Cross platform using multibyte character sets （PC、Android、IOS、WP） code / Decoding method.

Solutions : utilize GPU Decode HD video, Reduce the cost of decoding CPU resources, Accelerate the solution. Problem description : In the project, Need to analyze and process HD surveillance video, After testing, The decoding process takes up CPU More resources, This leads to the inefficiency of the whole system, Decoding becomes the bottleneck of the system. Creating MediaCodec When instantiating, In addition to setting the required parameters, We should also pay attention to some places, such as, Choose which encoder, In general, we will choose the following ：Īndroid Hardware codec and software codec more related articles Either format, It all needs to be transformed into yuv420sp or yuv420p( Be careful ： In transcoding, Best use jni, use C/C++ Let's change the format, It's a lot more efficient ), Talent MediaCodec code, Then save h.264 file. Achieve this requirement, First, the data from the camera, If you use Camera, Generally set as NV21 Format, But some people use Camera2, The format is IMAGE. Just said, Some models can't be used MediaExtractor Parsing h.264 file, To be compatible with most models, You need to analyze it yourself, Through analysis h.264 Each byte of the file distinguishes the position of each frame and what type of frame it is. A few days ago, I joined Tencent 2017LIVE Live Developer Conference, come to know, Most of the live broadcast now uses hardware to encode and decode. When the software codec is not suitable, We can only consider hardware encoding and decoding (MediaCodec).

Android video codec