diff --git a/Jellyfin.Api/Controllers/AudioController.cs b/Jellyfin.Api/Controllers/AudioController.cs
index 616fe5b91f..8b1813b200 100644
--- a/Jellyfin.Api/Controllers/AudioController.cs
+++ b/Jellyfin.Api/Controllers/AudioController.cs
@@ -122,7 +122,7 @@ namespace Jellyfin.Api.Controllers
             [FromQuery] int? height,
             [FromQuery] int? videoBitRate,
             [FromQuery] int? subtitleStreamIndex,
-            [FromQuery] SubtitleDeliveryMethod subtitleMethod,
+            [FromQuery] SubtitleDeliveryMethod? subtitleMethod,
             [FromQuery] int? maxRefFrames,
             [FromQuery] int? maxVideoBitDepth,
             [FromQuery] bool? requireAvc,
@@ -174,7 +174,7 @@ namespace Jellyfin.Api.Controllers
                 Height = height,
                 VideoBitRate = videoBitRate,
                 SubtitleStreamIndex = subtitleStreamIndex,
-                SubtitleMethod = subtitleMethod,
+                SubtitleMethod = subtitleMethod ?? SubtitleDeliveryMethod.Encode,
                 MaxRefFrames = maxRefFrames,
                 MaxVideoBitDepth = maxVideoBitDepth,
                 RequireAvc = requireAvc ?? true,
@@ -287,7 +287,7 @@ namespace Jellyfin.Api.Controllers
             [FromQuery] int? height,
             [FromQuery] int? videoBitRate,
             [FromQuery] int? subtitleStreamIndex,
-            [FromQuery] SubtitleDeliveryMethod subtitleMethod,
+            [FromQuery] SubtitleDeliveryMethod? subtitleMethod,
             [FromQuery] int? maxRefFrames,
             [FromQuery] int? maxVideoBitDepth,
             [FromQuery] bool? requireAvc,
@@ -339,7 +339,7 @@ namespace Jellyfin.Api.Controllers
                 Height = height,
                 VideoBitRate = videoBitRate,
                 SubtitleStreamIndex = subtitleStreamIndex,
-                SubtitleMethod = subtitleMethod,
+                SubtitleMethod = subtitleMethod ?? SubtitleDeliveryMethod.Encode,
                 MaxRefFrames = maxRefFrames,
                 MaxVideoBitDepth = maxVideoBitDepth,
                 RequireAvc = requireAvc ?? true,
diff --git a/Jellyfin.Api/Controllers/DynamicHlsController.cs b/Jellyfin.Api/Controllers/DynamicHlsController.cs
index 6e85737d26..52f01ffa8e 100644
--- a/Jellyfin.Api/Controllers/DynamicHlsController.cs
+++ b/Jellyfin.Api/Controllers/DynamicHlsController.cs
@@ -204,7 +204,7 @@ namespace Jellyfin.Api.Controllers
             [FromQuery] int? height,
             [FromQuery] int? videoBitRate,
             [FromQuery] int? subtitleStreamIndex,
-            [FromQuery] SubtitleDeliveryMethod subtitleMethod,
+            [FromQuery] SubtitleDeliveryMethod? subtitleMethod,
             [FromQuery] int? maxRefFrames,
             [FromQuery] int? maxVideoBitDepth,
             [FromQuery] bool? requireAvc,
@@ -219,7 +219,7 @@ namespace Jellyfin.Api.Controllers
             [FromQuery] string? transcodeReasons,
             [FromQuery] int? audioStreamIndex,
             [FromQuery] int? videoStreamIndex,
-            [FromQuery] EncodingContext context,
+            [FromQuery] EncodingContext? context,
             [FromQuery] Dictionary<string, string> streamOptions,
             [FromQuery] bool enableAdaptiveBitrateStreaming = true)
         {
@@ -256,7 +256,7 @@ namespace Jellyfin.Api.Controllers
                 Height = height,
                 VideoBitRate = videoBitRate,
                 SubtitleStreamIndex = subtitleStreamIndex,
-                SubtitleMethod = subtitleMethod,
+                SubtitleMethod = subtitleMethod ?? SubtitleDeliveryMethod.Encode,
                 MaxRefFrames = maxRefFrames,
                 MaxVideoBitDepth = maxVideoBitDepth,
                 RequireAvc = requireAvc ?? true,
@@ -271,7 +271,7 @@ namespace Jellyfin.Api.Controllers
                 TranscodeReasons = transcodeReasons,
                 AudioStreamIndex = audioStreamIndex,
                 VideoStreamIndex = videoStreamIndex,
-                Context = context,
+                Context = context ?? EncodingContext.Streaming,
                 StreamOptions = streamOptions,
                 EnableAdaptiveBitrateStreaming = enableAdaptiveBitrateStreaming
             };
@@ -371,7 +371,7 @@ namespace Jellyfin.Api.Controllers
             [FromQuery] int? height,
