From 94bf9fa81d836b25cb893cf09e71045b3bbeef8a Mon Sep 17 00:00:00 2001
From: sheenachhabra <sheenachhabra@google.com>
Date: Mon, 22 Jan 2024 07:42:26 -0800
Subject: [PATCH] Do not write empty track (with no samples) in a non
 fragmented MP4

PiperOrigin-RevId: 600453680
---
 .../src/main/java/androidx/media3/muxer/Mp4MoovStructure.java  | 3 +++
 1 file changed, 3 insertions(+)

diff --git a/libraries/muxer/src/main/java/androidx/media3/muxer/Mp4MoovStructure.java b/libraries/muxer/src/main/java/androidx/media3/muxer/Mp4MoovStructure.java
index 88ad25e5f1..978a62600c 100644
--- a/libraries/muxer/src/main/java/androidx/media3/muxer/Mp4MoovStructure.java
+++ b/libraries/muxer/src/main/java/androidx/media3/muxer/Mp4MoovStructure.java
@@ -67,6 +67,9 @@ import org.checkerframework.checker.nullness.qual.PolyNull;
     long videoDurationUs = 0L;
     for (int i = 0; i < tracks.size(); i++) {
       TrackMetadataProvider track = tracks.get(i);
+      if (!isFragmentedMp4 && track.writtenSamples().isEmpty()) {
+        continue;
+      }
       Format format = track.format();
       String languageCode = bcp47LanguageTagToIso3(format.language);