Update README.md

Author: ypresto

README.md

@@ -3,12 +3,20 @@ android-transcoder
 
 Hardware accelerated transcoder for Android, written in pure Java.
 
+## Why?
+
+Android does not offer straight forward way to transcode video.
+
+FFmpeg is the most famous solution for transcoding. But using [FFmpeg binary on Android](https://github.com/WritingMinds/ffmpeg-android) can cause GPL and/or patent issues. Also using native code for Android development can be troublesome because of cross-compiling, architecture compatibility, build time and binary size.
+
+To transcode without any hassle written above, I created this library to provide hardware accelerated transcoding of H.264 (mp4) video without ffmpeg by using [MediaCodec](https://developer.android.com/intl/ja/reference/android/media/MediaCodec.html).
+
 ## Requirements
 
 API Level 18 (Android 4.3, JELLY_BEAN_MR2) or later.
 If your app targets older Android, you should add below line to AndroidManifest.xml:
 
-```
+```xml
 <!-- Only supports API >= 18 -->
 <uses-sdk tools:overrideLibrary="net.ypresto.androidtranscoder" />
 ```
@@ -17,7 +25,7 @@ Please ensure checking Build.VERSION by your self.
 
 ## Usage
 
-```
+```java
 @Override
 protected void onActivityResult(int requestCode, int resultCode, Intent data) {
     ParcelFileDescriptor parcelFileDescriptor = resolver.openFileDescriptor(data.getData(), "r");
@@ -52,13 +60,13 @@ See `TranscoderActivity.java` in example directory for ready-made transcoder app
 
 Available from [JCenter](https://bintray.com/bintray/jcenter), which is default repo of gradle script generated by recent android studio.
 
-```
+```groovy
 repositories {
    jcenter()
 }
 ```
 
-```
+```groovy
 compile 'net.ypresto.androidtranscoder:android-transcoder:0.1.10'
 ```
 
@@ -73,7 +81,7 @@ Use [qtfaststart-java](https://github.com/ypresto/qtfaststart-java) to place moo
 ## License
 
 ```
-Copyright (C) 2014-2015 Yuya Tanaka
+Copyright (C) 2014-2016 Yuya Tanaka
 
 Licensed under the Apache License, Version 2.0 (the "License");
 you may not use this file except in compliance with the License.