Android MediaCodec Format设置讨论贴

樱桃火 2015-11-06 11:55:23

需要怎么设置MediaCodec的编码参数，比如码流帧率



MediaFormat mediaFormat = MediaFormat.createVideoFormat(MIME_TYPE, 1280, 720);

		mediaFormat.setInteger(MediaFormat.KEY_COLOR_FORMAT, mColorFormat);

		mediaFormat.setInteger(MediaFormat.KEY_BIT_RATE, BIT_RATE);

		mediaFormat.setInteger(MediaFormat.KEY_FRAME_RATE, FRAME_RATE);		

		mediaFormat.setInteger(MediaFormat.KEY_I_FRAME_INTERVAL,IFRAME_INTERVAL);

		mMediaCodec = MediaCodec.createByCodecName(codecInfo.getName());

		mMediaCodec.configure(mediaFormat, null, null,MediaCodec.CONFIGURE_FLAG_ENCODE);

在这里设置的format 参数为什么无效， 经过编码后输出的新格式不是Format参数

if (outputBufferIndex == MediaCodec.INFO_TRY_AGAIN_LATER) {

				// no output available yet

					Log.d(TAG, "no output from encoder available");

			} else if (outputBufferIndex == MediaCodec.INFO_OUTPUT_BUFFERS_CHANGED) {

				// not expected for an encoder

				outputBuffers = mMediaCodec.getOutputBuffers();

					Log.d(TAG, "encoder output buffers changed");

		} else if (outputBufferIndex == MediaCodec.INFO_OUTPUT_FORMAT_CHANGED) {

				// not expected for an encoder

			// should happen before receiving buffers, and should only happen once

	            if (mMuxerStarted) {

	                throw new RuntimeException("format changed twice");

	            }            

		MediaFormat newFormat = mMediaCodec.getOutputFormat();//这一行得到的新的Format不是前面自己设置的参数

                Log.d(TAG, "encoder output format changed: " + newFormat);