FFmpeg4Android

FFmpeg4Android is a way your application can run FFmpeg commands,  only Java, no need for C code, or NDK.

Getting the Library and running the Demo App

1. Download FFmpgeg4Android from the Android market, and install on your device, and test your commands. 

2. To add FFMpeg support to your app:

 2.1  Add the FFMpeg4Android project library (source code) as a new Android project. you can also download the demo client source which use the FFMpeg4Android library, both are ADT projects, simply compile and run them.

 2.2 To bundle it with your app, You need to use the FFMpeg4Android project library (source code), (the demo client source is good only if you have the FFmpgeg4Android apk installed, which is not the case if you want to bundle it with your app).
In the ffmpeg4android source code you have the class com.example.DemoClient as a place holder for your code, and you can simply use it as is to run your code (with few renames and refactors).

Put your FFMpeg command in the invokeService():

remoteService.setFfmpegCommand(command);

The command is a simple String.

then, run using:

 runWithCommand(command);

Thats it!

 Commands Examples

This commands verified to work with FFMpeg4Android:

This are only some basic examples, a lot more is possible...

Video Compress:

ffmpeg -y -i /sdcard/InputFile.mp4 -s 320x240 -r 15 -aspect 3:4 -ab 12288 -vcodec mpeg4 -b 2097152 -sample_fmt s16 /sdcard/out.mp4  

Video Rotate (90 degrees cw):

ffmpeg -y -i /sdcard/videokit/in.mp4 -vf transpose=1 -s 160x120 -r 30 -aspect 4:3 -ab 48000 -ac 2 -ar 22050 -b 2097k /sdcard/video_output/out.mp4

Video Crop:

ffmpeg -y -i /sdcard/videokit/short.mp4 -vf crop=100:100:0:0 -s 320x240 -r 15 -aspect 3:4 -ab 12288 -vcodec mpeg4 -b 2097152 -sample_fmt s16 /sdcard/videokit/out.mp4 

Extract Picture from Video:

ffmpeg -y -i /sdcard/videokit/in.mp4 -an -r 1/2 -ss 00:00:00.000 -t 00:00:03 /sdcard/videokit/filename%03d.jpg

Extract Sound from Video:

ffmpeg -y -i /sdcard/videokit/in.avi -acodec copy /sdcard/videokit/out.mp3

Re-encode Audio in Video:

ffmpeg -y -i /sdcard/in.mp4 -vcodec copy -acodec libmp3lame -ab 64k -ac 2 -b 1200000 -ar 22050 /sdcard/out.mp4

Change Video Resolution:

ffmpeg -y -i /sdcard/in.mp4 -vf transpose=3 -s 320x240 -r 15 -aspect 3:4 -ab 12288 -vcodec mpeg4 -b 2097152 -sample_fmt s16 /sdcard/out.mp4

Cut time segment from Video:

ffmpeg -y -i 101_0077.MP4 -vcodec copy -acodec copy -ss 00:00:00 -t 00:00:01 out.mp4

Transcode Audio:

ffmpeg -y -i /sdcard/videokit/big.wav /sdcard/videokit/small.mp3

Streaming:

// use this command on ffmpeg4android
ffmpeg -i /sdcard/videokit/2.mpg -f mpegts udp://192.168.0.114:8090

// use this command to play the video on the target machine
ffplay -f mpegts -ast 1 -vst 0 -ar 48000 udp://192.168.0.114:8090 

The internals 
As mentioned before, FFmpeg4Android runs as an Android remote service, this service is actually a separate Android process, that encapsulate the FFmpeg native process, that runs directly on the device Linux.
The demo application command will convert vid.mp4 to vid_trans.mp4, it will rotate it 270 degrees, change its resolution to 320x240, change the aspect ratio to 3:4 and encode it with mpeg4 encoder, this is all with one command! (actually it does more, it defines the audio codec, and set the audio bit rate also). 
This is done at the native FFmpeg level, JNI is used to make the calls from the Remote service to the native FFmpeg process.

 Updates - new version - 4.0 
 This use the latest FFmpeg stable source to date, and adds libmp3lame to support mp3 encoding, so now you can easily run commands like this:

* ffmpeg -y -i /sdcard/videokit/in.wav out.mp3
This command transcode WAV file to MP3 file



* ffmpeg -y -i /sdcard/videokit/in.mp4 -vn -ar 44100 -ac 2 -ab 192 -f mp3 /sdcard/videokit/out.mp3
This command extract mp3 sound from the input video. 

Updates - new version - 5.0 

* Version 5 now support Background processing out of the box, no need to write any code for that!

*  Version 5 has streaming support,  to stream use this command: 

String command = "ffmpeg -i /sdcard/videokit/2.mpg -f mpegts udp://192.168.0.114:8090";

To get the streamed video use this on the machine you stream to (in this case 192.168.0.114):

ffplay -f mpegts -ast 1 -vst 0 -ar 48000 udp://192.168.0.114:8090

* Simplified api, all your app has to do is add the library, and with a few lines of code you have FFMpeg support

* Please note that version 5 changed FFMpeg4Android library significantly, hence, most comments below are not relevant.