Created a Java w/ Maven project structure; added a simple directory creation and executes an FFMPEG command to transcode videos

.gitignore

@@ -1,23 +1,5 @@
-# ---> Go
+.classpath
-# If you prefer the allow list template instead of the deny list, see community template:
+.project
-# https://github.com/github/gitignore/blob/main/community/Golang/Go.AllowList.gitignore
+.settings/
-#
+target/
-# Binaries for programs and plugins
+.idea/
-*.exe
-*.exe~
-*.dll
-*.so
-*.dylib
-
-# Test binary, built with `go test -c`
-*.test
-
-# Output of the go coverage tool, specifically when used with LiteIDE
-*.out
-
-# Dependency directories (remove the comment below to include it)
-# vendor/
-
-# Go workspace file
-go.work
-

LICENSE

@@ -1,4 +1,4 @@
-Copyright (c) <year> <owner> 
+Copyright (c) 2022, Bit Goblin
 
 Redistribution and use in source and binary forms, with or without modification, are permitted provided that the following conditions are met:
 

pom.xml

@@ -0,0 +1,86 @@
+<?xml version="1.0" encoding="UTF-8"?>
+
+<project xmlns="http://maven.apache.org/POM/4.0.0" xmlns:xsi="http://www.w3.org/2001/XMLSchema-instance"
+  xsi:schemaLocation="http://maven.apache.org/POM/4.0.0 http://maven.apache.org/xsd/maven-4.0.0.xsd">
+  <modelVersion>4.0.0</modelVersion>
+
+  <groupId>tech.bitgoblin</groupId>
+  <artifactId>Dragoon</artifactId>
+  <version>0.1.0</version>
+
+  <name>Dragoon</name>
+  <url>https://www.bitgoblin.tech</url>
+
+  <properties>
+    <project.build.sourceEncoding>UTF-8</project.build.sourceEncoding>
+    <maven.compiler.source>11</maven.compiler.source>
+    <maven.compiler.target>11</maven.compiler.target>
+  </properties>
+
+  <dependencies>
+    <dependency>
+      <groupId>junit</groupId>
+      <artifactId>junit</artifactId>
+      <version>4.11</version>
+      <scope>test</scope>
+    </dependency>
+  </dependencies>
+
+  <build>
+    <pluginManagement><!-- lock down plugins versions to avoid using Maven defaults (may be moved to parent pom) -->
+      <plugins>
+        <!-- clean lifecycle, see https://maven.apache.org/ref/current/maven-core/lifecycles.html#clean_Lifecycle -->
+        <plugin>
+          <artifactId>maven-clean-plugin</artifactId>
+          <version>3.1.0</version>
+        </plugin>
+        <!-- default lifecycle, jar packaging: see https://maven.apache.org/ref/current/maven-core/default-bindings.html#Plugin_bindings_for_jar_packaging -->
+        <plugin>
+          <artifactId>maven-resources-plugin</artifactId>
+          <version>3.0.2</version>
+        </plugin>
+        <plugin>
+          <artifactId>maven-compiler-plugin</artifactId>
+          <version>3.8.0</version>
+        </plugin>
+        <plugin>
+          <artifactId>maven-surefire-plugin</artifactId>
+          <version>2.22.1</version>
+        </plugin>
+        <plugin>
+          <artifactId>maven-jar-plugin</artifactId>
+          <version>3.0.2</version>
+          <configuration>
+  				  <!-- DO NOT include log4j.properties file in your Jar -->
+  				  <excludes>
+  					  <exclude>**/log4j.properties</exclude>
+  				  </excludes>
+  				  <archive>
+    					<manifest>
+    						<!-- Jar file entry point -->
+    						<mainClass>tech.bitgoblin.App</mainClass>
+    					</manifest>
+  				  </archive>
+  				</configuration>
+        </plugin>
+        <plugin>
+          <artifactId>maven-install-plugin</artifactId>
+          <version>2.5.2</version>
+        </plugin>
+        <plugin>
+          <artifactId>maven-deploy-plugin</artifactId>
+          <version>2.8.2</version>
+        </plugin>
+        <!-- site lifecycle, see https://maven.apache.org/ref/current/maven-core/lifecycles.html#site_Lifecycle -->
+        <plugin>
+          <artifactId>maven-site-plugin</artifactId>
+          <version>3.7.1</version>
+        </plugin>
+        <plugin>
+          <artifactId>maven-project-info-reports-plugin</artifactId>
+          <version>3.0.0</version>
+        </plugin>
+      </plugins>
+    </pluginManagement>
+  </build>
+</project>

src/main/java/tech/bitgoblin/App.java

@@ -0,0 +1,17 @@
+package tech.bitgoblin;
+
+import tech.bitgoblin.video.Transcoder;
+
+/**
+ * The Bit Goblin video transcoder service.
+ *
+ */
+public class App {
+
+  public static void main(String[] args) {
+    // create new Transcoder object and start the service
+    Transcoder t = new Transcoder("~/dragoon");
+    t.transcode();
+  }
+
+}

