mediaCodec.dequeueOutputBuffer(b,0)返回值一直是-1

Question

我使用MediaCodec进行硬编码时候无法拿到outputBufferIndex。
ByteBuffer[] inputBuffers = mediaCodec.getInputBuffers();
ByteBuffer[] outputBuffers = mediaCodec.getOutputBuffers();
int inputBufferIndex = mediaCodec.dequeueInputBuffer(0);

if (inputBufferIndex >= 0) {
ByteBuffer inputBuffer = inputBuffers[inputBufferIndex];
inputBuffer.clear();
inputBuffer.put(yuv420);
mediaCodec.queueInputBuffer(inputBufferIndex, 0, yuv420.length, 0, MediaCodec.BUFFER_FLAG_SYNC_FRAME);
}

MediaCodec.BufferInfo bufferInfo = new MediaCodec.BufferInfo();
int outputBufferIndex = mediaCodec.dequeueOutputBuffer(bufferInfo, 0); //此处在第一次的时候返回了正常的值，之后一直返回-1

Answer 1

https://blog.csdn.net/yifuzhiming/article/details/80109117