media3/docs/rtsp.md

title
RTSP

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Using MediaItem

To play an RTSP stream, you need to depend on the RTSP module.

implementation 'com.google.android.exoplayer:exoplayer-rtsp:2.X.X'

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You can then create a MediaItem for an RTSP URI and pass it to the player.

// Create a player instance.
SimpleExoPlayer player = new SimpleExoPlayer.Builder(context).build();
// Set the media item to be played.
player.setMediaItem(MediaItem.fromUri(rtspUri));
// Prepare the player.
player.prepare();

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Using RtspMediaSource

For more customization options, you can create an RtspMediaSource and pass it directly to the player instead of a MediaItem.

// Create an RTSP media source pointing to an RTSP uri.
MediaSource mediaSource =
    new RtspMediaSource.Factory()
        .createMediaSource(MediaItem.fromUri(rtspUri));
// Create a player instance.
SimpleExoPlayer player = new SimpleExoPlayer.Builder(context).build();
// Set the media source to be played.
player.setMediaSource(mediaSource);
// Prepare the player.
player.prepare();

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Using RTSP behind NAT

ExoPlayer uses UDP as the default protocol for RTP transport.

When streaming RTSP behind a NAT layer, the NAT might not be able to forward the incoming RTP/UDP packets to the device. This occurs if the NAT lacks the necessary UDP port mapping. If ExoPlayer detects there have not been incoming RTP packets for a while and the playback has not started yet, ExoPlayer tears down the current RTSP playback session, and retries playback using RTP-over-RTSP (transmitting RTP packets using the TCP connection opened for RTSP).