src/main/java/tech/bitgoblin/io/IOUtils.java

@@ -0,0 +1,27 @@
+package tech.bitgoblin.io;
+
+import java.io.File;
+
+public class IOUtils {
+
+  public static void createDirectory(String path) {
+    File f = new File(path);
+    boolean res = f.mkdir();
+
+    if (res) {
+      System.out.println(path + " was created.");
+    }
+  }
+
+  public static String resolveTilda(String path) {
+    if (path.startsWith("~" + File.separator)) {
+      path = System.getProperty("user.home") + path.substring(1);
+    } else if (path.startsWith("~")) {
+      // here you can implement reading homedir of other users if you care
+      throw new UnsupportedOperationException("Home dir expansion not implemented for explicit usernames");
+    }
+
+    return path;
+  }
+
+}

src/main/java/tech/bitgoblin/video/Transcoder.java

@@ -0,0 +1,102 @@
+package tech.bitgoblin.video;
+
+import java.io.BufferedReader;
+import java.io.File;
+import java.io.InputStream;
+import java.io.InputStreamReader;
+import java.io.IOException;
+import java.lang.InterruptedException;
+import java.lang.Process;
+import java.nio.file.Path;
+import java.nio.file.Paths;
+import java.util.function.Consumer;
+import java.util.concurrent.Executors;
+
+import tech.bitgoblin.io.IOUtils;
+
+public class Transcoder {
+
+  private String repo_dir;
+  private String ffmpeg_path = "/usr/bin/ffmpeg";
+
+  // only define the working directory; use default FFMPEG path
+  public Transcoder(String repo_dir) {
+    this.repo_dir = IOUtils.resolveTilda(repo_dir);
+    this.initDirectory();
+  }
+  // define a custom FFMPEG binary path
+  public Transcoder(String repo_dir, String ffmpeg_path) {
+    this.repo_dir = IOUtils.resolveTilda(repo_dir);
+    this.ffmpeg_path = ffmpeg_path;
+    this.initDirectory();
+  }
+
+  // transcode files in the working directory
+  public void transcode() {
+    // search for files
+    System.out.println("Searching for files to transcode in " + this.repo_dir);
+    File repo = new File(Paths.get(this.repo_dir, "ingest").toString());
+    File[] sourceFiles = repo.listFiles();
+
+    // transcode
+    System.out.println("Transcoding files in " + this.repo_dir + "/ingest...");
+    for (File f : sourceFiles) {
+      String filePath = f.toString().substring(0, f.toString().lastIndexOf("."));
+      String filename = Paths.get(filePath).getFileName().toString();
+      String outputPath = Paths.get(this.repo_dir, "output", String.format("%s.mov", filename)).toString();
+
+      String cmd = String.format("%s -i %s -c:v %s -vf \"%s\" -profile:v %s -c:a %s %s",
+        this.ffmpeg_path, // FFMPEG binary path
+        f.toString(), // input file
+        "dnxhd", // video codec
+        "scale=1920x1080,fps=60,format=yuv422p", // video format
+        "dnxhr_hq", // video profile
+        "pcm_s16le", // audio codec
+        outputPath // output file path
+      );
+
+      ProcessBuilder pb = new ProcessBuilder(cmd.split("\\s+"));
+      pb.redirectErrorStream(true);
+      pb.redirectOutput(ProcessBuilder.Redirect.PIPE);
+      try {
+        Process process = pb.start();
+        int ret = process.waitFor();
+        System.out.printf("Program exited with code: %d", ret);
+      } catch (IOException | InterruptedException e) {
+        throw new RuntimeException(e);
+      }
+    }
+
+    // end output
+    System.out.println("------------ End of transcoding ------------");
+    System.out.println();
+  }
+
+  // ensures the transcoder's working directory is available
+  private void initDirectory() {
+    // create transcoder directory
+    IOUtils.createDirectory(this.repo_dir);
+    // create the sub-directories
+    IOUtils.createDirectory(Paths.get(this.repo_dir, "ingest").toString());
+    IOUtils.createDirectory(Paths.get(this.repo_dir, "archive").toString());
+    IOUtils.createDirectory(Paths.get(this.repo_dir, "output").toString());
+  }
+
+
+  // Stream handler class for the Transcoder
+  private static class StreamGobbler implements Runnable {
+    private InputStream inputStream;
+    private Consumer<String> consumer;
+
+    public StreamGobbler(InputStream inputStream, Consumer<String> consumer) {
+        this.inputStream = inputStream;
+        this.consumer = consumer;
+    }
+
+    @Override
+    public void run() {
+      new BufferedReader(new InputStreamReader(inputStream)).lines().forEach(consumer);
+    }
+  }
+
+}

src/test/java/tech/bitgoblin/AppTest.java

@@ -0,0 +1,20 @@
+package tech.bitgoblin;
+
+import static org.junit.Assert.assertTrue;
+
+import org.junit.Test;
+
+/**
+ * Unit test for simple App.
+ */
+public class AppTest 
+{
+    /**
+     * Rigorous Test :-)
+     */
+    @Test
+    public void shouldAnswerWithTrue()
+    {
+        assertTrue( true );
+    }
+}