smoothstreaming failed with 2.11.2

[DarkAnakin]

[REQUIRED] Issue description

smoothstreaming videos failed to play with the version 2.11.2

[REQUIRED] Reproduction steps

play Super speed demo

Caused by: java.lang.NullPointerException
        at java.util.Collections$UnmodifiableCollection.<init>(Collections.java:1068)
        at java.util.Collections$UnmodifiableList.<init>(Collections.java:1344)
        at java.util.Collections.unmodifiableList(Collections.java:1331)
        at com.google.android.exoplayer2.extractor.mp4.FragmentedMp4Extractor.<init>(FragmentedMp4Extractor.java:251)
at com.google.android.exoplayer2.extractor.mp4.FragmentedMp4Extractor.<init>(FragmentedMp4Extractor.java:223)
        at com.google.android.exoplayer2.source.smoothstreaming.DefaultSsChunkSource.<init>(DefaultSsChunkSource.java:116)
        at com.google.android.exoplayer2.source.smoothstreaming.DefaultSsChunkSource$Factory.createChunkSource(DefaultSsChunkSource.java:69)

[ojw28]

Thanks for the report. SmoothStreaming isn't as widely used as the other streaming standards we support (i.e., DASH and HLS), and we need to put some better testing in place for it.

We will create a 2.11.3 release shortly that includes the fix. We've also added DefaultSsChunkSouce to the nullness tests that we run internally, which would have caught this, and will be working on putting some better playback tests in place for SmoothStreaming going forward.