optimize cmd: screen shot

optimize cmd: screen shot

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

@@ -152,9 +152,8 @@ public class VideoHandleActivity extends BaseActivity {
                 break;
             case R.id.btn_screen_shot://视频截图
                 String screenShot = PATH + File.separator + "screenShot.jpg";
-                String size = "1080x720";
                 int time = 18;
-                commandLine = FFmpegUtil.screenShot(srcFile, time, size, screenShot);
+                commandLine = FFmpegUtil.screenShot(srcFile, time, screenShot);
                 break;
             case R.id.btn_water_mark://视频添加水印
                 //1、图片

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

@@ -166,13 +166,12 @@ public class FFmpegUtil {
      *
      * @param srcFile    源文件
      * @param time       截图开始时间
-     * @param size       图片尺寸大小
      * @param targetFile 目标文件
      * @return 截图后的文件
      */
-    public static String[] screenShot(String srcFile, int time, String size, String targetFile) {
-        String screenShotCmd = "ffmpeg -i %s -f image2 -ss %d -s %s %s";
-        screenShotCmd = String.format(Locale.getDefault(), screenShotCmd, srcFile, time, size, targetFile);
+    public static String[] screenShot(String srcFile, int time, String targetFile) {
+        String screenShotCmd = "ffmpeg -i %s -f image2 -ss %d -vframes 1 -an %s";
+        screenShotCmd = String.format(Locale.getDefault(), screenShotCmd, srcFile, time, targetFile);
         return screenShotCmd.split(" ");
     }