Cross Compiling FFmpeg with x264 for Android

Recently we were working on a feature where we had to combine an image and audio to create a video on mobile devices. In iOS this can be done using AVAssetExportSessionthough - for detail see this link However, we could not find any native solution for this problem in Android.

FFmpeg is one such tool to tackle this problem but it is not available for Android officially. We tried few existing Android ports of FFmpeg but they were either outdated or didn’t work for us. So we planned to fold our sleeves and compile the library for Android.

Compiling libraries on Linux system is a fairly common task, download the source code of the library and run three commands:

make install

As we wanted to use the FFmpeg library on Android devices, we can't just use the executable generated on the Linux machine directly because Android devices have different CPU architecture, different instruction sets and modified Linux kernel (OS). So we needed to cross compile FFmpeg library for Android

Cross Compilation ?

The process of building executable binaries on one machine, and running them on another machine when the CPU architecture or the Operating System are different is called "cross compilation".

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Expense Tracking Made Easy with Our Android Application – Expense Tracker

Most of us are oblivious of our spending behavior and more often than not end up asking questions like ‘How can I improve my spending habits’? Or ‘how can I hold back unwanted expenses’? Let’s accept it, mainstream population is unmindful of their spending behavior and typically end up overspending (of course some people claim to know where their money is going). It is difficult to fully dispute this claim, but there is a fair degree of skepticism. None of us is a human calculator after all (unless you are not using a traditional pen and paper approach for your book-keeping).

The truth is, without proper analysis we only have a vague sense of where our money goes and this where the real need of an expense tracking mechanism becomes essential.  Needless to say, not just any expense tracking application would do. It can be argued that there are many ways to track expenses and one should pick the one that suits the requirements. But at the same time the method should be hassle free and not cumbersome or time consuming. And there is no better way to be able to track your expense on your mobile while you are ‘On the Go’.

After having used a variety of Android applications for expense tracking and management, we were itching to develop our own version of an expense tracking and management app, as we felt there were many apps that lacked user friendly UI, ease of use, were over burdened with features, etc.

What we are able to achieve with our Android application is a simple, clutter free, intuitive yet powerful expense tracking application that addresses the need for monitoring daily expenses.

The application is out in the Android Marketplace and into the hands of many people with Android devices wanting an easy way to track and manage their expenses.

About Expense Tracker and Features

Expense tracking ‘On the Go’ becomes a whole lot easier with this easy to use, intuitive and simple daily expense management application. ‘Expense Tracker’ helps you to manage your money 7 days a week, 24 hours a day.

Expense Tracker Expense TrackerExpense Tracker

Just as the expenses do not stop, neither should money management. And with money being a limited commodity (for most of us), it is important to use it judiciously. ‘Expense Tracker’ is developed to help everyone who has the need for financial management and that includes everyone who indulges in economic activity of any nature.


1)    Set reminder for expense entries
2)    Track exp on daily, weekly, monthly and yearly basis
3)    Graphical representation
4)    Mark expense entries as favorite and later add it as an expense from favorite
5)    Take a picture of the expense receipt and save it for future reference
6)    Save expense as voice recording
7)    Log location of the expense automatically
8)    Date and time of the expense is logged automatically
9)    Expenses can be modified to a previous date

What every iphone developer ought to know about Google's Android platform ?

I think Android is an undiscovered Gold mine for mobile app developers who want to build sustainable business.

1. Not just for smart phones : We are moving towards machines that will be somewhere between Smartphone, Netbook and PC. We have recently seen tremendous growth in netbooks. Freescale has announced that they are going to launch $100 netbooks based on Google's Android operating system.

2. Android is Open Source - Let's look at recent history of operating systems for desktops. We had Windows and then Linux and lately Ubuntu emerged and challenged the basic notion of people whose previous experience has been dealing mainly in proprietary product. We are going to see the same kind of polarity shift in mobile application with iphone being the major player with huge growth opportunity in open source system like Android.

3. Open Handset Alliance: There are 20+ members of Open Handset Alliance that are behind Android Operating System. HTC has just announced a keyboard-less phone based on Android. We should expect some more handsets coming out this year. I think its too early to assume that Android is  not so exciting or successful.

4.  Money - All the apps available in the Android Market have been free. This has prevented  developers from creating applications for the Android platform. Android Market is now accepting paid applications from US and UK developers. Unlike on the App Store for Apple's iPhone, developers don't need to get their products approved by Google or by service providers. With the Android Market, developers get 70 percent of revenue from each software purchase, with the remaining amount going to carriers . Google does not take a percentage but they use their own payment system , Google checkout.

I believe iphone is a great platform(and I love it) but we dont want to put all our eggs in one basket.