RTSP: One of more mandatory SDP fields are not set

When filing a question:
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Describe your question in detail.
use ExoPlayer play rtspUri，cant play，error is “One of more mandatory SDP fields are not set ” **timing is null**

the rtsp url from camera is “rtsp://192.168.1.168/main”

the reason maybe is fromthe video from the camera ， how to solve it？if the reason is from the camera ， how to set the camera ？or other way to solve it is？

- Output of running `$ adb bugreport` in the console

```
Playback error
com.google.android.exoplayer2.ExoPlaybackException: Source error
at com.google.android.exoplayer2.ExoPlayerImplInternal.handleIoException(ExoPlayerImplInternal.java:640)
at com.google.android.exoplayer2.ExoPlayerImplInternal.handleMessage(ExoPlayerImplInternal.java:616)
at android.os.Handler.dispatchMessage(Handler.java:108)
at android.os.Looper.loop(Looper.java:216)
at android.os.HandlerThread.run(HandlerThread.java:65)

Caused by: java.io.IOException: com.google.android.exoplayer2.ParserException
at com.google.android.exoplayer2.source.rtsp.RtspMediaPeriod$InternalListener.onSessionTimelineRequestFailed(RtspMediaPeriod.java:652)
at com.google.android.exoplayer2.source.rtsp.RtspClient.dispatchRtspError(RtspClient.java:317)
at com.google.android.exoplayer2.source.rtsp.RtspClient.access$700(RtspClient.java:75)
at com.google.android.exoplayer2.source.rtsp.RtspClient$MessageListener.handleRtspResponse(RtspClient.java:656)
at com.google.android.exoplayer2.source.rtsp.RtspClient$MessageListener.handleRtspMessage(RtspClient.java:507)
at com.google.android.exoplayer2.source.rtsp.RtspClient$MessageListener.lambda$onRtspMessageReceived$0$com-google-android-exoplayer2-source-rtsp-RtspClient$MessageListener(RtspClient.java:500)
at com.google.android.exoplayer2.source.rtsp.RtspClient$MessageListener$$ExternalSyntheticLambda0.run(Unknown Source:4)
at android.os.Handler.handleCallback(Handler.java:907)

Caused by: com.google.android.exoplayer2.source.rtsp.RtspMediaSource$RtspPlaybackException: com.google.android.exoplayer2.ParserException

Caused by: com.google.android.exoplayer2.ParserException
at com.google.android.exoplayer2.source.rtsp.SessionDescriptionParser.parse

Caused by: java.lang.IllegalStateException: One of more mandatory SDP fields are not set.
```

In case your question is related to a piece of media:

video from camera cant cant provide

Don't forget to check supported formats and devices
nothing to do with devices