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• Crossfade between images in video using ffmpeg in android

  11 septembre 2015, par vishnus

  I have managed to create a video from a series of images using this ffmpeg library ffmpeg-android-java

  My command to generate the video is

  "-y -r 1/3 -i /path/img%d.jpg  +
  
    "-strict experimental -vcodec libx264 -pix_fmt yuv420p -preset ultrafast -t 21 -crf 30 /path/out.mp4"

  In my case each image is shown for 3 seconds in the video and video is made of total 7 images.

  I want to achieve a crossfade effect when the images change in the video.

  If anyone has done this before then please point me in the right direction.

• Generating 64kbps audio-only mpegts for HTTP Live segmenter to meet 64kbps audio only requirement

  14 juin 2013, par Pobre

  I am trying to convert our mp4 files into mpeg-ts and segment it into .ts files for my iphone app to play. I am using Carson McDonalds's HTTP-Live-Video-Stream-Segmenter-and-Distributor to do that.

  I got his stuff complied and working correctly. I am currently trying to meet Apple's requirement where I need to provide a baseline 64 kbps audio only stream to my m3u8 playlist.
  Carson doesn't seem to have a profile for that.

  I need to be able to generate 64kbps audio-only stream from mp4, and turn that into mpeg-ts for the segmenter into ts. I am trying to find the right ffmpeg command that will validate without problem using Apple's mediastreamvalidator.

  So far I modified an existing encoding profile to try to achieve 64kbps total :

  ffmpeg -er 4 -i %s -f mpegts -acodec libmp3lame -ar 22050 -ab 32k -s 240x180 -vcodec libx264 -b 16k -flags +loop+mv4 -cmp 256 -partitions +parti4x4+partp8x8+partb8x8 -subq 7 -trellis 1 -refs 5 -coder 0 -me_range 16 -keyint_min 25 -sc_threshold 40 -i_qfactor 0.71 -bt 64k -maxrate 16k -bufsize 16k -rc_eq 'blurCplx^(1-qComp)' -qcomp 0.6 -qmin 10 -qmax 51 -qdiff 4 -level 30 -aspect 4:3 -r 10 -g 30 -async 2 - | %s %s %s %s %s

  but then when I try to validate it using mediastreamvalidator, it gives error after few ts :

  Playlist Validation : OK

  Segments :

  sample_cell_4x3_64k-00001.ts :

  WARNING : Media segment exceeds target duration of 10.00 seconds by 1.30 seconds (segment duration is 11.30 seconds)

  sample_cell_4x3_64k-00002.ts :

  WARNING : Media segment exceeds target duration of 10.00 seconds by 1.40 seconds (segment duration is 11.40 seconds)

  ....
  ....

  sample_cell_4x3_64k-00006.ts :

  ERROR : (-1) Unknown video codec : 1836069494 (program 0, track 0)
  ERROR : (-1) failed to parse segment as either an MPEG-2 TS or an ES

  sample_cell_4x3_64k-00007.ts :

  ERROR : (-1) Unknown video codec : 1836069494 (program 0, track 0)
  ERROR : (-1) failed to parse segment as either an MPEG-2 TS or an ES

  ....
  ....
  Average segment duration : 10.26 seconds
  Average segment bitrate : 376797.92 bps
  Average segment structural overhead : 349242.17 bps (92.69 %)

  Is there someway I can generate this correctly with just audio which totals 64kbps and turn it into mpeg-ts ready to be segmented and validated correctly ?

  Am I approaching the problem right ?

• convert .mts to flv using ffmpeg and file size will 300 mb and more [closed]

  20 juin 2013, par user1966466

  i have problem , when i have uploaded video and convert to flv for all formate .

  my code is not working when i have used .mts formate and size 300 MB and more

  if(move_uploaded_file($tmp, $path.$video_name_extension)){ 
  
  
  
      exec("/usr/local/bin/ffmpeg -i courses/$video_name_extension  -ar 44100  -ab 128k  -r 25  -vcodec flv -crf 15 -b 700000 courses/$video_name");          
  
      exec("/usr/local/bin/ffmpeg  -itsoffset -4  -i courses/$video_name_extension -vcodec mjpeg -vframes 1 -an -f rawvideo -s 320x240 courses/$video_image");
  
  
  
  
  
          $cmd = "/usr/local/bin/ffmpeg -i courses/$video_name 2>&1";
  
          if (preg_match('/Duration: ((\d+):(\d+):(\d+))/s', `$cmd`, $time)) {
  
             $total = ($time[2] * 3600) + ($time[3] * 60) + $time[4];            
  
          }
  
          exec($cmd);
  
          $time = convertToHHMMSS($total);
  
          //echo "updated 2";
  
      //  exit;
  
          mysql_query("INSERT INTO tbl_teacher_video (user_id,title,video,video_image,duration,arts_name,video_type,added_on) VALUES ('".$_SESSION['id']."','$txt','$video_name','$video_image','$time','".$_POST['courseradio']."','2','".date('Y-m-d')."')");
  
          unlink('courses/'.$video_name_extension);