Update doc and layout

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grosroro 2012-05-30 15:07:31 +02:00
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PHP FFMpeg Recipes
==================
Recipes
=======
Initializing FFMpeg
-------------------
In the examples we will show you, we assume we work in an environnment where
FFMpeg has been initialized to ``$ffmpeg`` var ; there are two ways to
initialize the environment :
initialize the environment.
Loading FFMpeg automatically
^^^^^^^^^^^^^^^^^^^^^^^^^^^^
PHP-FFMpeg supports both ``avconv`` and legacy ``ffmpeg``. If both are installed
on your system, ``avconv`` will be loaded in priority. Please read the dedicated
chapter below if you want to load ``FFMpeg``.
Load FFMpeg automatically
^^^^^^^^^^^^^^^^^^^^^^^^^
The easiest way to initialize ``FMpeg`` it is to call the loader ; this will
look in your PATH environment variable to find ffmpeg/avconv binary :
@ -30,8 +34,8 @@ look in your PATH environment variable to find ffmpeg/avconv binary :
$ffmpeg = FFMpeg::load($logger);
.. note:: FFMpeg and FFProbe both requires a logger with gives feedback about
what's happening. By passing a NullHandler to the logger, you disable the
logging system.
what's happening. By passing a NullHandler to the logger, you will disable
the log system.
Use custom binary
@ -44,10 +48,19 @@ You can also initialize with a custom path to the binary :
<?php
$ffmpeg = new FFMpeg('/usr/local/src/ffmpeg/bin/ffmpeg', $logger);
Defining formats
----------------
Two base format interface are given by PHP-FFMpeg : ``FFMpeg\Format\Audio`` and
``FFMpeg\Format\Video``. ``Video`` is an extension of ``Audio``.
By implementing one of these interface, you're ready to encode a video.
But you format can implement more than these interfaces ; PHP-FFMpeg provides a
set of interfaces to transcode, resize and resample audio / video.
PHP-FFMpeg also provides a set of default audio and video usefull formats for
web usages.
Encode a video
^^^^^^^^^^^^^^
@ -68,11 +81,11 @@ target file `file.ogv` :
->encode($oggFormat, 'file.ogv')
->close();
.. note: ``FFmpeg`` methods always return the object itself so you can chain
.. note:: ``FFmpeg`` methods always return the object itself so you can chain
multiple methods.
Create HTML5 videos
^^^^^^^^^^^^^^^^^^^
Encode for HTML5
^^^^^^^^^^^^^^^^
PHP-FFMpeg provides three video format out of the box : HTML5 video formats.
These formats are available as these objects :
@ -106,17 +119,200 @@ These formats are available as these objects :
->encode($oggFormat, 'file.ogv')
->close();
.. note: Use PHP-MP4Box to make it compatible with pseudo stream !
.. note:: Use PHP-MP4Box to make it compatible with pseudo stream !
Create your own media type
^^^^^^^^^^^^^^^^^^^^^^^^^^
It is very easy to define the media type you want as target. All you need to
do is implement the ``FFMpeg\Format\Video`` interface
.. code-block:: php
<?php
namespace Foo\Bar;
use FFMpeg\Format\Video;
class MyFormat implements Video
{
public function getKiloBitrate()
{
return 1500;
}
public function getExtraParams()
{
return '';
}
}
$format = new MyFormat();
$ffmpeg->open('Video.mpeg')
->encode($format, 'file.mp4')
->close();
PHP-FFmpeg brings more interfaces for your video formats :
- ``FFMpeg\Format\Video\Resamplable``
- ``FFMpeg\Format\Video\Resizable``
- ``FFMpeg\Format\Video\Transcodable``
- ``FFMpeg\Format\Video\Interactive``
.. note:: You can combine these features in one video format.
Advanced media type
^^^^^^^^^^^^^^^^^^^
This section present basic usage of the different interfaces. You can combine
them in your own format.
Resizable
+++++++++
This interface provide an easy way to resize a video
The example below resizes a video by half.
.. code-block:: php
<?php
namespace Foo\Bar;
use FFMpeg\Format\Dimension;
use FFMpeg\Format\Video\Resizable;
class MyFormat implements Resizable
{
public function getComputedDimensions($originalWidth, $originalHeight)
{
return new Dimension(round($originalWidth / 2), round($originalHeight / 2));
}
}
$format = new MyFormat();
$ffmpeg->open('Video.mpeg')
->encode($format, 'file.mp4')
->close();
Resamplable
+++++++++++
This interface provide an easy way to resample a video
The example below resample the video at 15 frame per second with a keyframe
every 30 image.
.. code-block:: php
<?php
namespace Foo\Bar;
use FFMpeg\Format\Video\Resamplable;
class MyFormat implements Resamplable
{
public function getFrameRate()
{
return 15;
}
public function getGOPSize()
{
return 30;
}
}
$format = new MyFormat();
$ffmpeg->open('Video.mpeg')
->encode($format, 'file.mp4')
->close();
Interactive
+++++++++++
This interface provide a method to list available codec for the format
The example below provide a format object listing available videocodec for
flash video.
.. code-block:: php
<?php
namespace Foo\Bar;
use FFMpeg\Format\Video\Interactive;
class MyFormat implements Interactive
{
public function getVideoCodec()
{
return 'libx264';
}
public function getAvailableVideoCodecs()
{
return array('libx264', 'flv');
}
}
$format = new MyFormat();
$ffmpeg->open('Video.mpeg')
->encode($format, 'file.mp4')
->close();
Adding custom commandline options
+++++++++++++++++++++++++++++++++
If you need to add custom FFmpeg command line option, you can use the
``FFMpeg\Format\Audio::getExtraParams`` method.
As Video extends Audio, it is also available in any format.
The following example shows a getExtraParams usage for aac encoding. With the
latest FFMPeg version, aac encoding can be executed with command parameters
``-strict experimental``. Here is what happens if you do not add this extra
parameter :
.. code-block:: php
<?php
namespace Foo\Bar;
use FFMpeg\Format\Audio\Transcodable;
use FFMpeg\Format\Video;
class MyFormat implements Video, Transcodable
{
public function getAudioCodec()
{
return 'aac';
}
public function getKiloBitrate()
{
return 128;
}
public function getExtraParams()
{
return '-strict experimental';
}
}
$format = new MyFormat();
$ffmpeg->open('Video.mp4')
->encode($format, 'output-aac.mp4')
->close();
FFProbe recipes
---------------
create HTML5 videos
^^^^^^^^^^^^^^^^^^^

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@ -169,7 +169,9 @@
<div class="row-fluid">
<div class="span4">
<img src="{{ pathto('_static/img/project.png', 1) }}"/>
<div style="width:160px;margin:0 auto">
<img style="width:100%;margin:20px 0;" src="{{ pathto('_static/img/project.png', 1) }}"/>
</div>
{{ sidebar() }}
</div>
<div class="span8">

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h2{
h1, h2, h3, h4, h5, h6{
padding: 40px 0 5px;
}

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@ -90,7 +90,7 @@ Basic Usage
Recipes
-------
You'll find usefull recipes in our recipe guide
You'll find usefull recipes in our :doc:`Recipes`
Handling Exceptions
-------------------