Recherche avancée

Sur d’autres sites (9433)

• ffmpeg-php how to convert video and audio the way to use it [on hold]

  8 octobre 2014, par Kareem Moro

  well..i’m working on website that allow users to uploading videos and audio tracks and as you all know that html5 video & audio tags are not supported in all browsers or even all versions
  so i found that ffmpeg is the best way to convert files formats to be supported on all browsers
  i’ve downloaded ffmpeg but i just don’t know how to use it in php scripts or the way to convert the audio or video
  and also wanna know how to control the video quality like youtube
  or even facebook HD or none

• Which value exactly tells the video stream bit rate in ffmpeg output ?

  8 septembre 2011, par userffmpeg

  I have a basic doubt. In the following ffmpeg output, which of the bit rate values (in bold) tells us the video bit rate ?

  Input #0, mov,mp4,m4a,3gp,3g2,mj2, from 'MVI_0135.MOV' :
  Metadata :
  major_brand : qt
  minor_version : 537331968
  compatible_brands : qt CAEP
  creation_time : 2011-04-25 14:59:29
  Duration : 00:00:33.03, start : 0.000000, bitrate : 20588 kb/s
  Stream #0.0(eng) : Video : h264 (Constrained Baseline), yuvj420p, 1280x720, 19028 kb/s, 23.98 fps, 23.98 tbr, 24k tbn, 48k tbc
  Metadata :
  creation_time : 2011-04-25 14:59:29
  Stream #0.1(eng) : Audio : pcm_s16le, 48000 Hz, 2 channels, s16, 1536 kb/s
  Metadata :
  creation_time : 2011-04-25 14:59:29

  Its a very basic question, but I would appreciate if anyone could tell me...

• FFmpeg on iPhone - Modifying Video Orientation

  6 avril 2015, par Matthew McGoogan

  I’m messing with h264 videos loaded with FFmpeg on the iPhone 3GS. The problem is any videos recorded in "Portrait" orientation have a transformation matrix applied to them causing them to display rotated 90 degrees counter-clock.

  From what I understand thus far, I just need to modify the transform matrix in the ’tkhd’ atom. The problem is I am having trouble accessing or modifying this data. I checked out the FFmpeg implementation for :

  static int mov_read_tkhd(MOVContext *c, ByteIOContext *pb, MOVAtom atom)

  which clearly shows how the matrix is accessed in avformat but when I try to access the header bytes using the same functions I am not getting any rational values. Even if I were to successfully pull the matrix I’m not sure how to replace it ? FFmpeg has functions for retrieving and appending to the track header but nothing for replace it seems ?

  Any help would be greatly appreciated.

  Thanks,
  Matt.