Hiding log (Missing reference picture, default is 0 | decode_slice_header error)

Python
1

I am using OpenCV to read the video with specific frame

cap = cv2.VideoCapture(video_path)
cap.set(cv2.CAP_PROP_POS_FRAMES, frame_index)
ret, frame = cap.read()

I got the message

Missing reference picture, default is 0 
decode_slice_header error

I believe the problem might be because of my video file. This result is not effect anything to my reading frame and face detection.
But the problem for me is, I just want to hide this log from my Jupyter to can present a clean paper to my client.

Can someone suggest me the best way to approach this?

2

main problem is, like any other python noob, you’re ignoring the ret value from cap.read() (copy-paste code)

you MUST check, if reading was successful, else you run into further problems, trying to process an invalid image

3

Those messages come from ffmpeg and its codecs.

This message lets you know that your video stream is incomplete. You are likely to get artefacts in the following few frames.

I don’t know of a way to quiet this output. It might be possible with undocumented environment variables.

There might be a way to redirect stdout but that might also interfere with Jupyter.

You could just transcode that video file, using ffmpeg. Then you’ll have a clean file.

1 Like
4

@crackwitz yeah transcode with ffmpeg work for me. I just use ffmpeg generate new file and it solve my problem. Big thanks for this.

5

It is the sample code to explain what is happening. Anyway, what you mention is not related to what I am asking.