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• ffmpeg : Need to convert source video to web/phone html5 players. Willing to pay [on hold]

  25 juillet 2015, par mariotanenbaum

  I need somebody to write me commands for converting videos and i’m willing to pay that.

  I need to convert most of these : (if ffmpeg doesn’t support any of those, just ignore it)

  mov (QuickTime Movie)
  mp4 (MPEG-4 Video)
  mpe (MPEG Video)
  mpeg (MPEG Video)
  mpeg4 (MPEG-4 Video)
  3g2 (Mobile Video)
  3gp (Mobile Video)
  3gpp (Mobile Video)
  asf (Windows Media Video)
  avi (AVI Video)

  To most of these :

  HTML5, Flash : MP4/H.264, High profile
  HTML5 : WebM
  HTML5 : Ogg
  Mobile : MP4/H.264, Baseline profile, 480x360, for wide compatibility
  Mobile : MP4/H.264, Main profile, 1280x720, for newer iOS devices (iPhone 4, iPad, Apple TV)
  Mobile : 3GP/MPEG4, 320x240 and/or 177x144, for non-smartphones*

  Nothing which would not work out of box in ffmpeg
  Some tweaking about processor usage and quality is ok but not so important.

  Goal is to get suitable clips for playing in chrome, firefox, ie9, iphone and android.
  For now iphone is the most important.

  IF you have some spare time, feel free to contact me, i would pay somebody just to send me "commands". It doesn’t to be anything "smart" just so that i don’t need to spend so much time trying learn all about ffmpeg.

• iOS Libavcodec - Trim and convert a video

  14 juillet 2015, par AnujAroshA

  In my iOS project, I am trying to take an .mp4 video file, cut out a small clip in the middle of the file, and convert the output to .mov file. I am using libavcodec to do this.

  I built the FFmpeg libraries for iOS using this script and added to my project.

  The code I am using to trim and convert the video file is this.

  The issues with final output of the file are :

  1. When I copy the output from the iPhone to my mac, the video meta data for duration and video dimensions are blank. If I do the same for the original, I get the video length and dimensions correctly. I must not be creating the video meta data on the new video correctly.

  2. The frame rate on the outputted video appears to be wrong. I expect to see e.g. 250 frames over 10 seconds (25fps), but instead I see 250 frames over 4 seconds, then only the last frame for the remaining 6 seconds.

  3. The code should seek to 100s in the video before starting trimming. Instead, the code appears to crop the video starting at the beginning.

• ffmpeg - Audio not playing on iOS with transcoded video

  23 juin 2015, par Dev

  I am using Laravel 4.2.

  I am working on a project that provides video services. To transcode video (to play on all devices) I’ve used git-hub package php ffmpeg.

  By transcoding video, I found it is NOT working with iPhone 5s. I searched for solution and found some changes in parameters passed to the library.

  Finally, I come up with the command below that the library uses to transcode the video.

  ffmpeg -y -i video.mp4 -async 1 -metadata:s:v:0 start_time=0 -s 560x320 
  
      -vcodec libx264 -strict experimental -pix_fmt yuv420p -profile:v baseline 
  
      -acodec aac -profile:a aac_low -b:v 466k -refs 6 -coder 1 -sc_threshold 40 
  
      -flags +loop -me_range 16 -subq 7 -i_qfactor 0.71 -qcomp 0.6 -qdiff 4 
  
      -trellis 1 -b:a 256k -ac 2 transcode_video.mp4

  The video is playing well but the audio is NOT working on iOS. Hence the video is playing without audio. I am using HTML 5 player to play the video and auto play option is off.

  Any suggestions ?