Video Audio muxing issue (java.lang.IllegalStateException: Failed to stop the muxer)

Question

I'm making an app to record video without using the default video recorder. To make the video I'm using the MediaMuxer. The audio and video recording is done on separate threads.

The app randomly crashes when I stop recording, and the log shows

MPEG4Writer(23890): There are no sync frames for video track

java.lang.IllegalStateException: Failed to stop the muxer

12-24 15:26:36.736: E/AndroidRuntime(23890): FATAL EXCEPTION: TextureMovieEncoder
12-24 15:26:36.736: E/AndroidRuntime(23890): Process: com.example.cameradummy, PID: 23890
12-24 15:26:36.736: E/AndroidRuntime(23890): java.lang.IllegalStateException: Failed to stop the muxer
12-24 15:26:36.736: E/AndroidRuntime(23890):    at android.media.MediaMuxer.nativeStop(Native Method)
12-24 15:26:36.736: E/AndroidRuntime(23890):    at android.media.MediaMuxer.stop(MediaMuxer.java:226)
12-24 15:26:36.736: E/AndroidRuntime(23890):    at com.example.cameradummy.VideoEncoderCore.closeMuxer(VideoEncoderCore.java:421)

When I tried recording the video without adding the audio track it worked fine, but when both audio and video tracks are added to the muxer it gives this issue.

I am referring grafika cameracaptureactivity for video recording

I am not able to figure out if the issue is caused due to the threading or some sync problem. Could someone please help me resolve this issue.