Adds a converter to embed subtitles

pom.xml

@@ -71,6 +71,20 @@
                     <target>${java.version}</target>
                 </configuration>
             </plugin>
+            <plugin>
+                <groupId>org.apache.maven.plugins</groupId>
+                <artifactId>maven-jar-plugin</artifactId>
+                <version>3.1.0</version>
+                <configuration>
+                    <archive>
+                        <manifest>
+                            <addClasspath>true</addClasspath>
+                            <classpathPrefix>lib/</classpathPrefix>
+                            <mainClass>net.knarcraft.ffmpegconverter.Main</mainClass>
+                        </manifest>
+                    </archive>
+                </configuration>
+            </plugin>
         </plugins>
     </build>
 

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

@@ -7,6 +7,7 @@ import net.knarcraft.ffmpegconverter.converter.DownScaleConverter;
 import net.knarcraft.ffmpegconverter.converter.MKVToMP4Transcoder;
 import net.knarcraft.ffmpegconverter.converter.MkvH264Converter;
 import net.knarcraft.ffmpegconverter.converter.MkvH265ReducedConverter;
+import net.knarcraft.ffmpegconverter.converter.SubtitleEmbed;
 import net.knarcraft.ffmpegconverter.converter.VideoConverter;
 import net.knarcraft.ffmpegconverter.converter.WebVideoConverter;
 import net.knarcraft.ffmpegconverter.utility.FileUtil;
@@ -66,7 +67,7 @@ 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\n8. DownScaleConverter", 1, 8);
+                "converter\n7. MKV to MP4 transcoder\n8. DownScaleConverter\n9. mp4 Subtitle Embed", 1, 9);
 
         switch (choice) {
             case 1:
@@ -85,6 +86,8 @@ class Main {
                 return generateMKVToMP4Transcoder();
             case 8:
                 return generateDownScaleConverter();
+            case 9:
+                return new SubtitleEmbed(FFPROBE_PATH, FFMPEG_PATH);
         }
         return null;
     }

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

@@ -0,0 +1,76 @@
+package net.knarcraft.ffmpegconverter.converter;
+
+import net.knarcraft.ffmpegconverter.streams.StreamObject;
+import net.knarcraft.ffmpegconverter.streams.SubtitleStream;
+import net.knarcraft.ffmpegconverter.utility.FFMpegHelper;
+
+import java.io.File;
+import java.util.ArrayList;
+import java.util.List;
+
+/**
+ * A converter to embed adjacent subtitles into mp4 files
+ */
+public class SubtitleEmbed 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 SubtitleEmbed(String ffprobePath, String ffmpegPath) {
+        super(null);
+        this.ffprobePath = ffprobePath;
+        this.ffmpegPath = ffmpegPath;
+    }
+
+    @Override
+    public String[] getValidFormats() {
+        return new String[]{"mp4"};
+    }
+
+    @Override
+    public String[] generateConversionCommand(String executable, File file, List<StreamObject> streams, String outFile) {
+        List<String> command = FFMpegHelper.getFFMpegGeneralFileCommand(executable, file.getName());
+
+        List<SubtitleStream> subtitleStreams = filterStreamsByType(streams, SubtitleStream.class);
+        List<SubtitleStream> externalSubtitles = new ArrayList<>();
+        for (SubtitleStream subtitleStream : subtitleStreams) {
+            if (!subtitleStream.isInternalSubtitle()) {
+                externalSubtitles.add(subtitleStream);
+            }
+        }
+
+        if (externalSubtitles.isEmpty()) {
+            System.err.println("No external subtitles found for " + file.getName());
+        }
+
+        for (SubtitleStream subtitleStream : externalSubtitles) {
+            command.add("-i");
+            command.add(subtitleStream.getFile());
+        }
+
+        command.add("-c");
+        command.add("copy");
+        command.add("-c:s");
+        command.add("mov_text");
+
+        int i = 0;
+        for (SubtitleStream subtitleStream : subtitleStreams) {
+            if (subtitleStream.getLanguage() != null) {
+                command.add("-metadata:s:s:" + i);
+                command.add("language=" + subtitleStream.getLanguage());
+            }
+            i++;
+        }
+
+        if (this.debug) {
+            FFMpegHelper.addDebugArguments(command, 50, 120);
+        }
+
+        command.add(outFile);
+        return command.toArray(new String[0]);
+    }
+
+}

src/main/java/net/knarcraft/ffmpegconverter/streams/SubtitleStream.java

@@ -1,5 +1,9 @@
 package net.knarcraft.ffmpegconverter.streams;
 
