SimpleExoPlayer play audio without video why?

I have a SimpleExoPlayer item in my TV application, when i run the activity the player works normally, the player has UDP mediaSource and all is fine when i go to another activity and come back to the current activity, the SimpleExoPlayer player play just audio without video this is my item

    <com.google.android.exoplayer2.ui.SimpleExoPlayerView
    android:id="@+id/player_view"
    android:layout_width="400dp"
    android:layout_height="310dp"
    app:shutter_background_color="@android:color/transparent"
    app:layout_constraintStart_toEndOf="@+id/tv_frame_content"
    android:layout_alignEnd="@+id/tv_frame_content"
    app:layout_constraintTop_toTopOf="@+id/tv_frame_content"
    app:layout_constraintBottom_toBottomOf="@+id/tv_frame_content"
    android:layout_gravity="center_vertical"
    android:layout_marginStart="50dp"
    app:keep_content_on_player_reset="true"
    android:layout_marginEnd="50dp"
    app:use_controller="false" />

this is how i play in onResume of my fragment

public void initPlayer(String url, PlayerView playerView, String activity) {
    if (url.isEmpty())
        Toast.makeText(getContext(), "Please enter a url", Toast.LENGTH_SHORT).show();

    else {
        playerView.setShutterBackgroundColor(Color.TRANSPARENT);
      //  playerView.setPlayer(null);
        //if (isPlaying2) {
        //   stopPlayer2();
        // } else {
        App.appendLog("PLAYING FROM :" + activity + "---" + url);
        Uri videoUri = Uri.parse(url);

        Toast.makeText(getContext(), url, Toast.LENGTH_SHORT).show();
        //Create a default TrackSelector
        DefaultTrackSelector trackSelector = new DefaultTrackSelector(new AdaptiveTrackSelection.Factory());

        trackSelector.setParameters(
                trackSelector.getParameters().buildUpon().setMaxVideoSizeSd()
                        .setPreferredTextLanguage("en")
                        .setPreferredAudioLanguage("en").build());


        //Create the player

        player = ExoPlayerFactory.newSimpleInstance(getContext(), trackSelector);


        // set player in playerView
        playerView.setPlayer(player);


        playerView.requestFocus();



        //Create default UDP Datasource
        DataSource.Factory factory = () -> new UdpDataSource(5000, 100000);
        //  ExtractorsFactory tsExtractorFactory = () -> new TsExtractor[]{new TsExtractor(MODE_SINGLE_PMT,
        //  new TimestampAdjuster(0), new DefaultTsPayloadReaderFactory())};
        MediaSource mediaSource = new ProgressiveMediaSource.Factory(factory)
                .createMediaSource(videoUri);
        // new ExtractorMediaSource(videoUri, factory, tsExtractorFactory, null, null);


        player.prepare(mediaSource);
        player.addListener(new Player.EventListener() {
            @Override
            public void onPlayerStateChanged(boolean playWhenReady, int playbackState) {
                Player.EventListener.super.onPlayerStateChanged(playWhenReady, playbackState);

                if (playWhenReady && playbackState == Player.STATE_READY) {
                    //  isPlaying2 = true;
                    // media actually playing
                } else if (playWhenReady) {
                    // might be idle (plays after prepare()),
                    // buffering (plays when data available)
                    // or ended (plays when seek away from end)
                } else {
                    // player paused in any state
                }
            }

            @Override
            public void onPlayerError(ExoPlaybackException error) {

                Player.EventListener.super.onPlayerError(error);
                App.appendLog("ERROR in player Main fragment: " + error + "");
                Toast.makeText(getContext(), error + "", Toast.LENGTH_LONG).show();
                //isPlaying2 = false;
            }


            @Override
            public void onSeekProcessed() {
                Player.EventListener.super.onSeekProcessed();

            }
        });
        // start play automatically when player is ready.
        player.setPlayWhenReady(true);
        playerView.setShutterBackgroundColor(Color.TRANSPARENT);
        player.addAnalyticsListener(new EventLogger(trackSelector));
    }
    //}
}

function stop player

    public void stopPlayer() {
      if (player != null) {

        player.stop();
        App.appendLog("STOPPED: ");

    }
}

these is something wrong !! cannot find any solution