4 files changed, 26 insertions, 8 deletions
diff --git a/Jellyfin.Api/Controllers/DynamicHlsController.cs b/Jellyfin.Api/Controllers/DynamicHlsController.cs
index 4cac8ed67..2614fe995 100644
--- a/Jellyfin.Api/Controllers/DynamicHlsController.cs
+++ b/Jellyfin.Api/Controllers/DynamicHlsController.cs
@@ -46,6 +46,7 @@ public class DynamicHlsController : BaseJellyfinApiController
 
     private readonly Version _minFFmpegFlacInMp4 = new Version(6, 0);
     private readonly Version _minFFmpegX265BframeInFmp4 = new Version(7, 0, 1);
+    private readonly Version _minFFmpegHlsSegmentOptions = new Version(5, 0);
 
     private readonly ILibraryManager _libraryManager;
     private readonly IUserManager _userManager;
@@ -1606,6 +1607,7 @@ public class DynamicHlsController : BaseJellyfinApiController
         var segmentFormat = string.Empty;
         var segmentContainer = outputExtension.TrimStart('.');
         var inputModifier = _encodingHelper.GetInputModifier(state, _encodingOptions, segmentContainer);
+        var hlsArguments = $"-hls_playlist_type {(isEventPlaylist ? "event" : "vod")} -hls_list_size 0";
 
         if (string.Equals(segmentContainer, "ts", StringComparison.OrdinalIgnoreCase))
         {
@@ -1621,6 +1623,11 @@ public class DynamicHlsController : BaseJellyfinApiController
                 false => " -hls_fmp4_init_filename \"" + outputFileNameWithoutExtension + "-1" + outputExtension + "\""
             };
 
+            var useLegacySegmentOption = _mediaEncoder.EncoderVersion < _minFFmpegHlsSegmentOptions;
+
+            // fMP4 needs this flag to write the audio packet DTS/PTS including the initial delay into MOOF::TRAF::TFDT
+            hlsArguments += $" {(useLegacySegmentOption ? "-hls_ts_options" : "-hls_segment_options")} movflags=+frag_discont";
+
             segmentFormat = "fmp4" + outputFmp4HeaderArg;
         }
         else
@@ -1642,8 +1649,6 @@ public class DynamicHlsController : BaseJellyfinApiController
                 Path.GetFileNameWithoutExtension(outputPath));
         }
 
-        var hlsArguments = $"-hls_playlist_type {(isEventPlaylist ? "event" : "vod")} -hls_list_size 0";
-
         return string.Format(
             CultureInfo.InvariantCulture,
             "{0} {1} -map_metadata -1 -map_chapters -1 -threads {2} {3} {4} {5} -copyts -avoid_negative_ts disabled -max_muxing_queue_size {6} -f hls -max_delay 5000000 -hls_time {7} -hls_segment_type {8} -start_number {9}{10} -hls_segment_filename \"{11}\" {12} -y \"{13}\"",
diff --git a/Jellyfin.Api/Controllers/ItemUpdateController.cs b/Jellyfin.Api/Controllers/ItemUpdateController.cs
index 50eeaeac6..e1d9b6bba 100644
--- a/Jellyfin.Api/Controllers/ItemUpdateController.cs
+++ b/Jellyfin.Api/Controllers/ItemUpdateController.cs
@@ -158,7 +158,10 @@ public class ItemUpdateController : BaseJellyfinApiController
             ParentalRatingOptions = _localizationManager.GetParentalRatings().ToList(),
             ExternalIdInfos = _providerManager.GetExternalIdInfos(item).ToArray(),
             Countries = _localizationManager.GetCountries().ToArray(),
-            Cultures = _localizationManager.GetCultures().ToArray()
+            Cultures = _localizationManager.GetCultures()
+                .DistinctBy(c => c.DisplayName, StringComparer.OrdinalIgnoreCase)
+                .OrderBy(c => c.DisplayName)
+                .ToArray()
         };
 
         if (!item.IsVirtualItem
diff --git a/Jellyfin.Api/Controllers/LocalizationController.cs b/Jellyfin.Api/Controllers/LocalizationController.cs
index bbce5a9e1..dd8f935dc 100644
--- a/Jellyfin.Api/Controllers/LocalizationController.cs
+++ b/Jellyfin.Api/Controllers/LocalizationController.cs
@@ -1,4 +1,6 @@
+using System;
 using System.Collections.Generic;
+using System.Linq;
 using MediaBrowser.Common.Api;
 using MediaBrowser.Model.Entities;
 using MediaBrowser.Model.Globalization;
@@ -34,7 +36,14 @@ public class LocalizationController : BaseJellyfinApiController
     [ProducesResponseType(StatusCodes.Status200OK)]
     public ActionResult<IEnumerable<CultureDto>> GetCultures()
     {
-        return Ok(_localization.GetCultures());
+        var allCultures = _localization.GetCultures();
+
+        var distinctCultures = allCultures
+            .DistinctBy(c => c.DisplayName, StringComparer.OrdinalIgnoreCase)
+            .OrderBy(c => c.DisplayName)
+            .AsEnumerable();
+
+        return Ok(distinctCultures);
     }
 
     /// <summary>
diff --git a/Jellyfin.Api/Controllers/StartupController.cs b/Jellyfin.Api/Controllers/StartupController.cs
index 09f20558f..3bb68553d 100644
--- a/Jellyfin.Api/Controllers/StartupController.cs
+++ b/Jellyfin.Api/Controllers/StartupController.cs
@@ -1,3 +1,4 @@
+using System;
 using System.ComponentModel.DataAnnotations;
 using System.Linq;
 using System.Threading.Tasks;
@@ -131,16 +132,16 @@ public class StartupController : BaseJellyfinApiController
     [ProducesResponseType(StatusCodes.Status204NoContent)]
     public async Task<ActionResult> UpdateStartupUser([FromBody] StartupUserDto startupUserDto)
     {
+        ArgumentNullException.ThrowIfNull(startupUserDto.Name);
+        _userManager.ThrowIfInvalidUsername(startupUserDto.Name);
+
         var user = _userManager.Users.First();
         if (string.IsNullOrWhiteSpace(startupUserDto.Password))
         {
             return BadRequest("Password must not be empty");
         }
 
-        if (startupUserDto.Name is not null)
-        {
-            user.Username = startupUserDto.Name;
-        }
+        user.Username = startupUserDto.Name;
 
         await _userManager.UpdateUserAsync(user).ConfigureAwait(false);