+import net.knarcraft.ffmpegconverter.utility.FileUtil;
+import org.jetbrains.annotations.NotNull;
+import org.jetbrains.annotations.Nullable;
+
 /**
  * An object representation of a subtitle stream in a media file
  */
@@ -22,8 +26,8 @@ public class SubtitleStream extends AbstractStream implements StreamObject {
      * @param file             <p>The file containing the subtitle.</p>
      * @param isInternalStream <p>Whether this subtitle stream is in the video file itself</p>
      */
-    public SubtitleStream(String codecName, int absoluteIndex, int relativeIndex, String language, String title,
-                          String file, boolean isInternalStream) {
+    public SubtitleStream(@Nullable String codecName, int absoluteIndex, int relativeIndex, @Nullable String language,
+                          @Nullable String title, @NotNull String file, boolean isInternalStream) {
         this.codecName = codecName;
         this.absoluteIndex = absoluteIndex;
         this.language = language;
@@ -33,6 +37,13 @@ public class SubtitleStream extends AbstractStream implements StreamObject {
         this.isImageSubtitle = isImageSubtitle();
         this.isInternalStream = isInternalStream;
         this.file = file;
+
+        if (this.language == null || this.language.isEmpty()) {
+            String possibleLanguage = FileUtil.getLanguage(file);
+            if (possibleLanguage != null) {
+                this.language = possibleLanguage;
+            }
+        }
     }
 
     /**

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

@@ -19,6 +19,7 @@ import java.util.List;
 public final class FFMpegHelper {
 
     private static final String PROBE_SPLIT_CHARACTER = "øæåÆØå";
+    private static String[] subtitleFormats = null;
 
     private FFMpegHelper() {
 
@@ -305,7 +306,9 @@ public final class FFMpegHelper {
             throws IOException {
         List<StreamObject> parsedStreams = new ArrayList<>();
         //Find all files in the same directory with external subtitle formats
-        String[] subtitleFormats = FileUtil.readFileLines("subtitle_formats.txt");
+        if (subtitleFormats == null) {
+            subtitleFormats = FileUtil.readFileLines("subtitle_formats.txt");
+        }
         File[] subtitleFiles = FileUtil.listFilesRecursive(directory, subtitleFormats, 1);
 
         //Return early if no files were found
@@ -315,9 +318,11 @@ public final class FFMpegHelper {
 
         String fileTitle = FileUtil.stripExtension(convertingFile);
         List<File> subtitleFilesList = new ArrayList<>(Arrays.asList(subtitleFiles));
+
         //Finds the files which are subtitles probably belonging to the file
         subtitleFilesList = ListUtil.getMatching(subtitleFilesList,
                 (subtitleFile) -> subtitleFile.getName().contains(fileTitle));
+
         for (File subtitleFile : subtitleFilesList) {
             //Probe the files and add them to the result list
             String[] streams = probeForStreams(ffprobePath, subtitleFile);

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

@@ -1,5 +1,8 @@
 package net.knarcraft.ffmpegconverter.utility;
 
+import org.jetbrains.annotations.NotNull;
+import org.jetbrains.annotations.Nullable;
+
 import java.io.BufferedReader;
 import java.io.File;
 import java.io.IOException;
@@ -139,4 +142,43 @@ public final class FileUtil {
         return file.substring(0, file.lastIndexOf('.'));
     }
 
+    /**
+     * Gets the locale specifying the language of the given file name
+     *
+     * @param fileName <p>The file name to check</p>
+     * @return <p>The locale, or null if no locale could be parsed</p>
+     */
+    public static @Nullable String getLanguage(@NotNull String fileName) {
+        fileName = stripExtension(fileName);
+
+        String possibleLanguage = getExtension(fileName);
+        // NRK Nett-TV has a tendency to use nb-ttv for Norwegian for some reason 
+        possibleLanguage = possibleLanguage.replace("nb-ttv", "nb-nor");
+
+        // TODO: Some languages are specified by using "-en" or "-English" or ".en" or ".English" at the end of file names
+        if (possibleLanguage.length() <= 1 || (possibleLanguage.length() >= 4 &&
+                (!possibleLanguage.contains("-") || possibleLanguage.length() >= 8))) {
+            return null;
+        }
+
+        // Hope the text is an actual valid language
+        if (!possibleLanguage.contains("-")) {
+            return possibleLanguage;
+        }
+
+        // Make sure the "-" has at least two characters on each side
+        String[] parts = possibleLanguage.split("-");
+        if (parts[0].length() < 2 || parts[1].length() < 2) {
+            return null;
+        }
+
+        if (parts[1].length() == 3) {
+            // Return three-letter country code
+            return parts[1].toLowerCase();
+        } else {
+            // Return en-US country code
+            return parts[0].substring(0, 2).toLowerCase() + "-" + parts[1].substring(0, 2).toUpperCase();
+        }
+    }
+
 }

src/main/resources/subtitle_formats.txt

@@ -1,5 +1,6 @@
-4
+5
 idx
 sub
 srt
 ass
+vtt