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  • ffmpeg-python outputs black screen when trying to save as mp4

    3 mars 2023, par Saya

    This is my code. I am trying to make a video out of all pictures in the pics2 directory using ffmpeg.

    


    import subprocess

command = 'ffmpeg -framerate 1 -i "pics2/Image%02d.png" -r 1 -vcodec libx264 -s 1280x720 -pix_fmt yuv420p Output.mp4'
p = subprocess.call(command, shell=True)


    


    This saves an Output.mp4 successfully but the video has no frames (It is completely black)

    


    How do I solve this ?

    


  • opencv3.1 python VideoCapture black screen

    3 mai 2017, par alex

    i’m trying to use opencv3.1 with python3.5
    following this official)tutorial
    http://docs.opencv.org/3.0-beta/doc/py_tutorials/py_gui/py_video_display/py_video_display.html#display-video

    the camera led is "on" but the window doesn’t show any image (black)

    my current enviroment :
    - windows 10
    - python 3.5.2 (32bit)
    - numpy 1.12.0b1 (32bit) binaries downloaded from : http://www.lfd.uci.edu/ gohlke/pythonlibs/
    - opencv 3.1.0 (32bit) binaries downloaded from : http://www.lfd.uci.edu/ gohlke/pythonlibs/

    they seem installed correctly !

    as the tutorial says :

    Note Make sure proper versions of ffmpeg or gstreamer is installed. Sometimes, it is a headache to work with Video Capture mostly due to wrong installation of ffmpeg/gstreamer.

    i’ve no ffmpeg installed !!! so i suppose this is the cause of my problem
    so the questions are :
    1) which version of ffmpeg is needed ?
    2) how install ffmpeg on windows ? it seems a setup doesn’t exist(there is a binary section with a zip file ? how to use it after unzipped ?)
    3) is possible to see(in some way) if the opencv binaries(that i’ve downloaded) were compiled with ffmpeg support(flag ?)

    PS : i’ve tried to add the ffmpeg folder path the the PATH enviroment variable but nothing change

  • Rotate video adding black bars with ffmpeg [closed]

    24 juillet 2020, par MrMoog

    I have a lot of mp4 full hd videos made with a smartphone that looks rotated 90°.

    



    These files have proper rotation metadata and they plays correctly on VLC or other desktop mediaplayers, but I want to display them on my dvd player that does not handles mp4 metadata.

    



    So I tried to transpose with ffmpeg but I obtain 1080x1920 files, resolution obviously not recognized by tv/dvd-player.

    



    How can I transpose, resize and add black side (left/right) bars of the correct dimensions to get "correct" 1920x1080 videos ?

    


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