Adds a video downscaler

src/main/java/net/knarcraft/ffmpegconverter/Main.java

@@ -3,6 +3,7 @@ package net.knarcraft.ffmpegconverter;
 import net.knarcraft.ffmpegconverter.converter.AnimeConverter;
 import net.knarcraft.ffmpegconverter.converter.AudioConverter;
 import net.knarcraft.ffmpegconverter.converter.Converter;
+import net.knarcraft.ffmpegconverter.converter.DownScaleConverter;
 import net.knarcraft.ffmpegconverter.converter.MKVToMP4Transcoder;
 import net.knarcraft.ffmpegconverter.converter.MkvH264Converter;
 import net.knarcraft.ffmpegconverter.converter.MkvH265ReducedConverter;
@@ -65,7 +66,7 @@ class Main {
     private static Converter loadConverter() throws IOException {
         int choice = getChoice("Which converter do you want do use?\n1. Anime to web mp4\n2. Audio converter\n" +
                 "3. Video converter\n4. Web video converter\n5. MKV to h264 converter\n6. MKV to h265 reduced " +
-                "converter\n7. MKV to MP4 transcoder", 1, 7);
+                "converter\n7. MKV to MP4 transcoder\n8. DownScaleConverter", 1, 8);
 
         switch (choice) {
             case 1:
@@ -82,6 +83,8 @@ class Main {
                 return new MkvH265ReducedConverter(FFPROBE_PATH, FFMPEG_PATH);
             case 7:
                 return generateMKVToMP4Transcoder();
+            case 8:
+                return generateDownScaleConverter();
         }
         return null;
     }
@@ -117,6 +120,28 @@ class Main {
         }
     }
 
+    /**
+     * Initializes and returns the downscale converter
+     *
+     * @return <p>The initialized downscale converter</p>
+     * @throws IOException <p>If unable to print to output</p>
+     */
+    private static Converter generateDownScaleConverter() throws IOException {
+        OutputUtil.println("(New width e.x. 1920) (New height e.x. 1080)\nYour input: ");
+        List<String> input = readInput(3);
+        int newWidth;
+        int newHeight;
+
+        try {
+            newWidth = Integer.parseInt(input.get(0));
+            newHeight = Integer.parseInt(input.get(1));
+            return new DownScaleConverter(FFPROBE_PATH, FFMPEG_PATH, newWidth, newHeight);
+        } catch (NumberFormatException exception) {
+            OutputUtil.println("Width or height is not a number");
+            return null;
+        }
+    }
+
     /**
      * Initializes and returns the MKV to MP4 transcoder
      *

src/main/java/net/knarcraft/ffmpegconverter/converter/AbstractConverter.java

@@ -30,7 +30,7 @@ public abstract class AbstractConverter implements Converter {
     /**
      * Initializes variables used by the abstract converter
      */
-    AbstractConverter(String newExtension) {
+    AbstractConverter(@Nullable String newExtension) {
         this.newExtension = newExtension;
         OutputUtil.setDebug(this.debug);
         try {
@@ -128,11 +128,19 @@ public abstract class AbstractConverter implements Converter {
             throw new IllegalArgumentException("The file has no valid streams. Please make sure the file exists and" +
                     " is not corrupt.");
         }
-        String newPath = FileUtil.getNonCollidingPath(folder, file, newExtension);
+        String outExtension = newExtension != null ? newExtension : FileUtil.getExtension(file.getName());
+        String newPath = FileUtil.getNonCollidingPath(folder, file, outExtension);
         OutputUtil.println();
         OutputUtil.println("Preparing to start process...");
         OutputUtil.println("Converting " + file);
-        ProcessBuilder processBuilder = new ProcessBuilder(generateConversionCommand(ffmpegPath, file, streams, newPath));
+
+        String[] command = generateConversionCommand(ffmpegPath, file, streams, newPath);
+        // If no commands were given, no conversion is necessary
+        if (command.length == 0) {
+            return;
+        }
+
+        ProcessBuilder processBuilder = new ProcessBuilder(command);
         FFMpegHelper.runProcess(processBuilder, folder, "\n", true);
     }
 

