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• Best video format for video processing and converting to mp4

  29 août 2014, par Max Grigoriev

  I may have video in selected format and I should make some video changes - add logo to the whole video as example and then convert to mp4. Right now original file is in h.264/mp4 format too. As I understand to add logo original file should be decoded to frames then logo should be added and then frames should be encoded to H.264 and packed to mp4. Since I’m newbie in video processing maybe there’s a raw video format which removes decoding stage and it saves time and cpu ?

  Thanks

• Rendering list of images over a video with ffmpeg does not work if video has audio

  12 mai 2023, par Alex Stirken

  I'm using FFmpegKit for Flutter to render a list of changing images onto a video.
Im using the following arguments :

  


  final arguments = [
  '-y',
  '-i', inputVideoPath,
  '-framerate', '$fps',
  '-start_number', '100',
  '-i', '${tempDirectoryPath}/%3d.png',
  '-filter_complex', '[1:v]scale=720:1280 [ovrl]; [0:v][ovrl]overlay=0:0,format=yuv420p[v]',
  '-map', '[v]',
  '-c:v', 'libx264',
  "-preset", "medium",
  '-pix_fmt', 'yuv420p',
  '-shortest',
  '$outputFilePath'
];


  


  It works like a charm as long as the video file (.mp4) has no audio stream. If the video has an audio stream, only the first image is getting rendered (overlayed) over the video.

  


  Any suggestions ?

  


• Create time lapse video from other video

  17 décembre 2023, par Orlando

  Using avconv (or even ffmpeg, so I can use as a reference), how can I create a time lapse video by taking only anchor/reference frames from another video ? Most information I find is on how to create a time lapse video by combining images, and I'd like to do it by extracting frames from a video. Say, if a video is 30 seconds long at 30 FPS, I'd like to take 60 out of those 900 frames (900/60 = every 15 seconds) to produce a 2 second video.