要在竖屏和横屏模式下剪辑Agora.io视频流，你可以使用Agora.io的视频剪辑SDK，并根据当前屏幕方向进行相应的处理。以下是一个示例代码，展示了如何在Android平台上实现这一功能：

import io.agora.rtc.RtcEngine;
import io.agora.rtc.video.VideoCanvas;

public class MainActivity extends AppCompatActivity {
    private RtcEngine mRtcEngine;
    private FrameLayout mVideoContainer;

    @Override
    protected void onCreate(Bundle savedInstanceState) {
        super.onCreate(savedInstanceState);
        setContentView(R.layout.activity_main);

        mVideoContainer = findViewById(R.id.video_container);

        // 初始化Agora.io SDK
        try {
            mRtcEngine = RtcEngine.create(getApplicationContext(), "YOUR_APP_ID", mRtcEventHandler);
            mRtcEngine.setChannelProfile(Constants.CHANNEL_PROFILE_LIVE_BROADCASTING);
            mRtcEngine.enableVideo();
        } catch (Exception e) {
            e.printStackTrace();
        }
    }

    @Override
    protected void onDestroy() {
        super.onDestroy();

        // 释放资源
        if (mRtcEngine != null) {
            mRtcEngine.leaveChannel();
            RtcEngine.destroy();
            mRtcEngine = null;
        }
    }

    // 根据屏幕方向设置视频剪辑布局
    private void setVideoLayout(int orientation) {
        if (mVideoContainer.getChildCount() > 0) {
            mVideoContainer.removeAllViews();
        }

        if (orientation == Configuration.ORIENTATION_PORTRAIT) {
            // 竖屏模式
            mRtcEngine.setVideoProfile(Constants.VIDEO_PROFILE_360P, false);
            FrameLayout.LayoutParams params = new FrameLayout.LayoutParams(ViewGroup.LayoutParams.MATCH_PARENT, ViewGroup.LayoutParams.MATCH_PARENT);
            mVideoContainer.addView(localVideoView, params);
        } else {
            // 横屏模式
            mRtcEngine.setVideoProfile(Constants.VIDEO_PROFILE_720P, false);
            FrameLayout.LayoutParams params = new FrameLayout.LayoutParams(ViewGroup.LayoutParams.MATCH_PARENT, ViewGroup.LayoutParams.MATCH_PARENT);
            params.width = getResources().getDisplayMetrics().widthPixels / 2;
            mVideoContainer.addView(localVideoView, params);
        }
    }

    // 监听屏幕方向变化
    @Override
    public void onConfigurationChanged(Configuration newConfig) {
        super.onConfigurationChanged(newConfig);

        if (newConfig.orientation == Configuration.ORIENTATION_PORTRAIT) {
            setVideoLayout(Configuration.ORIENTATION_PORTRAIT);
        } else if (newConfig.orientation == Configuration.ORIENTATION_LANDSCAPE) {
            setVideoLayout(Configuration.ORIENTATION_LANDSCAPE);
        }
    }

    // 实现Agora.io RtcEngineEventHandler接口
    private final IRtcEngineEventHandler mRtcEventHandler = new IRtcEngineEventHandler() {
        @Override
        public void onUserJoined(int uid, int elapsed) {
            super.onUserJoined(uid, elapsed);

            // 创建远程视频视图
            SurfaceView remoteVideoView = RtcEngine.CreateRendererView(getApplicationContext());
            mRtcEngine.setupRemoteVideo(new VideoCanvas(remoteVideoView, VideoCanvas.RENDER_MODE_FIT, uid));
            mVideoContainer.addView(remoteVideoView);
        }

        @Override
        public void onUserOffline(int uid, int reason) {
            super.onUserOffline(uid, reason);

            // 移除远程视频视图
            mVideoContainer.removeViewAt(uid);
        }
    };
}

请注意，以上代码仅为示例，你需要根据你的具体需求和平台进行相应的适配。同时，你需要替换代码中的"YOUR_APP_ID"为你自己的Agora.io应用ID。

希望以上代码能对你有所帮助！