java.io.ioexception.Runtime.getRuntime().exec(). environment and working directory null error in android

Question

File dir = new File("/mnt/sdcard");
Process process = Runtime.getRuntime().exec("ffmpeg -f image2 -i img%4d.png video.mp4", null, dir);

when i try this line in android,i get environment and working directory null error in android. But when i try that line in java,it worked perfectly.but in android,it has some problem.

You can't access any directory outside Android source. Reason see here — Mohammed Azharuddin Shaikh
– Mohammed Azharuddin Shaikh, Commented Oct 20, 2012 at 5:26
@hotveryspicy The word 'source' does not appear in that link. What are you talking about? — user207421
– user207421, Commented Oct 20, 2012 at 9:16
@EJP What I saw earlier, OP asking about using resource of PC( ie. C:\,D:\ ) so I mean that you aren't able to access external resource. — Mohammed Azharuddin Shaikh
– Mohammed Azharuddin Shaikh, Commented Oct 20, 2012 at 9:37

Community · Accepted Answer · 2020-06-20 09:12:55Z

3

i get environment and working directory null

It will return null because there is not path like /mmt/sdcard instead use /mnt/sdcard.

enter image description here

It will be best if you use Environment.getExternalStorageDirectory().

edited Jun 20, 2020 at 9:12

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answered Oct 20, 2012 at 5:43

Mohammed Azharuddin Shaikh

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1 Comment

Alex Cohn Over a year ago

/sdcard is a synonym to /mnt/sdcard, but you are right that it is strongly recommended to use Environment.getExternalStorageDirectory(). But the problem is not with this.

MAC · Accepted Answer · 2012-10-20 06:39:33Z

2

Because there is no drive like E: in your either Emulator or Device.

You can't access any drives of your PC in android like this.

EDIT :

File dir = Environment.getExternalStoragePublicDirectory();
File f = new File(dir."Yourfilename.png");

edited Oct 20, 2012 at 6:39

answered Oct 20, 2012 at 5:26

MAC

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rams Over a year ago

ok when i put the line as directory File dir = new File("/mmt/sdcard"); it will produced the environment null error in android.is there any environment,to use ffmpeg commandline...

Alex Cohn · Accepted Answer · 2012-10-20 13:21:29Z

1

Android security does not allow launching executables from sdcard or usb memory.

You can deploy the executable in your app files/ directory or in globally writeable /data/local/ directory. Don't forget to chmod 777!

Instead of usung exec("cmd", env, new File("dir")) call exec("dir/cmd")

edited Oct 20, 2012 at 13:21

answered Oct 20, 2012 at 13:15

Alex Cohn

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Comments

Kurtymckurt · Accepted Answer · 2012-10-20 05:29:12Z

0

Android probably doesn't have an E drive, in fact I can guarantee it. Android has a linux operating system and doesn't use the same drive naming convention. Also, I would consider using a ProcessBuilder whenever writing code that spawns processes. It has an easier time parsing command line options.

answered Oct 20, 2012 at 5:29

Kurtymckurt

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1 Comment

rams Over a year ago

ok when i change the directory as File dir = new File("/mmt/sdcard"); it will produced the environment null error in android.is there any environment,to use ffmpeg commandline?how to set environment in android?

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