From 0e992370752e8570c330f70d83d5dd34a09e4228 Mon Sep 17 00:00:00 2001
From: zhihuichen <zhihuichen@google.com>
Date: Tue, 24 Jan 2017 13:14:46 -0800
Subject: [PATCH] Allow duplicate tracks in WebM/MKV extractor

-------------
Created by MOE: https://github.com/google/moe
MOE_MIGRATED_REVID=145457836
---
 .../android/exoplayer2/extractor/mkv/MatroskaExtractor.java   | 4 +---
 1 file changed, 1 insertion(+), 3 deletions(-)

diff --git a/library/src/main/java/com/google/android/exoplayer2/extractor/mkv/MatroskaExtractor.java b/library/src/main/java/com/google/android/exoplayer2/extractor/mkv/MatroskaExtractor.java
index ccf78e6bc6..970335e9d2 100644
--- a/library/src/main/java/com/google/android/exoplayer2/extractor/mkv/MatroskaExtractor.java
+++ b/library/src/main/java/com/google/android/exoplayer2/extractor/mkv/MatroskaExtractor.java
@@ -529,11 +529,9 @@ public final class MatroskaExtractor implements Extractor {
         }
         break;
       case ID_TRACK_ENTRY:
-        if (tracks.get(currentTrack.number) == null && isCodecSupported(currentTrack.codecId)) {
+        if (isCodecSupported(currentTrack.codecId)) {
           currentTrack.initializeOutput(extractorOutput, currentTrack.number);
           tracks.put(currentTrack.number, currentTrack);
-        } else {
-          // We've seen this track entry before, or the codec is unsupported. Do nothing.
         }
         currentTrack = null;
         break;