599 lines
14 KiB
ReStructuredText
599 lines
14 KiB
ReStructuredText
Recipes
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=======
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Initializing FFMpeg
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-------------------
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In the following examples, we assume we work in an environnment where
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FFMpeg has been initialized to ``$ffmpeg``; there are two ways to
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initialize the environment (see below).
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PHP-FFMpeg supports both ``avconv`` and legacy ``ffmpeg``. If both are installed
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on your system, ``avconv`` will be loaded in first priority. Please read the
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dedicated chapter below if you want to load ``FFMpeg``.
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Load FFMpeg automatically
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^^^^^^^^^^^^^^^^^^^^^^^^^
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The easiest way to initialize ``FMpeg`` it is to call the loader ; this will
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look in your PATH environment variable to find ffmpeg/avconv binary :
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.. code-block:: php
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<?php
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use Monolog\Logger;
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use Monolog\Handler\NullHandler;
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use FFMpeg\FFMpeg;
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// Create a logger
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$logger = new Logger('MyLogger');
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$logger->pushHandler(new NullHandler());
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// You have to pass a Monolog logger
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// This logger provides some usefull infos about what's happening
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$ffmpeg = FFMpeg::load($logger);
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.. note:: FFMpeg and FFProbe both requires a logger for giving feedback about
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what's happening. By passing a NullHandler to the logger, you will disable
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the log system.
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Use custom binary
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^^^^^^^^^^^^^^^^^
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You can also initialize with a custom path to the binary :
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.. code-block:: php
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<?php
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$ffmpeg = new FFMpeg('/usr/local/src/ffmpeg/bin/ffmpeg', $logger);
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Formats
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-------
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PHP-FFMpeg provides a set of predefined audio and video formats. These formats
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are usefull, but you'll probably need to define your own format with their own
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resize rules, etc...
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This section describe how to use media formats, and how to define them.
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.. note:: Defining a format is just about implementing interfaces.
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.. _video-reference:
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Video
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^^^^^
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This section describes video processing and Interfaces for building video
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formats. As Video is an extension of audio, all these features can be combined
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with audio features (see :ref:`dedicated audio section<audio-reference>`).
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Simple transcoding
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++++++++++++++++++
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To transcode a video, you have to pass the target format to FFMpeg.
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The following example initialize a Ogg format and encodes a `Video.mpeg` to a
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target file `file.ogv` :
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.. code-block:: php
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<?php
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use FFMpeg\Format\Video\Ogg;
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$oggFormat = new Ogg();
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$ffmpeg->open('Video.mpeg')
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->encode($oggFormat, 'file.ogv')
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->close();
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.. note:: ``FFmpeg`` methods always return the object itself so you can chain
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multiple methods.
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HTML5
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+++++
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PHP-FFMpeg provides three video formats out of the box : HTML5 video formats
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- ``FFMpeg\Format\Video\WebM``
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- ``FFMpeg\Format\Video\X264``
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- ``FFMpeg\Format\Video\Ogg``
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.. code-block:: php
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<?php
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use FFMpeg\Format\Video;
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$webMFormat = new Video\WebM();
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$webMFormat->setDimensions(320, 240)
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->setFrameRate(15)
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->setGopSize(25);
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$x264Format = new Video\X264();
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$x264Format->setDimensions(320, 240)
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->setFrameRate(15)
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->setGopSize(25);
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$oggFormat = new Video\Ogg();
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$oggFormat->setDimensions(320, 240)
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->setFrameRate(15)
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->setGopSize(25);
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$ffmpeg->open('Video.mpeg')
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->encode($webMFormat, 'file.webm')
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->encode($x264Format, 'file.mp4')
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->encode($oggFormat, 'file.ogv')
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->close();
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.. note:: All formats provided by PHP-FFMpeg extends DefaultVideo, have a look
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at the API doc for more information on its behavior.
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.. note:: Use PHP-MP4Box to make it compatible with pseudo stream !
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Create your own media type
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++++++++++++++++++++++++++
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PHP-FFMpeg provides ``FFMpeg\Format\Video``, as base interface for creating a
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Video format. To define a target format, all you need to do is implement this
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Interface.
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.. code-block:: php
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<?php
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namespace Foo\Bar;
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use FFMpeg\Format\Video;
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class MyFormat implements Video
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{
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public function getKiloBitrate()
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{
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return 1500;
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}
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public function getExtraParams()
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{
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return '';
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}
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}
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$format = new MyFormat();
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$ffmpeg->open('Video.mpeg')
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->encode($format, 'file.mp4')
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->close();
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PHP-FFmpeg brings more interfaces for your video formats :
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- ``FFMpeg\Format\Video\Resamplable``
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- ``FFMpeg\Format\Video\Resizable``
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- ``FFMpeg\Format\Video\Transcodable``
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- ``FFMpeg\Format\Video\Interactive``
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.. note:: You can combine these features in one video format.
