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  • Book Overview & Buying Python Multimedia
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Python Multimedia

Python Multimedia

By : Ninad Sathaye
3 (3)
Buy this Book
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Python Multimedia

Python Multimedia

3 (3)
By: Ninad Sathaye
Buy this Book

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.
Table of Contents (13 chapters)
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Python Multimedia Beginner's Guide
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Python Multimedia Beginner's Guide
Credits
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Credits
About the Author
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About the Author
About the Reviewers
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About the Reviewers
Preface
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Preface
Lock Free Chapter
1
Python and Multimedia
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Python and Multimedia
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Multimedia
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Multimedia processing
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Built-in multimedia support
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External multimedia libraries and frameworks
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Time for action – a simple application using PyGame
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Summary
2
Working with Images
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Working with Images
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Installation prerequisites
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Reading and writing images
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Time for action – image file converter
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Time for action – creating a new image containing some text
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Time for action – reading images from archives
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Basic image manipulations
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Time for action – resizing
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Time for action – rotating
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Time for action – flipping
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Time for action – capture screenshots at intervals
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Time for action – cropping an image
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Time for action – pasting: mirror the smiley face!
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Project: Thumbnail Maker
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Time for action – play with Thumbnail Maker application
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Time for action – generating the UI code
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Time for action – connecting the widgets
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Time for action – developing image processing code
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Summary
3
Enhancing Images
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Enhancing Images
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Installation and download prerequisites
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Adjusting brightness and contrast
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Time for action – adjusting brightness and contrast
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Tweaking colors
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Time for action – swap colors within an image!
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Time for action – change the color of a flower
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Blending
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Time for action – blending two images
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Creating transparent images
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Time for action – create transparency
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Making composites with image mask
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Time for action – making composites with image mask
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Project: Watermark Maker Tool
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Time for action – Watermark Maker Tool
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Applying image filters
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Time for action – smoothing an image
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Time for action – detecting and enhancing edges
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Time for action – embossing
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Adding a border
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Time for action – enclosing a picture in a photoframe
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Summary
4
Fun with Animations
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Fun with Animations
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Installation prerequisites
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A primer on Pyglet
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Animations with Pyglet
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Time for action – viewing an existing animation
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Time for action – animation using a sequence of images
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Time for action – bouncing ball animation
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Time for action – a simple bowling animation
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Time for action – raindrops animation
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Project: drive on a rainy day!
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Time for action – drive on a rainy day!
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Summary
5
Working with Audios
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Working with Audios
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Installation prerequisites
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A primer on GStreamer
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Playing music
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Time for action – playing an audio: method 1
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Time for action – playing an audio: method 2
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Converting audio file format
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Time for action – audio file format converter
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Extracting part of an audio
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Time for action – MP3 cutter!
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Recording
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Time for action – recording
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Summary
6
Audio Controls and Effects
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Audio Controls and Effects
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Controlling playback
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Time for action – pause and resume a playing audio stream
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Time for action – MP3 cutter from basic principles
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Adjusting volume
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Time for action – adjusting volume
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Audio effects
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Time for action – fading effects
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Time for action – adding echo effect
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Project: combining audio clips
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Time for action – creating custom audio by combining clips
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Audio mixing
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Time for action – mixing audio tracks
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Visualizing an audio track
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Time for action – audio visualizer
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Summary
7
Working with Videos
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Working with Videos
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Installation prerequisites
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Playing a video
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Time for action – video player!
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Video format conversion
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Time for action – video format converter
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Video manipulations and effects
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Time for action – resize a video
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Time for action – crop a video
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Adding text and time on a video stream
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Time for action – overlay text on a video track
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Separating audio and video tracks
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Time for action – audio and video tracks
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Mixing audio and video tracks
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Time for action – audio/video track mixer
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Saving video frames as images
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Time for action – saving video frames as images
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Summary
8
GUI-based Media Players Using QT Phonon
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GUI-based Media Players Using QT Phonon
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Installation prerequisites
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Introduction to QT Phonon
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Project: GUI-based music player
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Time for action – generating the UI code
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Time for action – connecting the widgets
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Time for action – developing the audio player code
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Project: GUI-based video player
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Time for action – generating the UI code
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Time for action – developing the video player code
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Summary

Time for action – adding echo effect

Let's write code to add an echo effect to an input audio. The code is very similar to the one in the AudioEffects.py file discussed in earlier section. Just to simplify the matter, we will use the code in file EchoEffect.py file for easier understanding. Later, you can easily integrate this with the code in AudioEffects.py.

  1. Download the file EchoEffect.py that has the source code to add audio echo effect. The file contains class AudioEffects whose constructor has the following code.

    def __init__(self):
    self.is_playing = False
    # Flag used for printing purpose only.
    self.error_msg = ''

    #the flag that determines whether to use
    # a gst Controller object to adjust the
    # intensity of echo while playing the audio.
    self.use_echo_controller = False

    self.inFileLocation = "C:/AudioFiles/audio1.mp3"
    self.outFileLocation = "C:/AudioFiles/audio1_out.mp3"

    self.constructPipeline()
    self.connectSignals()

    It is similar to the...

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