Question

I am trying to create a 3gp video file by combining an mp3 audio clip and an image for my android application. That is:
mp3 + image = 3gp video clip.

I did so much research on this but found that help available was limited.

Please let me know how to do this.

Answer 1

If you are looking to do that outside of your application then check out this post which gives ffmpeg command that can be used to achieve the same.

Also ffmpeg can also be compiled for android and used using the JNI as discussed in this post.

copying the best answer for quick reference:

Here are the steps I went through in getting ffmpeg to work on Android:

1. Build static libraries of ffmpeg for Android. This was achieved by
   building olvaffe’s ffmpeg android port (libffmpeg) using the Android
   Build System. Simply place the sources under /external and make
   away. You’ll need to extract bionic(libc) and zlib(libz) from the
   Android build as well, as ffmpeg libraries depend on them.
2. Create a dynamic library wrapping ffmpeg functionality using the
   Android NDK. There’s a lot of documentation out there on how to work with the
   NDK. Basically you’ll need to write some C/C++ code to export the
   functionality you need out of ffmpeg into a library java can
   interact with through JNI. The NDK allows you to easily link against
   the static libraries you’ve generated in step 1, just add a line
   similar to this to Android.mk: LOCAL_STATIC_LIBRARIES := libavcodec
libavformat libavutil libc libz
3. Use the ffmpeg-wrapping dynamic library from your java sources. There’s enough documentation on JNI out there, you should be fine.

Regarding using ffmpeg for playback, there are many examples (the ffmpeg binary itself is a good example), here’s a basic tutorial. The best documentation can be found in the headers.