Adds a MKV to h264 MKV converter

src/main/java/net/knarcraft/ffmpegconverter/converter/MkvH264Converter.java

@@ -0,0 +1,75 @@
+package net.knarcraft.ffmpegconverter.converter;
+
+import net.knarcraft.ffmpegconverter.streams.AudioStream;
+import net.knarcraft.ffmpegconverter.streams.StreamObject;
+import net.knarcraft.ffmpegconverter.streams.SubtitleStream;
+import net.knarcraft.ffmpegconverter.streams.VideoStream;
+import net.knarcraft.ffmpegconverter.utility.FFMpegHelper;
+
+import java.io.File;
+import java.util.List;
+
+/**
+ * A converter solely for the purpose of converting video streams of MKV files into h264
+ */
+public class MkvH264Converter extends AbstractConverter {
+
+    /**
+     * Initializes variables used by the abstract converter
+     *
+     * @param ffprobePath <p>Path/command to ffprobe.</p>
+     * @param ffmpegPath  <p>Path/command to ffmpeg.</p>
+     */
+    public MkvH264Converter(String ffprobePath, String ffmpegPath) {
+        super("mkv");
+        this.ffprobePath = ffprobePath;
+        this.ffmpegPath = ffmpegPath;
+    }
+
+    @Override
+    public String[] getValidFormats() {
+        return new String[]{"mkv"};
+    }
+
+    @Override
+    public String[] generateConversionCommand(String executable, File file, List<StreamObject> streams,
+                                              String outFile) {
+        List<String> command = FFMpegHelper.getFFMpegGeneralFileCommand(executable, file.getName());
+        if (this.debug) {
+            FFMpegHelper.addDebugArguments(command, 50, 120);
+        }
+
+        // Map video if present
+        if (!filterStreamsByType(streams, VideoStream.class).isEmpty()) {
+            command.add("-map");
+            command.add("0:v");
+            command.add("-vcodec");
+            command.add("h264");
+        }
+
+        // Map audio if present
+        if (!filterStreamsByType(streams, AudioStream.class).isEmpty()) {
+            command.add("-map");
+            command.add("0:a");
+            command.add("-c:a");
+            command.add("copy");
+        }
+
+        // Map subtitles if present
+        if (!filterStreamsByType(streams, SubtitleStream.class).isEmpty()) {
+            command.add("-map");
+            command.add("0:s");
+            command.add("-c:s");
+            command.add("copy");
+        }
+
+        command.add("-map_metadata");
+        command.add("0");
+        command.add("-movflags");
+        command.add("use_metadata_tags");
+
+        command.add(outFile);
+        return command.toArray(new String[0]);
+    }
+
+}