diff --git a/entity/ffmpeg.py b/entity/ffmpeg.py
index d765b70..1d6bb51 100644
--- a/entity/ffmpeg.py
+++ b/entity/ffmpeg.py
@@ -323,8 +323,13 @@ class FfmpegTask(object):
                 else:
                     output_args.append(audio_output_str)
             output_args += AUDIO_ARGS
+            if self.annexb:
+                output_args.append("-bsf:v")
+                output_args.append("h264_mp4toannexb")
+                output_args.append("-bsf:a")
+                output_args.append("setts=pts=DTS")
             output_args.append("-f")
-            output_args.append("mp4")
+            output_args.append("mpegts" if self.annexb else "mp4")
             _filter_args = [] if len(filter_args) == 0 else ["-filter_complex", ";".join(filter_args)]
             return args + input_args + _filter_args + output_args + [self.get_output_file()]
         elif self.task_type == 'copy':