exoplayer-intro | Media Streaming with ExoPlayer codelab | Media library

In my video player when i try to play MKV Matroska file it stay still the video is not playing.

i followed CodeLabs and ExoPlayer Dev and build player it can play .MP4 but unable to play .MKV

here is my player:(exoplayer 2.11.5)

I am working on a video streaming application, where I have to stream .mp4 videos. I am using exoplayer to play the videos. The problem is in low bandwidth connections the videos are buffering. so I wanted to implement adaptive streaming. I have checked the documentation and implemented similar to this. But the streaming did not work. So I have checked documentation of HLS streaming and Dashed streaming. but HLS streaming requires m3u8 file and Dash streaming requires .mpd format however mine is .mp4. is there any workaround or methods so that I can implement adaptive streaming ?

I have a Fragment which contains an instance of Exoplayer which I provide with Dagger 2 like this: @Inject SimpleExoPlayer mPlayer;

For the most part, this works well, I can play stuff on my player, the state is correctly restored on lifecycle changes, etc.

The issue I have is that when I click on the Overview button, navigate to another app, and then back, the player is in a black screen state where the seek bar has been restored to its saved position, but it will not play anything, nor respond to play commands on the UI, and just stays black until the Fragment gets recreated.

I am now trying to modify things to get my code to deal with the player just like in this code lab:

I have implemented the ExoPlayer in my application using the example from the Codelab : https://codelabs.developers.google.com/codelabs/exoplayer-intro/#3, algo with the example from https://medium.com/google-exoplayer/playing-ads-with-exoplayer-and-ima-868dfd767ea, the only difference is that I use AdsMediaSource instead of the deprecated ImaAdsMediaSource. My Implementation is this:

Currently i have created SimpleExoplayer using below https://github.com/googlecodelabs/exoplayer-intro/tree/master/exoplayer-codelab-01

UI for SimpleExoplayer has video view and controls.

Removing and/or customizing video view did not worked properly. Any use case of SimpleExoplayer only with Audio controls and no Video view.