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  • How to pad video with black frames to a given length with FFmpeg ?

    17 octobre 2023, par ed22

    I am aware that tpad filter has the stop_duration parameter that adds frames to the end of video. How do I make sure that the resulting video is say 5 seconds in length when the input length is unknown (but less than 5s) ?

    


  • how to resize and keep video keep aspect ratio and pad with black bars [duplicate]

    20 septembre 2017, par Sepehr Norouzi

    This question already has an answer here :

    I need to resize my video with ffmpeg.

    It’s MP4 with width 640 and height 360. How can i resize it and keep aspect ratio and pad with black bars so that the video size is exactly ... ?

    I already tried some codes on Linux but it just damages file.

  • JavaCV - strange black screen when playing a file with FFmpegFrameGrabber

    17 mai 2012, par noncom

    I am using JavaCV and it's FFmpegFrameGrabber in my project. It loads and player files OK, when I launch the project from Eclipse, but shows either a black screen or a still 1st frame when I run a compiled project. Sometimes comming with this error :

    Input #0, avi, from 'C:/path/Start_Cut.avi':
    
Duration: 00:00:20.03, start: 0.000000, bitrate: 26002 kb/s
    
Stream #0.0: Video: mpeg4, yuv420p, 1920x1080, 30 tbr, 30 tbn, 30 tbc
    
Cannot allocate memory. com.googlecode.javacv.FrameGrabber$Exception: Cannot initialize the conversion c ontext.
    
            at com.googlecode.javacv.FFmpegFrameGrabber.start(FFmpegFrameGrabber.jav a:280)

    and sometimes with

    [mpeg4 @ 6A95DF20] Invalid and inefficient vfw-avi packed B frames detected
    
Input #0, avi, from 'C:/path/Start_Cut.avi':
    
  Duration: 00:00:20.03, start: 0.000000, bitrate: 26002 kb/s
    
    Stream #0.0: Video: mpeg4, yuv420p, 1920x1080 [PAR 1:1 DAR 16:9], 25 tbr, 30
    
 tbn, 25 tbc

    does anyone has a clue on this ?

    UPDATE :

    I have been able to narrow down the problem. For some reason, FFmpegFrameGrabber returns null upn calling the grab() method. Why does it work in Eclipse and does not work in standalone build ? All libraries are included and I suppose, it would come up with an error if they did not.

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