegcv
url = 'http://clausenrc5.viewnetcam.com:50003/nphMotionJpeg?Resolution=320x240' # aspect ratio = 4:3
client = rtsp.Client(rtsp_server_uri = url, verbose = False)
output_file = 'rtsp_ffmpegcv_time.mp4'
vidout = ffmpegcv.VideoWriter(output_file, None, pix_fmt = 'bgr24')
i = 0
while i <= 9:
    frame = client.read(raw = True)
    vidout.write(frame)
    i += 1
client.close()
vidout.release()

result

AttributeError                            Traceback (most recent call last)
[<ipython-input-29-fc5430a80232>](https://localhost:8080/#) in <cell line: 11>()
     12     frame = client.read(raw = True)
     13 
---> 14     vidout.write(frame)
     15 
     16     i += 1

[/usr/local/lib/python3.10/dist-packages/ffmpegcv/ffmpeg_writer.py](https://localhost:8080/#) in write(self, img)
     65                 height = int(height_15 / 1.5)
     66             else:
---> 67                 height, width = img.shape[:2]
     68             self.width, self.height = width, height
     69             self.in_numpy_shape = img.shape

AttributeError: 'NoneType' object has no attribute 'shape'

best regards

[sugizo]

code

import rtsp
client = rtsp.Client(rtsp_server_uri = url, verbose = True)
i = 0
while i <= 9:
    frame = client.read(raw = True)
    print(frame)
    i += 1
client.close()

result
sometime return numpy array
sometime None
but
the same code on first post is work well
when using vidgear to write the output video

best regards