Play AES encrypted video in ExoPlayer offline

I am trying to play from local storage an encrypted video using ExoPlayer. The command used to encrypt the video using FFMPEG is as follows:

-i /storage/emulated/0/Download/20210125_193031.mp4 -vcodec copy -acodec copy -c:v libx264 -encryption_scheme cenc-aes-ctr -encryption_key b42ca3172ee4e69bf51848a59db9cd13 -encryption_kid 09e367028f33436ca5dd60ffe6671e70 /storage/emulated/0/Download/out_enc.mp4

Here it is the sourcecode of my player:

public class PlayerActivity extends AppCompatActivity {      private SimpleExoPlayer player;      private DefaultDrmSessionManager drmSessionManager;        @Override      protected void onCreate(final Bundle savedInstanceState) {          super.onCreate(savedInstanceState);            setContentView(R.layout.activity_player);          // Build the media item.          PlayerView playerView = findViewById(R.id.video_view);          player = new SimpleExoPlayer.Builder(this).build();          playerView.setPlayer(player);          //player.prepare();          //FFMPEG command: -i /storage/emulated/0/Download/20210125_193031.mp4 -vf scale=-1:720 -c:v libx264 -encryption_scheme cenc-aes-ctr -encryption_key b42ca3172ee4e69bf51848a59db9cd13 -encryption_kid 09e367028f33436ca5dd60ffe6671e70 /storage/emulated/0/Download/out_enc.mp4          //base 64 keys generated from: https://www.base64encode.org/          //playVideo("/storage/emulated/0/Download/out_enc.mp4", "MDllMzY3MDI4ZjMzNDM2Y2E1ZGQ2MGZmZTY2NzFlNzA=", "YjQyY2EzMTcyZWU0ZTY5YmY1MTg0OGE1OWRiOWNkMTM=");          playVideo("/storage/emulated/0/Download/out_enc.mp4", "CeNnAo8zQ2yl3WD/5mcecA", "tCyjFy7k5pv1GEilnbnNEw");      }        private void playVideo(String url, String keyID, String keyValue) {          try {              drmSessionManager = buildDrmSessionManager(Util.getDrmUuid(C.CLEARKEY_UUID.toString()), true, keyID, keyValue              );          } catch (Exception e) {              e.printStackTrace();          }          player.setMediaSource(buildDashMediaSource(Uri.parse(url)));          player.prepare();          player.setPlayWhenReady(true);      }        private MediaSource buildDashMediaSource(Uri uri) {          DefaultDataSourceFactory dashChunkSourceFactory = new DefaultDataSourceFactory(this, "agent");          return new ProgressiveMediaSource.Factory(dashChunkSourceFactory)                  .setDrmSessionManager(drmSessionManager)                  .createMediaSource(uri);      }        private DefaultDrmSessionManager buildDrmSessionManager(UUID uuid, Boolean multiSession, String id, String value) {  /*        String base64Id = Base64.encodeToString(id.getBytes(), Base64.DEFAULT);          String base64Value = Base64.encodeToString(value.getBytes(), Base64.DEFAULT);*/          String keyString = "{\"keys\":[{\"kty\":\"oct\",\"k\":\""+value+"\",\"kid\":\""+id+"\"}],\"type\":\"temporary\"}";;          LocalMediaDrmCallback drmCallback = new LocalMediaDrmCallback(keyString.getBytes());          FrameworkMediaDrm mediaDrm = null;          try {              mediaDrm = FrameworkMediaDrm.newInstance(uuid);          } catch (UnsupportedDrmException e) {              e.printStackTrace();          }          return new DefaultDrmSessionManager(uuid, mediaDrm, drmCallback, null, multiSession);      }        @Override      protected void onDestroy() {          player.release();          super.onDestroy();      }  

Here it is the link for the encrypted video. The main issue: the video is playing but is not decrypted. What am I missing?

https://stackoverflow.com/questions/65950956/play-aes-encrypted-video-in-exoplayer-offline January 29, 2021 at 04:19PM