问题
I want to change the encoding bitrate including H264 and AAC by Android MediaCodec dynamically , according to the current network.
How to update the encoding bitrate in Android MediaCodec dynamically ?
PS: I found PARAMETER_KEY_VIDEO_BITRATE and setParameters is available on API 19
PARAMETER_KEY_VIDEO_BITRATE
Change a video encoder's target bitrate on the fly. The value is an Integer object containing the new bitrate in bps.
Constant Value: "video-bitrate"
setParameters
Communicate additional parameter changes to the component instance.
Throws IllegalStateException if in the Uninitialized state.
Is there any way to do it under API 19 ?
回答1:
Stopping the Codec, setting the parameters and restarting it worked for me.
回答2:
Your format needs to support adaptive bitrate. Eg. I was able to set the bitrate using the following. Make sure you're in api 19 or above though.I was encoding the H264 frames into an FLV container.
Bundle bitrate = new Bundle();
bitrate.putInt(MediaCodec.PARAMETER_KEY_VIDEO_BITRATE, targetBitrate);
mEncoder.setParameters(bitrate);
来源：https://stackoverflow.com/questions/31823231/how-to-change-mediacodec-encoding-bitrate-on-the-fly-while-streaming-in-android