I want to know about Android push streaming

private void initRecoder(String url,int width,int height,int frameRate) {
        try {
            recorder = FrameRecorder.createDefault(url, width, height);
        } catch (FrameRecorder.Exception e) {
            e.printStackTrace();
        }
        recorder.setVideoCodec(avcodec.AV_CODEC_ID_H264); // avcodec.AV_CODEC_ID_H264，编码
        recorder.setFormat("flv");//封装格式，如果是推送到rtmp就必须是flv封装格式
        recorder.setFrameRate(frameRate);

        try {
            recorder.start();

            AndroidFrameConverter converter = new AndroidFrameConverter();
            long startTime = System.currentTimeMillis();
            long videoTS;
            Frame rotatedFrame;
            while (true) {
                rotatedFrame = converter.convert(mTextureView.getBitmap());
                //  rotatedFrame = converter.convert(grabbedImage);
                if (startTime == 0) {
                    startTime = System.currentTimeMillis();
                }
                videoTS = 1000 * (System.currentTimeMillis() - startTime);
                recorder.setTimestamp(videoTS);
                Log.i("frame", videoTS + ":" + rotatedFrame.toString());
                try {
                    recorder.record(rotatedFrame);
                    Thread.sleep(40);
                } catch (FrameRecorder.Exception e) {
                    e.printStackTrace();
                } catch (InterruptedException e) {
                    e.printStackTrace();
                }
            }
        } catch (FrameRecorder.Exception ex) {
            ex.printStackTrace();
        }

    }

error:

org.bytedeco.javacv.FrameRecorder$Exception: avcodec_open2() error -542398533: Could not open video codec.