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  • problem with changing the frames in an video with opencv

    5 septembre 2023, par Avizipi

    I have a code that runs in the last few months without any problem. The code shows an image from a video with extra data from the relevant db. using the keyboard you can jump around some frames and get better insights. However, in the last week changing the frame of the video stopped working.

    


    I built a small script that show the problem.

    


    import cv2

vid_cap_reader_path = "vid_230830_122746_C.avi"
cap_rgb = cv2.VideoCapture(vid_cap_reader_path)

k = 0
while 1:
    if k == ord("q"):
        break
    if k == ord("b"):
        before = cap_rgb.get(cv2.CAP_PROP_POS_FRAMES)
        cap_rgb.set(cv2.CAP_PROP_POS_FRAMES, before + 30.0)
        after = cap_rgb.get(cv2.CAP_PROP_POS_FRAMES)
        print(f"before = {before} after = {after}")
    ret, img = cap_rgb.read()
    if ret:
        cv2.imshow("bla", img)
        k = cv2.waitKey(0)
    else:
        break


    


    This is what is printed to the terminal :

    


    [mpeg4 @ 0x1d87400] warning: first frame is no keyframe
before = 36.0 after = 0.0
before = 67.0 after = 0.0
[mpeg4 @ 0x1d87400] warning: first frame is no keyframe
before = 40.0 after = 0.0
[mpeg4 @ 0x1d87400] warning: first frame is no keyframe


    


    The video itself doesn't "jump" for the next frame as expected and also most of the properties that opencv have return 0. I tested also CAP_PROP_FRAME_COUNT, and CAP_PROP_POS_MSEC without any lack, although the msec flag did give non-zero results which make no sense.

    


    It is also important to mention that I am building this application in a docker file and I am not using a specific version for my requirements. The tests here are with opencv-python==4.7.0.68. Also, the videos are working fine while playing them on VLC.

    


    I was looking around the net for a similar problem from the recent time and didn't find much except this github issue that may be similar. I started to downgrade opencv one by one without any luck.

    


    Maybe someone here can help with this issue, or give me a lead to doing something different.

    


  • Revision a721e5cb0f : Merge "Build / make problem" into experimental

    5 novembre 2012, par Yaowu Xu

    Merge "Build / make problem" into experimental

  • avcodec/nvenc : add rate control option

    25 mai 2016, par Andrey Turkin
    avcodec/nvenc : add rate control option

    Signed-off-by : Timo Rothenpieler <timo@rothenpieler.org>
    • [DH] libavcodec/nvenc.c
    • [DH] libavcodec/nvenc.h
    • [DH] libavcodec/nvenc_h264.c
    • [DH] libavcodec/nvenc_hevc.c

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