Android 本地视频加载（FFmpegMediaMetadataRetriever）

使用库：FFmpegMediaMetadataRetriever（）

相关版本：

 

 

0、配置FFmpegMediaMetadataRetriever库

app中的build.gradle中添加dependencies,可以直接下载arr（https://github.com/wseemann/FFmpegMediaMetadataRetriever/releases）放到libs目录中（我下载的是1.0.14），也可以直接网上加载（上边注释掉的），然后主函数中加载（import wseemann.media.FFmpegMediaMetadataRetriever;）。

apply plugin: 'com.android.application'

android {
    //compileSdkVersion 24
  //  buildToolsVersion "29.0.2"

    compileSdkVersion 29
    buildToolsVersion "28.0.3"

    defaultConfig {
        applicationId "com.tencent.mobilenetssdncnn"
        archivesBaseName = "$applicationId"

        ndk {
            moduleName "ncnn"
            abiFilters "armeabi-v7a", "arm64-v8a"
        }
        minSdkVersion 24

    }

    externalNativeBuild {
        cmake {
            version "3.10.2"
            path file('src/main/jni/CMakeLists.txt')
        }
    }
    repositories {
        flatDir {
            dirs 'libs'
        }
    }
}

//dependencies {
//    implementation 'com.github.wseemann:FFmpegMediaMetadataRetriever-core:1.0.16'
//    implementation 'com.github.wseemann:FFmpegMediaMetadataRetriever-native:1.0.16'
//}

dependencies {
    //noinspection GradleCompatible
    implementation('com.android.support:support-v4:27.1.0')
    implementation(name:'all-fmmrhttp',ext:'aar')
    //implementation(name:'FFmpegMediaMetadataRetriever-core:1.0.15',ext:'aar')

}

库加载成功可以在externalLibraries中看到：

 

 

1、申请权限（必须有申请权限），打开本地视频

Button buttonVideo = (Button)findViewById(R.id.buttonVideo);
        buttonVideo.setOnClickListener(new View.OnClickListener() {
            @Override
            public void onClick(View arg0) {
                int permission = ActivityCompat.checkSelfPermission(MainActivity.this, Manifest.permission.READ_EXTERNAL_STORAGE);
                if (permission != PackageManager.PERMISSION_GRANTED) {
                    ActivityCompat.requestPermissions(
                            MainActivity.this,
                            new String[]{Manifest.permission.READ_EXTERNAL_STORAGE},
                            777
                    );
                } else {
                    Intent intent = new Intent(Intent.ACTION_PICK);
                    intent.setType("video/*");
                    startActivityForResult(intent, SELECT_VIDEO);
                }

//                Intent intent = new Intent(Intent.ACTION_PICK);
//                intent.setType("video/*");
//                startActivityForResult(intent, SELECT_VIDEO);
            }
        });

问题记录：刚开始没申请权限，虽然有路径，但是后面的mmr.setDataSource(path)加载的时候会出错。

2、加载视频

Thread thread = new Thread(new Runnable() {
            @Override
            public void run() {
                mmr = new FFmpegMediaMetadataRetriever();
                mmr.setDataSource(path);
                String dur = mmr.extractMetadata(FFmpegMediaMetadataRetriever.METADATA_KEY_DURATION);  // ms
                String sfps = mmr.extractMetadata(FFmpegMediaMetadataRetriever.METADATA_KEY_FRAMERATE);  // fps
                String rota = mmr.extractMetadata(FFmpegMediaMetadataRetriever.METADATA_KEY_VIDEO_ROTATION);  // rotation
                int duration = Integer.parseInt(dur);
                float fps = Float.parseFloat(sfps);
                float rotate = 0;
                if (rota != null) {
                    rotate = Float.parseFloat(rota);
                }
                //sbVideo.setMax(duration * 1000);
                float frameDis = 1.0f / fps * 1000 * 1000 * videoSpeed;
                videoCurFrameLoc = 0;

                while (detectVideo.get() && (videoCurFrameLoc) < (duration * 1000)) {
                    videoCurFrameLoc = (long) (videoCurFrameLoc + frameDis);
                    // sbVideo.setProgress((int) videoCurFrameLoc);
                    // final Bitmap b = mmr.getFrameAtTime(videoCurFrameLoc, FFmpegMediaMetadataRetriever.OPTION_CLOSEST);
                    bitmap = mmr.getFrameAtTime(videoCurFrameLoc, FFmpegMediaMetadataRetriever.OPTION_CLOSEST);
                    if (bitmap == null) {
                        continue;
                    }
                    Matrix matrix = new Matrix();
                    matrix.postRotate(rotate);
                    yourSelectedImage = bitmap.copy(Bitmap.Config.ARGB_8888, true);
                    startTime = System.currentTimeMillis();
                    MobilenetSSDNcnn.Obj[] objects = mobilenetssdncnn.Detect(yourSelectedImage, false,true,true);
//                    final long durT = System.currentTimeMillis() - start;
                    showObjects(objects);
                    frameDis = 1.0f / fps * 1000 * 1000 * videoSpeed;
                }
                mmr.release();

                if (detectVideo.get()) {
                    runOnUiThread(new Runnable() {
                        @Override
                        public void run() {
                            sbVideo.setVisibility(View.GONE);
                            sbVideoSpeed.setVisibility(View.GONE);
                            Toast.makeText(MainActivity.this, "Video end!", Toast.LENGTH_LONG).show();
                        }
                    });
                }
                detectVideo.set(false);
            }
        }, "video detect");
        thread.start();