add subtitle into video

app/src/main/java/com/frank/ffmpeg/activity/VideoHandleActivity.kt

@@ -117,7 +117,8 @@ class VideoHandleActivity : BaseActivity() {
                 R.id.btn_moov,
                 R.id.btn_speed,
                 R.id.btn_flv,
-                R.id.btn_thumbnail
+                R.id.btn_thumbnail,
+                R.id.btn_add_subtitle
         )
     }
 
@@ -148,6 +149,10 @@ class VideoHandleActivity : BaseActivity() {
             showToast(getString(R.string.wrong_video_format))
             return
         }
+        val suffix = FileUtil.getFileSuffix(srcFile)
+        if (suffix == null || suffix.isEmpty()) {
+            return
+        }
         when (viewId) {
             R.id.btn_video_transform//transform format
             -> {
@@ -156,10 +161,6 @@ class VideoHandleActivity : BaseActivity() {
             }
             R.id.btn_video_cut//cut video
             -> {
-                val suffix = FileUtil.getFileSuffix(srcFile)
-                if (suffix == null || suffix.isEmpty()) {
-                    return
-                }
                 val cutVideo = PATH + File.separator + "cutVideo" + suffix
                 val startTime = 0
                 val duration = 20
@@ -321,14 +322,17 @@ class VideoHandleActivity : BaseActivity() {
             }
             R.id.btn_thumbnail// insert thumbnail into video
             -> {
-                val thumbSuffix = FileUtil.getFileSuffix(srcFile)
-                if (thumbSuffix == null || thumbSuffix.isEmpty()) {
-                    return
-                }
                 val thumbnailPath = PATH + File.separator + "thumb.jpg"
-                val thumbVideoPath = PATH + File.separator + "thumbnailVideo" + thumbSuffix
+                val thumbVideoPath = PATH + File.separator + "thumbnailVideo" + suffix
                 commandLine = FFmpegUtil.insertPicIntoVideo(srcFile, thumbnailPath, thumbVideoPath)
             }
+            R.id.btn_add_subtitle//add subtitle into video
+            -> {
+                Log.e(TAG, "add subtitle...")
+                val subtitlePath = PATH + File.separator + "test.ass"
+                val addSubtitlePath = PATH + File.separator + "subtitle" + suffix
+                commandLine = FFmpegUtil.addSubtitleIntoVideo(srcFile, subtitlePath, addSubtitlePath)
+            }
             else -> {
             }
         }

app/src/main/java/com/frank/ffmpeg/util/FFmpegUtil.java

@@ -95,14 +95,14 @@ public class FFmpegUtil {
      * @return mux success or not
      */
     public static String[] mediaMux(String videoFile, String audioFile, boolean copy, String muxFile) {
-        String mixAudioCmd;
+        String mediaMuxCmd;
         if (copy) {
-            mixAudioCmd = "ffmpeg -i %s -i %s -codec copy -y %s";
+            mediaMuxCmd = "ffmpeg -i %s -i %s -codec copy -y %s";
         } else {
-            mixAudioCmd = "ffmpeg -i %s -i %s -y %s";
+            mediaMuxCmd = "ffmpeg -i %s -i %s -y %s";
         }
-        mixAudioCmd = String.format(Locale.getDefault(), mixAudioCmd, videoFile, audioFile, muxFile);
-        return mixAudioCmd.split(" ");
+        mediaMuxCmd = String.format(Locale.getDefault(), mediaMuxCmd, videoFile, audioFile, muxFile);
+        return mediaMuxCmd.split(" ");
     }
 
     /**
@@ -114,9 +114,9 @@ public class FFmpegUtil {
      */
     public static String[] extractAudio(String inputPath, String outputPath) {
         //-vn: disable video
-        String mixAudioCmd = "ffmpeg -i %s -acodec copy -vn %s";
-        mixAudioCmd = String.format(mixAudioCmd, inputPath, outputPath);
-        return mixAudioCmd.split(" ");
+        String extractAudioCmd = "ffmpeg -i %s -acodec copy -vn %s";
+        extractAudioCmd = String.format(extractAudioCmd, inputPath, outputPath);
+        return extractAudioCmd.split(" ");
     }
 
