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The Slip - Artworks
26 septembre 2011, par
Mis à jour : Septembre 2011
Langue : English
Type : Texte
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Cette nouvelle table est constituée des champs suivants : id_spipmotion_attente, l’identifiant numérique unique de la tâche à traiter ; id_document, l’identifiant numérique du document original à encoder ; id_objet l’identifiant unique de l’objet auquel le document encodé devra être attaché automatiquement ; objet, le type d’objet auquel (...) -
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Contribute to documentation
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Sur d’autres sites (5256)
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ProcessBuilder is not called when trying to start a process
15 juin 2022, par xnokI am trying to understand more about the ffmpeg usage in JavaCV for android studio and for said task I am trying to use ProcessBuilder. I tried writting a simple program to debug the
pb.start();Although, I am not getting a response. What I did was to start a default/empty activity and pasted the following program :

package com.example.myapplication;

import androidx.annotation.RequiresApi;
import androidx.appcompat.app.AppCompatActivity;
import java.io.BufferedReader;
import java.io.IOException;
import java.io.InputStreamReader;
import java.io.OutputStream;

import org.bytedeco.javacpp.Loader;

import android.os.Build;
import android.os.Bundle;
import android.util.Log;

public class MainActivity extends AppCompatActivity {
 static final int cols = 192;
 static final int rows = 108;
 static final String ffmpeg = Loader.load(org.bytedeco.ffmpeg.ffmpeg.class);
 static final String rtmp_url = "test.flv";
 static final String[] command = {ffmpeg,
 "-y",
 "-f", "rawvideo",
 "-vcodec", "rawvideo",
 "-pix_fmt", "bgr24",
 "-s", (Integer.toString(cols) + "x" + Integer.toString(rows)),
 "-r", "10",
 "-i", "pipe:",
 "-c:v", "libx264",
 "-pix_fmt", "yuv420p",
 "-preset", "ultrafast",
 "-f", "flv",
 rtmp_url};
 @RequiresApi(api = Build.VERSION_CODES.O)
 @Override
 protected void onCreate(Bundle savedInstanceState) {
 super.onCreate(savedInstanceState);
 setContentView(R.layout.activity_main);
 new Thread(t1).start();

 }
 private static Runnable t1 = () -> {
 Log.e("TAG", "void OnCreate called successfully!");
 ProcessBuilder pb = new ProcessBuilder(command).redirectErrorStream(true);
 pb.redirectErrorStream(true);
 try {
 Process process = pb.start();
 BufferedReader reader = new BufferedReader(new InputStreamReader(process.getInputStream()));
 OutputStream writer = process.getOutputStream();
 Log.e("TAG", "Something good happened here");
 } catch (IOException e) {
 e.printStackTrace();
 Log.e("TAG", "Nothing good happened here");
 }
 };


}


My current problem is that I can't seem to start properly the processBuilder process via pb.start() ;


I get the following logs from the logcat panel :


2022-06-14 17:24:46.328 13371-13371/com.example.myapplication E/TAG: void OnCreate called successfully!
2022-06-14 17:24:46.333 13371-13371/com.example.myapplication E/TAG: Nothing good happened here


I'd like to understand why is it skipping the try/catch block and not starting the process ?


EDIT : I made some changes as per @g00se's suggestions and I got the following stack trace from the code above :


2022-06-15 00:32:26.700 29787-29787/? E/USNET: USNET: appName: com.example.myapplication
2022-06-15 00:32:29.328 29787-29828/com.example.myapplication E/TAG: void OnCreate called successfully!
2022-06-15 00:32:29.330 29787-29828/com.example.myapplication E/AndroidRuntime: FATAL EXCEPTION: Thread-4
 Process: com.example.myapplication, PID: 29787
 java.lang.NullPointerException
 at java.lang.ProcessBuilder.start(ProcessBuilder.java:1012)
 at com.example.myapplication.MainActivity.lambda$static$0(MainActivity.java:48)
 at com.example.myapplication.MainActivity$$ExternalSyntheticLambda0.run(Unknown Source:0)
 at java.lang.Thread.run(Thread.java:920)


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