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• iphone ios sample ffplay main.c —> FFmpeg.c change and input parameter , following errer please advice

  4 août 2017, par 224ok

  FFmpeg main c source

  int main(int argc, char **argv)
  
  {
  
  
  
      int flags, i;
  
      argv[1] = "-i";
  
      argv[2] = "ipod-library://item/item.mp3?id=1218551163727305907";    
  
           //argv[2] = "mon.mp3";
  
  
  
      argv[3] = "-acodec";
  
      argv[4] = "libfaac";
  
      argv[5] = "-ac";
  
      argv[6] = "2";
  
      argv[7] = "-ar";
  
      argv[8] = "44100";
  
      argv[9] = "-ab";
  
      argv[10] = "128k";
  
      argv[11] = "output.aac";
  
      argv[3] = "-vn";
  
      argv[4] = "-acodec";
  
      argv[5] = "libfaac";
  
      argv[6] = "-ac";
  
      argv[7] = "2";
  
      argv[8] = "-ar";
  
      argv[9] = "44100";
  
      argv[10] = "-ab";
  
      argv[11] = "128k";
  
      argv[12] = "output.aac";
  
      //  argv[14] = "rtsp://video.bouygtel.fr/50400/tf1.sdp";
  
      argc += 12;

  error : ipod-library ://item/item.mp3 ?id=1218551163727305907 : No such file or directory
  and if
  argv[2] = "mon.mp3" ; ---> mon.mp3 : No such file or directory

  please advice.

• FFMPEG encoding is rotating portrait images uploaded from the iPhone

  27 juillet 2017, par Kevin J

  I’m trying to figure out why FFMPEG is rotating my thumbnail image when a portrait video is uploaded from an iphone.

  Here is my command line test :

  ffmpeg -i video/test.mp4 -c:v libx264 -profile:v high -level 5 -crf 18 -preset medium -maxrate 10M -bufsize 16M -pix_fmt yuv420p -vf "scale=iw*sar:ih, scale=\'if(gt(iw,ih),min(1920,iw),-1)\':\'if(gt(iw,ih),-1,min(1080,ih))\'" -x264opts bframes=3:cabac=1 -movflags faststart -b:a 320k -y video/test.mp4 -vcodec mjpeg -vframes 1 -an -f rawvideo -s 410x231 video/testthumb.jpg 2>&1

  Then the portrait image is rotated 90 degrees to be made a landscape image, but the video stays portrait. How can I keep the orientation the same ?

• Why are Iphone videos upside down ?

  7 juillet 2017, par hendry

  I have a video file captured using the standard Camera app copied off my Iphone5 using btsync :

  orig.mov: ISO Media, Apple QuickTime movie

  That plays upside down in mplayer or vlc.

  When I transcode it using AWS’s elastictranscoder using a standard preset :

  elastictranscoder.mpg: ISO Media, MPEG v4 system, version 1

  That transcoded video file plays back the right way up.

  When transcoding myself, using ffmpeg I need to explicitly rotate the video otherwise the resulting mp4,webm files are upside down.

  So I am guessing AWS’s elastictranscoder auto rotates the video somehow. However why is the video upside down to begin with ?