利用aliyun sdk专业版实现生成视频缩略图

1. 导入aliyun sdk

1. 工程中点File->New-> Import moudle   选择下载下来的AliyunSDK-RCE

2. 在build.gradle中添加

dependencies {
    implementation project(':AliyunSdk-RCE')
}

3. 将下载下来的sdk中的Libs文件夹 copy到工程src/main/jniLibs/下，在build.gradle中添加

    sourceSets.main {
        jni.srcDirs = []
        jniLibs.srcDir "src/main/jniLibs"
    }

4. 在app的Application类中导入sdk的核心so库：

public class MainApplication extends Application {
    @Override
    public void onCreate() {
        super.onCreate();
        System.loadLibrary("live-openh264");
        System.loadLibrary("QuCore-ThirdParty");
        System.loadLibrary("QuCore");
    }
}

2. 实现生成视频缩略图

1. 调用系统的Intent.ACTION_PICK选择视频

    private void choiceVideo() {
        Intent i = new Intent(Intent.ACTION_PICK, android.provider.MediaStore.Video.Media.EXTERNAL_CONTENT_URI);
        startActivityForResult(i, 66);
    }

2. 获取选择视频的MediaInfo duration，通过android.media.MediaMetadataRetriever系统类获取

        try {
            if (path != null) {
                mmr.setDataSource(path);
            }
            duration = mmr.extractMetadata(android.media.MediaMetadataRetriever.METADATA_KEY_DURATION);
        } catch (Exception ex) {
        } finally {
            mmr.release();
        }

3. 实例化aliyun提供的api AliyunIThumbnailFetcher，设置params 生成的缩略图的大小，之后调用requestThumbnailImage，传入要获取某一duration时间点，通过回调方法onThumbnailReady获取com.aliyun.common.media.ShareableBitmap

        AliyunIThumbnailFetcher mThumbnailFetcher = AliyunThumbnailFetcherFactory.createThumbnailFetcher();
        ...
        if (!path.equalsIgnoreCase("")) {
            mThumbnailFetcher.addVideoSource(path, 0, duration);
        }
        ...
        int ret = mThumbnailFetcher.setParameters(width, 240, AliyunIThumbnailFetcher.CropMode.Mediate, ScaleMode.LB, 300);

4. shareableBitmap.getData()可获取缩略图bitmap，最后显示到ImageView中

                new AliyunIThumbnailFetcher.OnThumbnailCompletion() {
                    @Override
                    public void onThumbnailReady(com.aliyun.common.media.ShareableBitmap shareableBitmap, long l) {
                        Log.v(TAG, "getThumbNail callback time = " + l);
                        ImageView thumbnail = (ImageView) findViewById(R.id.thumbnail);
                        thumbnail.setImageBitmap(shareableBitmap.getData());

                    }
                    @Override
                    public void onError(int code) {
                        Log.e(TAG, "getThumbNail error code = " + code);

                    }
                });

视频地址：
http://v.youku.com/v_show/id_XMzU4NTkxNzA5Mg==.html?spm=a2hww.20027244.uerCenter.5!3~5~5!2~5~DL~DD~A