src/main/java/net/knarcraft/ffmpegconverter/converter/DownScaleConverter.java

@@ -0,0 +1,69 @@
+package net.knarcraft.ffmpegconverter.converter;
+
+import net.knarcraft.ffmpegconverter.streams.StreamObject;
+import net.knarcraft.ffmpegconverter.streams.VideoStream;
+import net.knarcraft.ffmpegconverter.utility.FFMpegHelper;
+
+import java.io.File;
+import java.util.List;
+
+/**
+ * A converter for converting video files
+ */
+public class DownScaleConverter extends AbstractConverter {
+
+    private final int newWidth;
+    private final int newHeight;
+
+    /**
+     * Instantiates a new video converter
+     *
+     * @param ffprobePath <p>Path/command to ffprobe.</p>
+     * @param ffmpegPath  <p>Path/command to ffmpeg.</p>
+     * @param newWidth    <p>The new width of the video</p>
+     * @param newHeight   <p>The new height of the video</p>
+     */
+    public DownScaleConverter(String ffprobePath, String ffmpegPath, int newWidth, int newHeight) {
+        super(null);
+        this.ffprobePath = ffprobePath;
+        this.ffmpegPath = ffmpegPath;
+        this.newHeight = newHeight;
+        this.newWidth = newWidth;
+    }
+
+    @Override
+    public String[] generateConversionCommand(String executable, File file, List<StreamObject> streams, String outFile) {
+        VideoStream videoStream = getNthVideoStream(streams, 0);
+        if (videoStream == null || (videoStream.getWidth() <= newWidth && videoStream.getHeight() <= newHeight)) {
+            return new String[0];
+        }
+
+        List<String> command = FFMpegHelper.getFFMpegGeneralFileCommand(executable, file.getName());
+        if (this.debug) {
+            FFMpegHelper.addDebugArguments(command, 50, 120);
+        }
+
+        //Add all streams without re-encoding
+        command.add("-map");
+        command.add("0");
+        command.add("-c:a");
+        command.add("copy");
+        command.add("-c:s");
+        command.add("copy");
+        command.add("-vf");
+        command.add("scale=" + newWidth + ":" + newHeight);
+        command.add("-crf");
+        command.add("20");
+        command.add("-preset");
+        command.add("slow");
+
+        command.add(outFile);
+        return command.toArray(new String[0]);
+    }
+
+    @Override
+    public String[] getValidFormats() {
+        return videoFormats;
+    }
+
+}

src/main/java/net/knarcraft/ffmpegconverter/utility/FileUtil.java

@@ -25,17 +25,7 @@ public final class FileUtil {
      */
     public static String getNonCollidingPath(File folder, File file, String outExtension) {
         return FileUtil.getNonCollidingFilename(folder.getAbsolutePath() + File.separator +
-                FileUtil.stripExtension(file) + "." + outExtension, outExtension);
-    }
-
-    /**
-     * Removes the extension from a file name
-     *
-     * @param file <p>A filename.</p>
-     * @return <p>A filename without its extension.</p>
-     */
-    static String stripExtension(String file) {
-        return file.substring(0, file.lastIndexOf('.'));
+                FileUtil.stripExtension(file.getName()) + "." + outExtension, outExtension);
     }
 
     /**
@@ -117,7 +107,7 @@ public final class FileUtil {
      */
     private static String getNonCollidingFilename(String targetPath, String extension) {
         File newFile = new File(targetPath);
-        String fileName = stripExtension(targetPath);
+        String fileName = stripExtension(targetPath).replaceAll("\\([0-9]+\\)$", "");
         int i = 1;
         while (newFile.exists()) {
             newFile = new File(fileName + "(" + i++ + ")" + "." + extension);
@@ -126,13 +116,27 @@ public final class FileUtil {
     }
 
     /**
-     * Gets filename without extension from File object
+     * Gets the extension of the given filename
      *
-     * @param file <p>A file object.</p>
-     * @return <p>A filename.</p>
+     * @param file <p>The filename to check</p>
+     * @return <p>The file's extension</p>
      */
-    private static String stripExtension(File file) {
-        return file.getName().substring(0, file.getName().lastIndexOf('.'));
+    public static String getExtension(String file) {
+        if (file.contains(".")) {
+            return file.substring(file.lastIndexOf('.') + 1);
+        } else {
+            return "";
+        }
+    }
+
+    /**
+     * Removes the extension from a file name
+     *
+     * @param file <p>A filename.</p>
+     * @return <p>A filename without its extension.</p>
+     */
+    public static String stripExtension(String file) {
+        return file.substring(0, file.lastIndexOf('.'));
     }
 
 }