Using ExoPlayer 2.6.1 (https://github.com/google/ExoPlayer)

R.raw.presentation is my presentation.mp4 file.
binding.videoPlayer is a SimpleExoPlayerView element in my xml view.

SimpleExoPlayer player = ExoPlayerFactory.newSimpleInstance(context, new DefaultTrackSelector());
binding.videoPlayer.setPlayer(player);

final RawResourceDataSource rawResourceDataSource = new RawResourceDataSource(context);
DataSpec dataSpec = new DataSpec(RawResourceDataSource.buildRawResourceUri(R.raw.presentation));
try {
    rawResourceDataSource.open(dataSpec);

    DataSource.Factory factory = new DataSource.Factory() {
        @Override
        public DataSource createDataSource() {
            return rawResourceDataSource;
        }
    };
    MediaSource videoSource = new ExtractorMediaSource.Factory(factory).createMediaSource(rawResourceDataSource.getUri());
    player.prepare(videoSource);

} catch (RawResourceDataSource.RawResourceDataSourceException e) {
    e.printStackTrace();
}

Based on other snippets:

• https://stackoverflow.com/questions/35675105/exoplayer-play-local-mp4-file-in-sd-card
• https://gist.github.com/scruffyfox/885cfbe77327d248a7e67f53b16bf079
• https://medium.com/@tonyowen/playing-local-r-raw-files-with-exoplayer2-1a62276ebeaa