PHP-FFMpeg前提条件

Question

I'm attempting to implement https://github.com/PHP-FFMpeg/PHP-FFMpeg

I copied the src/FFMpeg folder to my includes folder and made sure my autoloader knows where to find everything.

as a test I made a script that simply does:

 
 
 
 
  
  
  $ffmpeg = FFMpeg\\FFMpeg::create(); $video = $ffmpeg->open('video.mpg');
 
 
  

I get:

 
 
 
 
  
  
  Fatal error: Class 'Doctrine\\Common\\Cache\\ArrayCache' not found in /var/www/php/include/FFMpeg/FFProbe.php on line 203
 
 
  

My question is: does PHP-FFMPeg require Doctrine, because that is not stated in the documentation. What version do I need? Are there other prerequisites?

I could create a new question for this, but I'm not sure if I should. I now have PHP-ffmpeg implemented. I'm using Laravel, however that should be irrelevant for this question. I'm trying to enable progress monitoring. It works, however I need to pass in an ID so I can update the correct key in memcache.

 $id = 12345; $format->on('progress', function ($audio, $format, $percentage) { //this works perfect, but doesn't tell me which item is being updated Cache::put("progress", $percentage, .25); //this does not work as I am unable to pass in $id, if I add it as the 4th argument above it will display the number of threads or something //Cache::put("{$id}_progress", $percentage, .25); }); 

I need clarification on the "on" method. I looked through https://ffmpeg-php.readthedocs.org/en/latest/_static/API/ and was not able to figure out how this method works. Any help would be appreciated.

Answer 1

You should follow the recommended instructions in the README .

Composer is the easiest way to install PHP-FFMpeg dependencies

The "on" method called on the format is an implementation of EventEmitter. As you can see here : https://ffmpeg-php.readthedocs.org/en/latest/_static/API/FFMpeg/Format/ProgressableInterface.html it extends the EventEmitterInterface of https://github.com/igorw/evenement .

If you're really interested about how it works under the hood, have a look at here : The progress listener is created here : https://github.com/PHP-FFMpeg/PHP-FFMpeg/blob/master/src/FFMpeg/Format/Audio/DefaultAudio.php#L96 and added at execution here https://github.com/PHP-FFMpeg/PHP-FFMpeg/blob/master/src/FFMpeg/Media/Video.php#L151 This is actually possible because FFMpegDriver extends the Driver provided by https://github.com/alchemy-fr/BinaryDriver

Hope this helps :)