Update release notes for 1.4.0-alpha02

PiperOrigin-RevId: 640138307
(cherry picked from commit deb3c96)

Author: tianyif

RELEASENOTES.md

@@ -1,6 +1,11 @@
 # Release notes
 
-### Unreleased changes
+## 1.4
+
+### 1.4.0-alpha02 (2024-06-06)
+
+This release includes the following changes since the
+[1.4.0-alpha01 release](#140-alpha01-2024-04-11):
 
 *   Common Library:
     *   Forward presumed no-op seek calls to the protected `BasePlayer.seekTo`
@@ -46,8 +51,8 @@
         You can enable this using `experimentalSetDynamicSchedulingEnabled` when
         setting up your ExoPlayer instance.
     *   Add `Renderer.getDurationToProgressMs`. A `Renderer` can implement this
-        method to return to ExoPlayer the duration that playback must advance in
-        order for the renderer to progress. If `ExoPlayer` is set with
+        method to return to ExoPlayer the duration that playback must advance
+        for the renderer to progress. If `ExoPlayer` is set with
         `experimentalSetDynamicSchedulingEnabled` then `ExoPlayer` will call
         this method when calculating the time to schedule its work task.
     *   Add `MediaCodecAdapter#OnBufferAvailableListener` to alert when input
@@ -56,8 +61,6 @@
         callbacks and if `ExoPlayer` is set with
         `experimentalSetDynamicSchedulingEnabled`, then `ExoPlayer` will
         schedule its work loop as renderers can make progress.
-    *   Fix bug where enabling CMCD for HLS with initialization segments
-        resulted in `Source Error` and `IllegalArgumentException`.
     *   Use data class for `LoadControl` methods instead of individual
         parameters.
 *   Transformer:
@@ -71,7 +74,6 @@
     *   Fix HEIC image loading from content URI schemes.
         ([#1373](https://github.com/androidx/media/issues/1373)).
     *   Adjust audio track duration in `AudioGraphInput` to improve AV sync.
-*   Track Selection:
 *   Extractors:
     *   MPEG-TS: Roll forward the change ensuring the last frame is rendered by
         passing the last access unit of a stream to the sample queue
@@ -165,15 +167,14 @@
         `ExoPlayer#setVideoEffects`
         ([#821](https://github.com/androidx/media/issues/821)).
     *   Change default SDR color working space from linear colors to electrical
-        BT 709 SDR video. Also provides third option to retain the original
+        BT 709 SDR video. Also provide third option to retain the original
         colorspace.
     *   Allow defining indeterminate z-order of EditedMediaItemSequences
         ([#1055](https://github.com/androidx/media/pull/1055)).
-    *   Maintain a consistent luminance range across different HDR content (uses
-        the HLG range).
+    *   Maintain a consistent luminance range across different pieces of HDR
+        content (uses the HLG range).
     *   Add support for Ultra HDR (bitmap) overlays on HDR content.
     *   Allow `SeparableConvolution` effects to be used before API 26.
-*   Muxers:
 *   IMA extension:
     *   Promote API that is required for apps to play
         [DAI ad streams](https://developers.google.com/ad-manager/dynamic-ad-insertion/full-service)
@@ -200,37 +201,30 @@
         is used to update the `PlaybackState` of the platform session to an
         error state with the given error information
         ([#543](https://github.com/androidx/media/issues/543)).
-*   UI:
-*   Downloads:
-*   OkHttp Extension:
 *   Cronet Extension:
     *   Fix `SocketTimeoutException` in `CronetDataSource`. In some versions of
         Cronet, the request provided by the callback is not always the same.
         This leads to callback not completing and request timing out
         (https://issuetracker.google.com/328442628).
-*   RTMP Extension:
 *   HLS Extension:
     *   Fix bug where pending EMSG samples waiting for a discontinuity were
         delegated in `HlsSampleStreamWrapper` with an incorrect offset causing
         an `IndexOutOfBoundsException` or an `IllegalArgumentException`
         ([#1002](https://github.com/androidx/media/issues/1002)).
     *   Fix bug where non-primary playlists keep reloading for LL-HLS streams
         ([#1240](https://github.com/androidx/media/issues/1240)).
+    *   Fix bug where enabling CMCD for HLS with initialization segments
+        resulted in `Source Error` and `IllegalArgumentException`.
 *   DASH Extension:
     *   Fix bug where re-preparing a multi-period live stream can throw an
         `IndexOutOfBoundsException`
         ([#1329](https://github.com/androidx/media/issues/1329)).
     *   Add support for `dashif:Laurl` license urls
         ([#1345](https://github.com/androidx/media/issues/1345)).
-*   Smooth Streaming Extension:
-*   RTSP Extension:
-*   Decoder Extensions (FFmpeg, VP9, AV1, MIDI, etc.):
-*   Leanback extension:
 *   Cast Extension:
     *   Fix bug that converted the album title of the `MediaQueueItem` to the
         artist in the Media3 media item
         ([#1255](https://github.com/androidx/media/pull/1255)).
-*   Test Utilities:
 *   Demo app:
     *   Allow setting repeat mode with `Intent` arguments from command line
         ([#1266](https://github.com/androidx/media/pull/1266)).
@@ -263,8 +257,6 @@
         the equivalent IntDef and constants in `androidx.media3.common.C`
         instead (e.g. `C.FORMAT_HANDLED`).
 
-## 1.4
-
 ### 1.4.0-alpha01 (2024-04-11)
 
 This release includes the following changes since the