Android上的FFmpeg命令行

Question

I´m trying to use this ffmpeg command line on Android:

ffmpeg -i /sdcard/DCIM/video.mp4 -s 480x320 /sdcard/output.mp4

I have the executable file of ffmpeg (on this path: /data/local/tmp/ffmpeg/ with chmod 751), and as I read, I´m trying to invoke it using:

Runtime.getRuntime().exec("/data/local/tmp/ffmpeg -i /sdcard/DCIM/video.mp4 -s 480x320 /sdcard/output.mp4");

But I´m not getting any result after this calling, so I tried the same command but using the android terminal and I´m sure ffmpeg works because I ´m getting many outputs like video data. But it doesn´t do the action I want, I´m getting this message:

Unable to find a suitable output format for '/sdcard/output.mp4'

I don´t have any idea about what it can be the issue... Thanks for help!!

Answer 1

It probably shouldn't work because ffmpeg will refer to /usr/lib where will look for installed libs. But this is android this approach won't work.

Probably you should compile ffmpeg into a single library like libffmpeg.so and write c - wrapper, which will load it from your app location like /data/data/com.myapp/lib/libffmpeg.so and pass params to this library.

So: You will load your wrapper through jni and pass ffmpeg params then wrapper will load actual ffmpeg and pass params to it.

I have tried this in one project, it works