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• FFMpeg : Images into video

  12 mars 2012, par Mark

  I'm trying to turn a series of images into a video.

  My idea is to have a very low frame rate so it's essentially a slideshow video for the frames.

  I currently have my images in the following format...

  *1-1.jpg
  *1-2.jpg
  *1-3.jpg
  *1-4-1.jpg
  *1-4-2.jpg
  *1-4-3.jpg
  *2-1.jpg
  *2-2.jpg

  etc...

  So, here's the command I'm trying to run...

  c:\wamp\www\videos\images>c:\ffmpeg\bin\ffmpeg.exe -f image2 -r 1 -i %d-%d.jpg movie.mpg

  This command won't do exactly what I want it to, but it'll let me at least get a test video done.

  Ideally, I'd like to be able to do multiple run throughs via PHP (which will be easy, I think once I get a working command)

  So, on the first run it would process all the images that start with 1, then on the second the ones that start with 2, and so on.

  However, no matter how I format the image section of the command, I get the following error...

  %d-%d.jpg: No such file or directory

  If I just do %d.jpg, I get the same error, but with %d.jpg instead of %d-%d.jpg

  Do you have any ideas how I can get this to work ? If I can get it to work with one set, I can use variables and loops in PHP to get it to process the other videos I'll be making.

  Thanks in advance for any thoughts.

• FFMpeg-example of encoding, decoding and playing frames of MPEG4-video continiously ?

  28 mars 2012, par Anders Branderud

  I am looking for an example-code for FFMPEG, which does the following :

  1. Encodes a file using the MPEG4-codec frame by frame, putting the size of the different frames in an array, and putting the frames in an array [here called 'output-buffer'] - one frame per index of the array. Do this until the file reaches it

  Until the end of the output-buffer :
  Take the first 25 frames.
  [When 25 frames are reached, in my code, in my code the frames will be divided into equal-sized packets ; with a small header giving some information about the frames and their frame size ; and Forward Error Erasure-correction code will be added ; and then the packets will be sent continiously.]

  1. [This will in my code take place on the receiving UDP-socket. It receives the frames continiously. It decodes each Forward Error Erasure-session block. It then reassembles the frames ; and puts them into an array - one frame per index of the array.]
     It does this for 25 frames at a time of the output-buffer :
     It decodes the encoded data - frame by frame - from the output-buffer.
     Add necessary additional information to this 25-frames-segment that is required in order for it to be playable.
     Play the 25 frames/put them in a queue to be played.

  I am aware of the decoding_encoding.c-example (in /doc/examples of the FFMPEG-library) and wonder which changes that are needed to be made in order to accomplish the above specified functionality ? I am requesting some example-code for this to be done ; including how play the movie and how to feed it with new frames continiously at the same time as previous frames of the movie are played.

  This code 'http://cekirdek.pardus.org.tr/~ismail/ffmpeg-docs/api-example_8c-source.html' ; could be used as a base. I want it to read in from a real mpg-file, instead of creating dummy images and encoding the dummy images.

  Thanks in advance !

• PHP - FFMPEG - Unable to apply multiple regular expressions on media output

  9 avril 2012, par Parth G

  I am writing a php script (I have to use php) to cycle through a dir of media files and displaying media information in a chart.

  Right now, I'm trying to do it on 1 file.

  I can successfully do so. I currently can parse the output (using regular expressions) to obtain information such as file name, duration, resolution, etc

  I was told that I can combine the regular expressions to make it more efficient.

  When I do however, I am unable to parse the ffmpeg output correctly.

  Consequently, I've tried copying the output to a string and parsing that using multiple expressions and it works just fine.

  Any help is appreciated.

  Thanks.

  ---

  Working code

  $media_info = "'test.mkv': Metadata: creation_time : 2011-03-12 09:04:18 Duration: 00:21:44.10, start: 0.000000, bitrate: 500 kb/s Chapter #0.0: start 0.097000, end 1304.107000 Metadata: title : 00:00:00.097 Stream #0:0: Video: h264 (High), yuv420p, 720x400 [SAR 80:81 DAR 16:9], 23.98 fps, 23.98 tbr, 1k tbn, 47.95 tbc (default) Stream #0:1: Audio: aac, 48000 Hz, stereo, s16 (default) At least one output file must be specified";
  
  
  
  
  
  $file = array();
  
  $file_test = preg_match_all("/'([a-zA-Z0-9\._]*\.[a-zA-Z0-9]*)'.* Duration: ([0-9]{2,}:[0-9]{2}:[0-9]{2}\.[0-9]*)/", $media_info, $file);;
  
  var_dump($file)

  ---

  Not Working Code

  ob_start();
  
  passthru("C:\\wamp\\www\\ffmpeg\\bin\\ffmpeg.exe -i \"{$videofile}\" 2>&1");
  
  $raw_data = ob_get_contents();
  
  ob_end_clean();
  
  
  
  
  
  $ffmpeg_info =  explode("from", $raw_data);
  
  
  
  
  
  $media_info = $ffmpeg_info[1];
  
  
  
  $file = array();
  
  $file_test = preg_match_all("/'([a-zA-Z0-9\._]*\.[a-zA-Z0-9]*)'.* Duration: ([0-9]{2,}:[0-9]{2}:[0-9]{2}\.[0-9]*)/", $media_info, $file);;
  
  var_dump($file)

  ---

  New Code

  I tried using the ffmpeg-php extension and the following works (except for printing the bit rate)

  $movie = new ffmpeg_movie($video_file);
  
  
  
  echo $movie->getFilename();
  
  echo "<br />" ; 
  
  echo $movie->getDuration();
  
  echo "<br />" ;
  
  echo $movie->getFrameWidth();
  
  echo "x";
  
  echo $movie->getFrameHeight();
  
  echo "<br />" ; 
  
  echo $movie->getBitRate();
  
  echo "<br />" ; 
  
  echo $movie->getVideoBitRate();
  
  echo "<br />" ; 
  
  echo $movie->getAudioBitRate();
  
  echo "<br />" ;
  
  echo $movie->getVideoCodec();
  
  echo "<br />" ;
  
  echo $movie->getAudioCodec();
  
  ?>