mediaCodec.dequeueOutputBuffer(bufferInfo, 0)为什么一直返回-1

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ByteBuffer[] inputBuffers;
Socket socket = serverSocket.accept();
MediaCodec.BufferInfo bufferInfo = new MediaCodec.BufferInfo();
Log.i(TAG, "run: 连接成功");
InputStream inputStream = socket.getInputStream();
inputBuffers = mediaCodec.getInputBuffers();
int i = 0;
while (true) {
byte[] byteBuffer=new byte[10240];
inputStream.read(byteBuffer);
int inputBufferIndex = mediaCodec.dequeueInputBuffer(-1);//获取输入缓冲区的索引
if (inputBufferIndex >= 0) {
ByteBuffer inputBuffer = inputBuffers[inputBufferIndex];
inputBuffer.clear();
inputBuffer.put(byteBuffer);//先获取缓冲区，再放入值
mediaCodec.queueInputBuffer(inputBufferIndex, 0, inputBuffer.position(), i * 1000000 / 30, 0);//四个参数，第一个是输入缓冲区的索引，第二个是放入的数据大小，第三个是时间戳，保证递增就是
i++;
}
int outputBufferIndex = mediaCodec.dequeueOutputBuffer(bufferInfo, 0);
Log.i(TAG, "run: "+outputBufferIndex);
while (outputBufferIndex >= 0) {
mediaCodec.releaseOutputBuffer(outputBufferIndex, true);//释放缓冲区解码的数据到surfaceview，一般到了这一步，surfaceview上就有画面了
outputBufferIndex = mediaCodec.dequeueOutputBuffer(bufferInfo, 0);
}
}