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• Applying multiple filters at once with FFMPEG

  9 mars 2017, par Parziphal

  I have the need to apply fadein and overlay filters to a video. Is it possible to apply 2 filters at once ?

  I got :

  ffmpeg -i input.mpg -vf "movie=watermark.png [logo]; [in][logo] overlay=W-w-10:H-h-10 [out]" output.mpg

  I’m trying to add fade=in:0:20, but if I add a new -vf parameter, it will overwrite the preceding one, and if I add :

  -vf "fade=in:0:20; movie=......"

  it won’t work.

  Is this possible or do I have to run FFmpeg twice ?

• 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();
  
  ?>

• 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 !