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Advanced media type
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+++++++++++++++++++
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This section presents usage for the different interfaces. You can combine
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them for your own formats.
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Resizable
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.........
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This interface provide an easy way to resize a video.
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The example below resizes a video by half.
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.. code-block:: php
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<?php
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namespace Foo\Bar;
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use FFMpeg\Format\Dimension;
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use FFMpeg\Format\Video\Resizable;
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class MyFormat implements Resizable
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{
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public function getComputedDimensions($originalWidth, $originalHeight)
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{
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return new Dimension(round($originalWidth / 2), round($originalHeight / 2));
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}
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}
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$format = new MyFormat();
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$ffmpeg->open('Video.mpeg')
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->encode($format, 'file.mp4')
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->close();
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Resamplable
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...........
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This interface provides video resampling. The example below resample the video
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at 15 frame per second with a I-frame every 30 image (see
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`GOP on wikipedia <https://wikipedia.org/wiki/Group_of_pictures>`_).
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.. code-block:: php
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<?php
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namespace Foo\Bar;
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use FFMpeg\Format\Video\Resamplable;
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class MyFormat implements Resamplable
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{
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public function getFrameRate()
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{
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return 15;
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}
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public function getGOPSize()
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{
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return 30;
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}
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}
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$format = new MyFormat();
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$ffmpeg->open('Video.mpeg')
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->encode($format, 'file.mp4')
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->close();
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Interactive
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...........
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This interface provides a method to list available codecs for the format.
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The example below provides a format object listing available video-codecs for
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video supported in flash player.
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.. code-block:: php
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<?php
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namespace Foo\Bar;
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use FFMpeg\Format\Video\Interactive;
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class MyFormat implements Interactive
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{
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public function getVideoCodec()
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{
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return 'libx264';
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}
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public function getAvailableVideoCodecs()
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{
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return array('libx264', 'flv');
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}
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}
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$format = new MyFormat();
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$ffmpeg->open('Video.mpeg')
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->encode($format, 'file.mp4')
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->close();
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.. _audio-reference:
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Audio
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^^^^^
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This section describes audio processing and Interfaces for building video
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formats. As Video is an extension of audio, all these features can be combined
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with video features (see :ref:`dedicated video section<video-reference>`).
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Simple transcoding
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++++++++++++++++++
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To transcode audio file or extract an audio soundtrack from a video, you have to
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pass the target format to FFMpeg.
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The following example initialize a Mp3 format and transcode the file `tune.wav`
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to `tune.mp3` :
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.. code-block:: php
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<?php
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use FFMpeg\Format\Audio\Mp3;
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$mp3Format = new Mp3();
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$ffmpeg->open('tune.wav')
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->encode($mp3Format, 'tune.mp3')
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->close();
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Extract soundtrack from movie
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+++++++++++++++++++++++++++++
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The following example initialize a Flac format and extract the audio track from
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`Video.mpeg` to a target file `soudtrack.flac` :
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.. code-block:: php
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<?php
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use FFMpeg\Format\Audio\Flac;
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$flacFormat = new Flac();
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$ffmpeg->open('Video.mpeg')
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->encode($flacFormat, 'soundtrack.flac')
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->close();
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.. note:: You must ensure that FFmpeg support the format you request, otherwise
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a FFMpeg\Exception\RuntimeException will be thrown.
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Create your own media type
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++++++++++++++++++++++++++
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PHP-FFMpeg provides ``FFMpeg\Format\Audio``, as base interface for creating an
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Audio format. To define a target format, all you need to do is implement this
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Interface.
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This example transcodes the mp3 track to a 128kb mp3 :
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.. code-block:: php
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<?php
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namespace Foo\Bar;
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use FFMpeg\Format\Audio;
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class MyFormat implements Audio
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{
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public function getKiloBitrate()
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{
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return 128;
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}
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public function getExtraParams()
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{
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return '';
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}
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}
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$format = new MyFormat();
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$ffmpeg->open('song.mp3')
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->encode($format, 'song-128.mp3')
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->close();
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PHP-FFmpeg brings more interfaces for your audio formats :
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- ``FFMpeg\Format\Audio\Resamplable``
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- ``FFMpeg\Format\Audio\Transcodable``
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- ``FFMpeg\Format\Audio\Interactive``
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.. note:: You can combine these features in one video format.
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Advanced media type
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+++++++++++++++++++
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This section presents usage for the different audio interfaces. You can combine
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them for your own formats.
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Resamplable
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...........
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This interface provides video resampling. The example below resample the video
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at 15 frame per second with a I-frame every 30 image (see
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`GOP on wikipedia <https://wikipedia.org/wiki/Group_of_pictures>`_).
