Python Multimedia

Book Image

Python Multimedia

By : Ninad Sathaye

Book Image

Python Multimedia

By: Ninad Sathaye

Overview of this book

Multimedia applications are used by a range of industries to enhance the visual appeal of a product. This book will teach the reader how to perform multimedia processing using Python. This step-by-step guide gives you hands-on experience for developing exciting multimedia applications using Python. This book will help you to build applications for processing images, creating 2D animations and processing audio and video. Writing applications that work with images, videos, and other sensory effects is great. Not every application gets to make full use of audio/visual effects, but a certain amount of multimedia makes any application a lot more appealing. There are numerous multimedia libraries for which Python bindings are available. These libraries enable working with different kinds of media, such as images, audio, video, games, and so on. This book introduces the reader to the most widely used open source libraries through several exciting, real world projects. Popular multimedia frameworks and libraries such as GStreamer,Pyglet, QT Phonon, and Python Imaging library are used to develop various multimedia applications.

Python Multimedia Beginner's Guide

Python Multimedia Beginner's Guide

Credits

About the Author

About the Author

About the Reviewers

About the Reviewers

Preface

Free Chapter

Python and Multimedia

Python and Multimedia

Multimedia processing

Built-in multimedia support

External multimedia libraries and frameworks

Time for action – a simple application using PyGame

Working with Images

Working with Images

Installation prerequisites

Reading and writing images

Time for action – image file converter

Time for action – creating a new image containing some text

Time for action – reading images from archives

Basic image manipulations

Time for action – resizing

Time for action – rotating

Time for action – flipping

Time for action – capture screenshots at intervals

Time for action – cropping an image

Time for action – pasting: mirror the smiley face!

Project: Thumbnail Maker

Time for action – play with Thumbnail Maker application

Time for action – generating the UI code

Time for action – connecting the widgets

Time for action – developing image processing code

Enhancing Images

Enhancing Images

Installation and download prerequisites

Adjusting brightness and contrast

Time for action – adjusting brightness and contrast

Tweaking colors

Time for action – swap colors within an image!

Time for action – change the color of a flower

Time for action – blending two images

Creating transparent images

Time for action – create transparency

Making composites with image mask

Time for action – making composites with image mask

Project: Watermark Maker Tool

Time for action – Watermark Maker Tool

Applying image filters

Time for action – smoothing an image

Time for action – detecting and enhancing edges

Time for action – embossing

Adding a border

Time for action – enclosing a picture in a photoframe

Fun with Animations

Fun with Animations

Installation prerequisites

A primer on Pyglet

Animations with Pyglet

Time for action – viewing an existing animation

Time for action – animation using a sequence of images

Time for action – bouncing ball animation

Time for action – a simple bowling animation

Time for action – raindrops animation

Project: drive on a rainy day!

Time for action – drive on a rainy day!

Working with Audios

Working with Audios

Installation prerequisites

A primer on GStreamer

Time for action – playing an audio: method 1

Time for action – playing an audio: method 2

Converting audio file format

Time for action – audio file format converter

Extracting part of an audio

Time for action – MP3 cutter!

Time for action – recording

Audio Controls and Effects

Audio Controls and Effects

Controlling playback

Time for action – pause and resume a playing audio stream

Time for action – MP3 cutter from basic principles

Adjusting volume

Time for action – adjusting volume

Time for action – fading effects

Time for action – adding echo effect

Project: combining audio clips

Time for action – creating custom audio by combining clips

Time for action – mixing audio tracks

Visualizing an audio track

Time for action – audio visualizer

Working with Videos

Working with Videos

Installation prerequisites

Playing a video

Time for action – video player!

Video format conversion

Time for action – video format converter

Video manipulations and effects

Time for action – resize a video

Time for action – crop a video

Adding text and time on a video stream

Time for action – overlay text on a video track

Separating audio and video tracks

Time for action – audio and video tracks

Mixing audio and video tracks

Time for action – audio/video track mixer

Saving video frames as images

Time for action – saving video frames as images

GUI-based Media Players Using QT Phonon

GUI-based Media Players Using QT Phonon

Installation prerequisites

Introduction to QT Phonon

Project: GUI-based music player

Time for action – generating the UI code

Time for action – connecting the widgets

Time for action – developing the audio player code

Project: GUI-based video player

Time for action – generating the UI code

Time for action – developing the video player code

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Time for action – mixing audio tracks

Let's write a utility that can mix two audio streams together.

Download the file AudioMixer.py which contains the source code for this utility.

Now we will review the constructPipeline method. The API method gst.parse_launch() explained in the previous chapter will be used here.

1  def constructPipeline(self):
2      audio1_str = (" filesrc location=%s ! "
3      "decodebin ! audioconvert ! " 
4      % (self.inFileLocation_1) )
5
6      audio2_str = ( " filesrc location=%s "
7      "! decodebin ! audioconvert ! "
8      %(self.inFileLocation_2) )
9
10     interleave_str = ( "interleave name=mix ! "
11     " audioconvert ! lame ! "
12     " filesink location=%s"%self.outFileLocation )
13
14     queue_str = " ! queue ! mix."
15
16     myPipelineString = (
17         interleave_str + audio1_str + queue_str + 
18         audio2_str + queue_str )
19
20     self.pipeline = gst.parse_launch(myPipelineString)

The audio1_str and audio2_str are the portions of the...