     /**
@@ -128,9 +128,9 @@ public class FFmpegUtil {
      */
     public static String[] extractVideo(String inputPath, String outputPath) {
         //-an: disable audio
-        String mixAudioCmd = "ffmpeg -i %s -vcodec copy -an %s";
-        mixAudioCmd = String.format(mixAudioCmd, inputPath, outputPath);
-        return mixAudioCmd.split(" ");
+        String extractVideoCmd = "ffmpeg -i %s -vcodec copy -an %s";
+        extractVideoCmd = String.format(extractVideoCmd, inputPath, outputPath);
+        return extractVideoCmd.split(" ");
     }
 
     /**
@@ -360,9 +360,9 @@ public class FFmpegUtil {
      * @return encode audio success or not
      */
     public static String[] encodeAudio(String inputPath, String outputPath, int sampleRate, int channel) {
-        String combineVideo = "ffmpeg -f s16le -ar %d -ac %d -i %s %s";
-        combineVideo = String.format(Locale.getDefault(), combineVideo, sampleRate, channel, inputPath, outputPath);
-        return combineVideo.split(" ");
+        String encodeAudioCmd = "ffmpeg -f s16le -ar %d -ac %d -i %s %s";
+        encodeAudioCmd = String.format(Locale.getDefault(), encodeAudioCmd, sampleRate, channel, inputPath, outputPath);
+        return encodeAudioCmd.split(" ");
     }
 
     /**
@@ -551,9 +551,15 @@ public class FFmpegUtil {
      * @return command of inserting picture
      */
     public static String[] insertPicIntoVideo(String inputPath, String picturePath, String outputPath) {
-        String buildIndex = "ffmpeg -i %s -i %s -map 0 -map 1 -c copy -c:v:1 png -disposition:v:1 attached_pic %s";
-        buildIndex = String.format(buildIndex, inputPath, picturePath, outputPath);
-        return buildIndex.split(" ");
+        String insertPicCmd = "ffmpeg -i %s -i %s -map 0 -map 1 -c copy -c:v:1 png -disposition:v:1 attached_pic %s";
+        insertPicCmd = String.format(insertPicCmd, inputPath, picturePath, outputPath);
+        return insertPicCmd.split(" ");
+    }
+
+    public static String[] addSubtitleIntoVideo(String inputPath, String subtitlePath, String outputPath) {
+        String subtitleCmd = "ffmpeg -i %s -vf subtitles=%s %s";
+        subtitleCmd = String.format(subtitleCmd, inputPath, subtitlePath, outputPath);
+        return subtitleCmd.split(" ");
     }
 
     /**

app/src/main/res/layout/activity_video_handle.xml

@@ -85,6 +85,13 @@
                 android:layout_marginTop="4dp"
                 android:text="@string/video_multi"/>
 
+            <Button
+                android:id="@+id/btn_add_subtitle"
+                android:layout_width="wrap_content"
+                android:layout_height="wrap_content"
+                android:layout_marginTop="4dp"
+                android:text="@string/video_subtitle"/>
+
             <Button
                 android:id="@+id/btn_reverse_video"
                 android:layout_width="wrap_content"

app/src/main/res/values-en/strings.xml

@@ -53,6 +53,7 @@
     <string name="video_speed">Playing speed</string>
     <string name="video_flv">FLV index</string>
     <string name="video_thumbnail">Insert thumbnail</string>
+    <string name="video_subtitle">add subtitle</string>
 
     <string name="swap">Swap</string>
     <string name="start">Start</string>

app/src/main/res/values/strings.xml

@@ -53,6 +53,7 @@
     <string name="video_speed">播放倍率</string>
     <string name="video_flv">FLV索引</string>
     <string name="video_thumbnail">插入封面</string>
+    <string name="video_subtitle">添加字幕</string>
 
     <string name="swap">切换</string>
     <string name="start">开始</string>