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.. code-block:: php
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<?php
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namespace Foo\Bar;
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use FFMpeg\Format\Audio\Resamplable;
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class MyFormat implements Resamplable
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{
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public function getAudioSampleRate();
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{
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return 44100;
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}
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}
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$format = new MyFormat();
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$ffmpeg->open('song.mp3')
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->encode($format, 'song-44100.mp3')
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->close();
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Interactive
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...........
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This interface provides a method to list available codecs for the format.
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The example below provides a format object listing available audio-codecs for
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a portable player.
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.. code-block:: php
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<?php
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namespace Foo\Bar;
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use FFMpeg\Format\Audio\Interactive;
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class MyFormat implements Interactive
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{
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public function getAudioCodec()
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{
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return 'libvorbis';
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}
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public function getAvailableVideoCodecs()
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{
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return array('libvorbis', 'libmp3lame', 'libflac');
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}
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}
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Custom commandline options
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^^^^^^^^^^^^^^^^^^^^^^^^^^
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If you need to add custom FFmpeg command line option, use the
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``FFMpeg\Format\Audio::getExtraParams`` method.
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As ``Video`` extends ``Audio``, it is also available in any format.
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The following example shows a ``getExtraParams`` usage for aac encoding. With the
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latest AvConv / FFMPeg version, aac encoding has to be executed with extra command parameters
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``-strict experimental``.
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.. code-block:: php
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<?php
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namespace Foo\Bar;
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use FFMpeg\Format\Audio\Transcodable;
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use FFMpeg\Format\Video;
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class MyFormat implements Video, Transcodable
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{
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public function getAudioCodec()
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{
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return 'aac';
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}
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public function getKiloBitrate()
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{
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return 128;
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}
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public function getExtraParams()
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{
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return '-strict experimental';
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}
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}
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$format = new MyFormat();
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$ffmpeg->open('Video.mp4')
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->encode($format, 'output-aac.mp4')
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->close();
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FFProbe recipes
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---------------
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FFProbe / AvProbe is a usefull tool for probing media files. PHP-FFMpeg
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implementation is currenly light.
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Load FFProbe
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^^^^^^^^^^^^
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As FFMpeg, you can load FFProbe two ways ; either with the binary detector or
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specifying the binary you want to use
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.. code-block:: php
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<?php
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use Monolog\Logger;
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use Monolog\Handler\NullHandler;
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use FFMpeg\FFProbe;
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// Create a logger
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$logger = new Logger('MyLogger');
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$logger->pushHandler(new NullHandler());
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// ------------------------------------------------------------------------
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// Load with binary detection
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// You have to pass a Monolog logger
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// This logger provides some usefull infos about what's happening
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$ffprobe = FFProbe::load($logger);
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// ------------------------------------------------------------------------
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// Or load manually
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$ffprobe = new FFProbe('/usr/local/src/ffmpeg/bin/ffprobe', $logger);
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Probe streams
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^^^^^^^^^^^^^
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Probe streams returns the output of ``avprobe -show_streams`` as a json
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object.
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.. code-block:: php
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<?php
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echo $ffprobe->probeStreams('Video.ogv');
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will output something like
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.. code-block:: json
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[
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{
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"index": 0,
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"codec_name": "theora",
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"codec_long_name": "Theora",
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"codec_type": "video",
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"codec_time_base": "1/15",
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"codec_tag_string": "[0][0][0][0]",
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"codec_tag": "0x0000",
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"width": 400,
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"height": 304,
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"has_b_frames": 0,
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"pix_fmt": "yuv420p",
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"level": "-99",
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"r_frame_rate": "15/1",
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"avg_frame_rate": "15/1",
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"time_base": "1/15",
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"start_time": "0.000000",
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"duration": "29.533333"
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},
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{
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"index": 1,
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"codec_name": "vorbis",
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"codec_long_name": "Vorbis",
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"codec_type": "audio",
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"codec_time_base": "1/44100",
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"codec_tag_string": "[0][0][0][0]",
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"codec_tag": "0x0000",
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"sample_rate": "44100.000000",
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"channels": 2,
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"bits_per_sample": 0,
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"r_frame_rate": "0/0",
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"avg_frame_rate": "0/0",
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"time_base": "1/44100",
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"start_time": "0.000000",
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"duration": "29.489342",
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"TAG:TITLE": "Halo",
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"TAG:LICENSE": "http://creativecommons.org/licenses/publicdomain/",
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"TAG:LOCATION": "http://www.archive.org/details/ctvc"
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}
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]
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Probe formats
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^^^^^^^^^^^^^
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Probe format returns the output of ``avprobe -show_format`` as a json
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object.
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.. code-block:: php
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<?php
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echo $ffprobe->probeFormat('Video.ogv');
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will output something like
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.. code-block:: json
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{
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"filename": "Video.ogv",
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"nb_streams": 2,
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"format_name": "ogg",
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"format_long_name": "Ogg",
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"start_time": "0.000000",
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"duration": "29.533333",
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"size": "1786693.000000",
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"bit_rate": "483980.000000"
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}
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