Exoplayer playback error after interstitial ad

I am playing video with ExoPlayer and showing Google AdMob interstitial ad.

After ad has been gone there was trouble to play video and show error like:

Playback error.com.google.android.exoplayer2.ExoPlaybackException
   at com.google.android.exoplayer2.mediacodec.MediaCodecRenderer.throwDecoderInitError(MediaCodecRenderer.java:441)
   at com.google.android.exoplayer2.mediacodec.MediaCodecRenderer.maybeInitCodec(MediaCodecRenderer.java:428)
   at com.google.android.exoplayer2.mediacodec.MediaCodecRenderer.onInputFormatChanged(MediaCodecRenderer.java:920)
   at com.google.android.exoplayer2.video.MediaCodecVideoRenderer.onInputFormatChanged(MediaCodecVideoRenderer.java:503)
   at com.google.android.exoplayer2.mediacodec.MediaCodecRenderer.render(MediaCodecRenderer.java:557)
   at com.google.android.exoplayer2.ExoPlayerImplInternal.doSomeWork(ExoPlayerImplInternal.java:518)
   at com.google.android.exoplayer2.ExoPlayerImplInternal.handleMessage(ExoPlayerImplInternal.java:301)
   at android.os.Handler.dispatchMessage(Handler.java:102)
   at android.os.Looper.loop(Looper.java:193)
   at android.os.HandlerThread.run(HandlerThread.java:65)
Caused by: com.google.android.exoplayer2.mediacodec.MediaCodecRenderer$DecoderInitializationException: Decoder init failed: OMX.qcom.video.decoder.avc, Format(1, null, video/avc, -1, null, [720, 420, -1.0], [-1, -1])
   at com.google.android.exoplayer2.mediacodec.MediaCodecRenderer.maybeInitCodec(MediaCodecRenderer.java:428) 
   at com.google.android.exoplayer2.mediacodec.MediaCodecRenderer.onInputFormatChanged(MediaCodecRenderer.java:920) 
   at com.google.android.exoplayer2.video.MediaCodecVideoRenderer.onInputFormatChanged(MediaCodecVideoRenderer.java:503) 
   at com.google.android.exoplayer2.mediacodec.MediaCodecRenderer.render(MediaCodecRenderer.java:557) 
   at com.google.android.exoplayer2.ExoPlayerImplInternal.doSomeWork(ExoPlayerImplInternal.java:518) 
   at com.google.android.exoplayer2.ExoPlayerImplInternal.handleMessage(ExoPlayerImplInternal.java:301) 
   at android.os.Handler.dispatchMessage(Handler.java:102) 
   at android.os.Looper.loop(Looper.java:193) 
   at android.os.HandlerThread.run(HandlerThread.java:65) 

I am using libraries:

implementation 'com.google.android.exoplayer:exoplayer:2.8.1'
implementation 'com.google.android.exoplayer:exoplayer-ui:2.8.1'

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