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• Capture video on iOS device and live stream it to a server (or another mobile)

  13 février 2015, par theDuncs

  I want to be able to record footage using my iOS device and stream it directly to a server.

  There’s quite a few articles on S.O. that talk about this, but I’m not sure any have answered the question very well.

  Should I be using HTTP Live Streaming, or is this just for sending data to an iPhone ?
  Should I be using AVCaptureSession to grab the video (a segment at a time ?), sending each segment to the server ?
  Should I be using AVCaptureVideoDataOutput and ffmpeg for streaming ?

  I’m a little lost with all this, so any sample code or docs or links would be really appreciated.

  Thanks for your help guys.

  Duncan

• Use ffmpeg to watermark and scale an image on video

  11 mai 2015, par Ae.

  I want to be able to watermark videos with a logo image, which contains a website url.
  The videos can be of different formats and dimension.
  I’m trying to figure out a generic ffmpeg command to achieve it, so that i don’t have to tweak the command depending on the video i have to process.
  So far i got :

  ffmpeg -i sample.mov -sameq -acodec copy -vf 'movie=logo.png [watermark]; [in][watermark] overlay=main_w-overlay_w-10:main_h-overlay_h-10 [out]' sample2.mov

  In this way though the logo will look too big or too small with video of different size.
  I’ve seen there is a scale option for avfilter, but I haven’t figure out whether it’s possible to resize the image logo based on the dimension of the input video, so that I can say to scale the logo to 1/3 of the video length for example, and keep the image ratio.

  Any idea ? doesn’t need to be done in a single command, could even be a script.
  thanks in advance.

• When converting .mov to .flv video plays horizontally

  2 janvier 2014, par user291247

  When I record a video (.mov) through my iPhone it display vertically which is right.
  But after converting the .mov to .flv(using ffmpeg) it displays horizontally.

  My code :

  function convert_flv($vidtime,$infile, $outfile, $w = 0, $h = 0, $extra_infile = '', $extra_outfile = '') {
  
      $parms = '';
  
      if($w == 0 && $h == 0) {
  
          //$parms .= '-sameq ';
  
      } else {
  
          $parms = '-s {$w}x{$h} ';
  
      }
  
  
  
      if($vidtime==60) {
  
          $cmd = ffmpeg($infile, $outfile, $parms.' '.$extra_infile, '-t 00:01:00 -ar 22050 -r 15 -f flv  '.$extra_outfile);
  
      } else {
  
          $cmd = ffmpeg($infile, $outfile, $parms.' '.$extra_infile, '-t 00:04:00 -ar 22050 -r 15 -f flv  '.$extra_outfile);
  
      }
  
  
  
      print_r($cmd);
  
      return $cmd;
  
  }