i meet some exception

[woniu0936]

java.lang.IllegalStateException
at android.media.MediaCodec.native_dequeueOutputBuffer(Native Method)
at android.media.MediaCodec.dequeueOutputBuffer(MediaCodec.java:1036)
at com.gouhuoapp.camerarecord.video.AndroidEncoder$override.drainEncoder(AndroidEncoder.java:86)
at com.gouhuoapp.camerarecord.video.AndroidEncoder$override.access$dispatch(AndroidEncoder.java)
at com.gouhuoapp.camerarecord.video.AndroidEncoder.drainEncoder(AndroidEncoder.java:0)
at com.gouhuoapp.camerarecord.video.CameraEncoder.handleFrameAvailable(CameraEncoder.java:497)
at com.gouhuoapp.camerarecord.video.CameraEncoder.access$100(CameraEncoder.java:28)
at com.gouhuoapp.camerarecord.video.CameraEncoder$EncoderHandler.handleMessage(CameraEncoder.java:913)
at android.os.Handler.dispatchMessage(Handler.java:102)
at android.os.Looper.loop(Looper.java:135)
at com.gouhuoapp.camerarecord.video.CameraEncoder.run(CameraEncoder.java:676)
at java.lang.Thread.run(Thread.java:818)

[woniu0936]

in MediaCodec，i find below：
/**
* Dequeue an output buffer, block at most "timeoutUs" microseconds.
* Returns the index of an output buffer that has been successfully
* decoded or one of the INFO_* constants.
* @param info Will be filled with buffer meta data.
* @param timeoutUs The timeout in microseconds, a negative timeout indicates "infinite".
* @throws IllegalStateException if not in the Executing state,
* or codec is configured in asynchronous mode.
* @throws MediaCodec.CodecException upon codec error.
/
@OutputBufferInfo
public final int dequeueOutputBuffer(
@nonnull BufferInfo info, long timeoutUs) {
int res = native_dequeueOutputBuffer(info, timeoutUs);
synchronized(mBufferLock) {
if (res == INFO_OUTPUT_BUFFERS_CHANGED) {
cacheBuffers(false / input */);
} else if (res >= 0) {
validateOutputByteBuffer(mCachedOutputBuffers, res, info);
if (mHasSurface) {
mDequeuedOutputInfos.put(res, info.dup());
}
}
}
return res;
}

[woniu0936]

IllegalStateException if codec is configured in asynchronous mode？？in VideoEncoderCore you say “This class is not thread-safe, with one exception: it is valid to use the input surface on one thread, and drain the output on a different thread.”

[woniu0936]

It's really nice if you can help check it.