Properly fixes conversion of files with filenames containing square brackets

Unknown whether this breaks conversion of filenames containing semicolons or apostrophes

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

@@ -50,7 +50,8 @@ public class AnimeConverter extends Converter {
         if (streams.isEmpty()) {
             throw new IllegalArgumentException("The file has no valid streams. Please make sure the file exists and is not corrupt.");
         }
-        String newPath = fileCollisionPrevention(folder.getAbsolutePath() + File.separator + stripExtension(file) + ".mp4", "mp4");
+        String newPath = fileCollisionPrevention(folder.getAbsolutePath() + File.separator +
+                stripExtension(file) + ".mp4", "mp4");
         printl("Preparing to start process...");
         String[] command = builderCommand(ffmpegPath, file.getName(), streams, newPath);
         ProcessBuilder processBuilder = new ProcessBuilder(command);
@@ -108,17 +109,20 @@ public class AnimeConverter extends Converter {
 
         if (subtitleStream != null && subtitleStream.getIsImageSubtitle()) {
             command.add("-filter_complex");
-            command.add("[0:v:" + videoStream.getAbsoluteIndex() + "][0:" + subtitleStream.getAbsoluteIndex() + "]overlay");
+            String filter = String.format("[0:v:%d][0:%d]overlay", videoStream.getAbsoluteIndex(),
+                    subtitleStream.getAbsoluteIndex());
+            command.add(filter);
         } else if (subtitleStream != null) {
             command.add("-map");
-            command.add("0:" + videoStream.getAbsoluteIndex());
+            command.add(String.format("0:%d", videoStream.getAbsoluteIndex()));
             command.add("-vf");
             String safeFileName = escapeSpecialCharactersInFileName(fileName);
-            String subtitleCommand = String.format("subtitles=\"%s\"", safeFileName);
+            String subtitleCommand = String.format("subtitles='%s':si=%d", safeFileName, 
+                    subtitleStream.getRelativeIndex());
             command.add(subtitleCommand);
         } else {
             command.add("-map");
-            command.add("0:" + videoStream.getAbsoluteIndex());
+            command.add(String.format("0:%d", videoStream.getAbsoluteIndex()));
         }
 
         command.add(outFile);

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

@@ -427,9 +427,9 @@ public abstract class Converter {
     static String escapeSpecialCharactersInFileName(String fileName) {
         return fileName.replace("'", "\\\\\\'")
                 .replace(",", "\\\\\\,")
-                .replace(";", "\\\\\\;");
-                /*.replace("]", "\\]") //Not sure whether these should be escaped or not
-                .replace("[", "\\[");*/
+                .replace(";", "\\\\\\;")
+                .replace("]", "\\]")
+                .replace("[", "\\[");
     }
     
     static void print(String input) throws IOException {