I am unaware with ffmpeg, and wants to run ffmpeg command on android terminal.
What are the basic steps to configure android so that it can run ffmpeg command through android application program?
Thanking you!...
Android supports Runtime.exec() and this is the best way to run an executable (e.g. ffmpeg) programmatically.
This is the same as running on the terminal, but slightly different from running on adb shell because the latter uses a system account. On a rooted device, you can run as superuser from Java, terminal, or from adb shell.
Note that you must deploy the binary (ffmpeg) somewhere on the internal storage. Android does not allow execution from /sdcard/.
You can find many downloads of ffmpeg for Android, and build the binary with the toolchain from Android NDK (must dowload and install it). On Windows, cygwin is required. I recommend static linking of libav libraries.
Note that it's also possible to build ffmpeg as a library, and call its main() in-process, using the same parameters as the conventional command line.
Get FFmpeg executable binary and .so files from following link. They have given sample code that, how to capture video from images. I hope it will help you. Go through the link.
They move the required library files into application package.
Then they change the permission to access the package.
Next they pass the arguments to run FFmpeg.
capture video from images
Related
I have an android application containing exoplayer instance, some udp video play without sounds , so i want to add Ffmpeg extension to my project, i am working on windows system and need to follow the instructions below:
https://github.com/google/ExoPlayer/blob/release-v2/extensions/ffmpeg/README.md
So first step is Set the following shell variable:
cd ""
FFMPEG_MODULE_PATH="$(pwd)/extensions/ffmpeg/src/main"
i downloaded Git to use as power shell, so what is pwd??
PLus...
Set the host platform (use "darwin-x86_64" for Mac OS X):
HOST_PLATFORM="linux-x86_64" what is this variable in windows?
Please i am confused how to build this library manually in windows and it is not straightforward at all....
I referred to this link - Use CreateProcess to execute ADB command. The approach used in the above link requires Windows.h file which is contained in windows SDk. Since i am executing Android Studio in Mac i will not be able to get the include file. I am not sure whether the above mentioned approach can be performed using Android Studio in Mac.
You can use system or popen methods to start an adb process.
As title says, I need to extract files from .rar file and save it on device storage. There are third party tools which supports this. But I was wondering is there any adb /appium /android utility command which provides this functionality ?
There's no way to do this without using a third party tool or app. See the Android Developer reference for ADB.
If use of third party tools is not out of the question for you (you refer to Appium, after all), and you just want to be able to extract the .rar file from the command line, you might try installing an app which can extract .rar files (there are many) and access the correct activity from the command line using the activity manager. You can view the activities available to you for a given APK using the Android Asset Packaging Tool and this command:
aapt dump xmltree <path to APK> AndroidManifest.xml
I would install busybox on your device. This will give you all the commands needed to allow for unzipping the files on your phone. Just disable auto update if you are worried about the application updating.
I have C Linux based application and now I want to port it to Android.
I figured out, that I can extract the toolchain from Android NDK and build my application, but how to make the APK such that I can install it on the android devices without the need of root access.
In Linux, I used to install it using a bash script which used to put my application related files in different folders like /opt, /etc (files shared with other applications) and /var . How can we handle this in Android. Is there a folder similar to /etc in Android where I can put files that other applications can read.
Thanks
-M
First of all, you are lucky if your project compiles "as is" with NDK standalone toolchain. Often, bionic is not enough, and people need to tweak the build environment (from libpthread to full-blown buildroot alternate toolchain with static C runtime).
As for the shared files location, on Android it's named "external storage". Your app and other app may require special permissions to write and read to this location. Directory /opt does not exist here. You don't have write access to /etc, but files like /etc/hosts are available for read.
Regarding the APK. You are right, this is the ultimate way to distribute and install apps on Android. But you can, even without root, to locally install and run a command-line executable. Usually it's done with Developers Options turned on, and enabled USB debugging. Now you can open an adb shell, install and run your program. The trick is that external storage (see above) is marked as 'non-executable'. Therefore, you must find another place for your binary. Usually, /data/local/tmp will be a good choice.
Instead of adb, you can use a terminal emulator on the device.
If you choose to build an APK, you will probably prefer to convert your app to shared library that will perform actions for Java via JNI. But it is also possible to package your command-line binary as part of the APK and use Java Runtime.exec().
I don't know whether i make sense or not. But just wanted to now that can i run the c/c++ code in android without the need of writing JNI wrapper or using Native Activity way?
I mean, I am having a simple C++ Template Matching code which contains main function and I use to run it using g++ in terminal.
Now I want this Template Matching code to be run in android usng NDK. Is there any way? I have googled a lot but all they is to either use JNI wrapper or use SWIG which makes JNI wrapper, but can't actually get into any of them. I need more simpler solution.
If you have a rooted phone, you can compile and run programs as on any linux machine, from the adb shell.
However, that requires a bit of knowledge about Linux.
So, to start:
Root your phone (force it to give you admin privileges). That is easy for developer phones/boards, and a kill for regular phones bought at a shop downstreet.
compile your app for android and run it from adb as you would do from a linux shell.
Here is a more detailed answer on the matter
How to compile C into an executable binary file and run it in Android from Android Shell?