Recherche avancée

Sur d’autres sites (7435)

• Creating video from images produces black screen video for certain image formats [duplicate]

  30 mai 2018, par varmashrivastava

  This question already has an answer here :

  • FFMPEG x264 MP4 Encoding all grey
    
    1 answer
    
  • FFmpeg converting image sequence to video results in blank video [closed]
    
    1 answer
    

  I am using below command to create video from images.The command works fine for most images but for png images the video created cannot be played and I just get a black screen.

   String[]  command = new String[]{"-y", "-f", "concat", "-safe", "0", "-i", src.getAbsolutePath(), "-vsync", "vfr", "-vf", "scale=1280:720:force_original_aspect_ratio=decrease,pad=1280:720:(ow-iw)/2:(oh-ih)/2", dest.getAbsolutePath()};

  Here destination file path has mp4 format..
  Whats wrong with my command ?

• How to read a video stream(H.264) bitrate via ffmpeg if the video is VBR

  26 janvier 2021, par Sean

  as stated in the title, if I want to use ffmpeg to read a video bitrate for an h264 stream in MP4/AVI, how does it work ?

  


• How to create a video thumbnail without ffmpeg or HTML5 video canvas ? [duplicate]

  14 mai 2014, par user3631926

  This question already has an answer here :

  • How to generate thumbnails on Amazon S3 ?
    
    2 answers
    

  I need to create a thumbnail from a video, I have tried the below options but they didn’t work for my case. I am using S3 and CloudFront.

  1. ffmpeg is not supported via my hosting because I am using a shared hosting and I need to upgrade to VPS or dedicated server if I want to use ffmpeg.

  2. I tried taking a screenshot from the video using HTML5 drawImage and toDataURL functions, but it is throwing SecurityError because my video file is located on Amazon CloudFront and my code is hosted somewhere else.

  Is there any other option or a workaround to the second option ? I don’t want to upgrade my server for just the thumbnail issue.