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• FFmpeg_frame toGDImage produces messed up thumbs

  27 juin 2013, par user2526873

  I have written a script in PHP that uploads a movie, converts it to FFmpeg movie and gets the thumb. Everything is working ok, but my thumbs have some sort of blue overlay. My code is :

  $movie = new ffmpeg_movie($uploadFile); 
  
  $frame = $movie->getFrame(15)->toGDimage();
  
  
  
  $width = imagesx($frame); 
  
  $height = imagesy($frame); 
  
  
  
  $framecrop = imagecreatetruecolor(100, 80);
  
  imagecopyresampled($framecrop, $frame, 0, 0, 0, 0, 100, 80, $width, $height);
  
  imagejpeg($framecrop,"file.jpg");

  What am I doing wrong ? I have this problem with all the movies I upload.

  Thanks in advance for your answers !

• ffmpeg output for flac and wav differs, why ?

  9 juin 2012, par burzum

  I need to parse ffmpegs meta data output but it is different for some reason between a wav and a flac file.

  Flac :

  (int) 14 => '  Duration: 00:03:18.93, bitrate: 1045 kb/s',
  
  (int) 15 => '    Stream #0:0: Audio: flac, 44100 Hz, stereo, s16',

  Wav :

  (int) 13 => '  Duration: 00:00:15.00, bitrate: 1411 kb/s',
  
  (int) 14 => '    Stream #0:0: Audio: pcm_s16le ([1][0][0][0] / 0x0001), 44100 Hz, stereo, s16, 1411 kb/s',

  I could get the bitrate from the duration line too I think but why is it different ? And will there be more differences in future releases ? It really sucks that there is no better way to get the information from ffmpeg than to parse it's output. Any better ideas ?

  Here is my whole ffmpeg output and my parsed result :

  http://pastebin.com/4qJfzZNL

• FFmpeg - How to scale a video then apply a watermark ?

  28 août 2016, par Olibanum

  Im trying to scale a video so that it is always 512 wide where the height changes in proportion to the original video.
  Once scaled, I then want to apply a watermark/overlay to the video, therefore the video will scale but the watermark wont.

  I am able to achieve each of these separately using the following filters :

  Scale

  -vf "scale=512:-1"

  Watermark

  -vf "movie=watermark.png [watermark]; [in][watermark] overlay=(main_w-overlay_w)/2:(main_h-overlay_h)/2 [out]"

  They work successfully on their own.

  However when trying to combine the two, Im having a bit of trouble.

  Having both as parameters of course does not work as one will override the other.

  Ive tried :

  -vf "scale=512:-1,movie=watermark.png [watermark]; [in][watermark] overlay=(main_w-overlay_w)/2:(main_h-overlay_h)/2 [out]"

  my thinking was that the scale would be applied first then the watermark but all I get is an error

  Too many inputs specified for the "movie" filter.

  Error opening filters !

  Then changing the , to a ; resulted in :

  Simple filtergraph ’scale=512 :-1 ;
  movie=watermark.png
  [watermark] ; [in][watermark]
  overlay=(main_w-overlay_w)/2 :(main_h-overlay_h)/2 [out]’ does not have
  exactly one input and output.

  Error opening filters !

  I presume I need to do something more with filterchains but Im struggling to figure it out.

  Any ideas anyone ?

  Many thanks in advance.