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Release notes for 2.0.0 (and 1.5.11)

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RELEASENOTES.md
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# Release notes #
### r2.x ###
### r2.0.0 ###
ExoPlayer 2.x is a major rewrite that's still under development. We suggest
following our [Medium page](https://medium.com/google-exoplayer) to learn more,
as we work toward writing more complete documentation and the first 2.x release.
ExoPlayer 2.x is a major iteration of the library. It includes significant API
and architectural changes, new features and many bug fixes. You can read about
some of the motivations behind ExoPlayer 2.x
[here](https://medium.com/google-exoplayer/exoplayer-2-x-why-what-and-when-74fd9cb139#.am7h8nytm).
* Root package name changed to `com.google.android.exoplayer2`. The library
structure and class names have also been sanitized. Read more
[here](https://medium.com/google-exoplayer/exoplayer-2-x-new-package-and-class-names-ef8e1d9ba96f#.lv8sd4nez).
* Key architectural changes:
* Late binding between rendering and media source components. Allows the same
rendering components to be re-used from one playback to another. Enables
features such as gapless playback through playlists and DASH multi-period
support.
* Improved track selection design. More details can be found
[here](https://medium.com/google-exoplayer/exoplayer-2-x-track-selection-2b62ff712cc9#.n00zo76b6).
* LoadControl now used to control buffering and loading across all playback
types.
* Media source components given additional structure. A new MediaSource class
has been introduced. MediaSources expose Timelines that describe the media
they expose, and can consist of multiple MediaPeriods. This enables features
such as seeking in live playbacks and DASH multi-period support.
* Responsibility for loading the initial DASH/SmoothStreaming/HLS manifest is
promoted to the corresponding MediaSource components and is no longer the
application's responsibility.
* Higher level abstractions such as SimpleExoPlayer have been added to the
library. These make the library easier to use for common use cases. The demo
app is halved in size as a result, whilst at the same time gaining more
functionality. Read more
[here](https://medium.com/google-exoplayer/exoplayer-2-x-improved-demo-app-d97171aaaaa1).
* Enhanced library support for implementing audio extensions. Read more
[here](https://medium.com/google-exoplayer/exoplayer-2-x-new-audio-features-cfb26c2883a#.ua75vu4s3).
* Format and MediaFormat are replaced by a single Format class.
* Key new features:
* Playlist support. Includes support for gapless playback between playlist
items and consistent application of LoadControl and TrackSelector policies
when transitioning between items
([#1270](https://github.com/google/ExoPlayer/issues/1270)).
* Seeking in live playbacks for DASH and SmoothStreaming
([#291](https://github.com/google/ExoPlayer/issues/291)).
* DASH multi-period support
([#557](https://github.com/google/ExoPlayer/issues/557)).
* MediaSource composition allows MediaSources to be concatenated into a
playlist, merged and looped. Read more
[here](https://medium.com/google-exoplayer/exoplayer-2-x-mediasource-composition-6c285fcbca1f#.zfha8qupz).
* Looping support (see above)
([#490](https://github.com/google/ExoPlayer/issues/490)).
* Ability to query information about all tracks in a piece of media (including
those not supported by the device)
([#1121](https://github.com/google/ExoPlayer/issues/1121)).
* Improved player controls.
* Support for PSSH in fMP4 moof atoms
([#1143](https://github.com/google/ExoPlayer/issues/1143)).
* Support for Opus in Ogg
([#1447](https://github.com/google/ExoPlayer/issues/1447)).
* CacheDataSource support for standalone media file playbacks (mp3, mp4 etc).
* FFMPEG extension (for audio only).
* Key bug fixes:
* Removed unnecessary secondary requests when playing standalone media files
([#1041](https://github.com/google/ExoPlayer/issues/1041)).
* Fixed playback of video only (i.e. no audio) live streams
([#758](https://github.com/google/ExoPlayer/issues/758)).
* Fixed silent failure when media buffer is too small
([#583](https://github.com/google/ExoPlayer/issues/583)).
* Suppressed "Sending message to a Handler on a dead thread" warnings
([#426](https://github.com/google/ExoPlayer/issues/426)).
### r1.5.11 ###
* Cronet network stack extension.
* HLS: Fix propagation of language for alternative audio renditions
([#1784](https://github.com/google/ExoPlayer/issues/1784)).
* WebM: Support for subsample encryption.
* ID3: Fix EOS detection for 2-byte encodings
([#1774](https://github.com/google/ExoPlayer/issues/1774)).
* MPEG-TS: Support multiple tracks of the same type.
* MPEG-TS: Work toward robust handling of stream corruption.
* Fix ContentDataSource failures triggered by garbage collector
([#1759](https://github.com/google/ExoPlayer/issues/1759)).
### r1.5.10 ###