             [FromQuery] int? videoBitRate,
             [FromQuery] int? subtitleStreamIndex,
-            [FromQuery] SubtitleDeliveryMethod subtitleMethod,
+            [FromQuery] SubtitleDeliveryMethod? subtitleMethod,
             [FromQuery] int? maxRefFrames,
             [FromQuery] int? maxVideoBitDepth,
             [FromQuery] bool? requireAvc,
@@ -386,7 +386,7 @@ namespace Jellyfin.Api.Controllers
             [FromQuery] string? transcodeReasons,
             [FromQuery] int? audioStreamIndex,
             [FromQuery] int? videoStreamIndex,
-            [FromQuery] EncodingContext context,
+            [FromQuery] EncodingContext? context,
             [FromQuery] Dictionary<string, string> streamOptions,
             [FromQuery] bool enableAdaptiveBitrateStreaming = true)
         {
@@ -423,7 +423,7 @@ namespace Jellyfin.Api.Controllers
                 Height = height,
                 VideoBitRate = videoBitRate,
                 SubtitleStreamIndex = subtitleStreamIndex,
-                SubtitleMethod = subtitleMethod,
+                SubtitleMethod = subtitleMethod ?? SubtitleDeliveryMethod.Encode,
                 MaxRefFrames = maxRefFrames,
                 MaxVideoBitDepth = maxVideoBitDepth,
                 RequireAvc = requireAvc ?? true,
@@ -438,7 +438,7 @@ namespace Jellyfin.Api.Controllers
                 TranscodeReasons = transcodeReasons,
                 AudioStreamIndex = audioStreamIndex,
                 VideoStreamIndex = videoStreamIndex,
-                Context = context,
+                Context = context ?? EncodingContext.Streaming,
                 StreamOptions = streamOptions,
                 EnableAdaptiveBitrateStreaming = enableAdaptiveBitrateStreaming
             };
@@ -534,7 +534,7 @@ namespace Jellyfin.Api.Controllers
             [FromQuery] int? height,
             [FromQuery] int? videoBitRate,
             [FromQuery] int? subtitleStreamIndex,
-            [FromQuery] SubtitleDeliveryMethod subtitleMethod,
+            [FromQuery] SubtitleDeliveryMethod? subtitleMethod,
             [FromQuery] int? maxRefFrames,
             [FromQuery] int? maxVideoBitDepth,
             [FromQuery] bool? requireAvc,
@@ -549,7 +549,7 @@ namespace Jellyfin.Api.Controllers
             [FromQuery] string? transcodeReasons,
             [FromQuery] int? audioStreamIndex,
             [FromQuery] int? videoStreamIndex,
-            [FromQuery] EncodingContext context,
+            [FromQuery] EncodingContext? context,
             [FromQuery] Dictionary<string, string> streamOptions)
         {
             var cancellationTokenSource = new CancellationTokenSource();
@@ -586,7 +586,7 @@ namespace Jellyfin.Api.Controllers
                 Height = height,
                 VideoBitRate = videoBitRate,
                 SubtitleStreamIndex = subtitleStreamIndex,
-                SubtitleMethod = subtitleMethod,
+                SubtitleMethod = subtitleMethod ?? SubtitleDeliveryMethod.Encode,
                 MaxRefFrames = maxRefFrames,
                 MaxVideoBitDepth = maxVideoBitDepth,
                 RequireAvc = requireAvc ?? true,
@@ -601,7 +601,7 @@ namespace Jellyfin.Api.Controllers
                 TranscodeReasons = transcodeReasons,
                 AudioStreamIndex = audioStreamIndex,
                 VideoStreamIndex = videoStreamIndex,
-                Context = context,
+                Context = context ?? EncodingContext.Streaming,
                 StreamOptions = streamOptions
             };
 
@@ -699,7 +699,7 @@ namespace Jellyfin.Api.Controllers
             [FromQuery] int? height,
             [FromQuery] int? videoBitRate,
             [FromQuery] int? subtitleStreamIndex,
-            [FromQuery] SubtitleDeliveryMethod subtitleMethod,
+            [FromQuery] SubtitleDeliveryMethod? subtitleMethod,
             [FromQuery] int? maxRefFrames,
             [FromQuery] int? maxVideoBitDepth,
             [FromQuery] bool? requireAvc,
@@ -714,7 +714,7 @@ namespace Jellyfin.Api.Controllers
             [FromQuery] string? transcodeReasons,
             [FromQuery] int? audioStreamIndex,
             [FromQuery] int? videoStreamIndex,
-            [FromQuery] EncodingContext context,
+            [FromQuery] EncodingContext? context,
             [FromQuery] Dictionary<string, string> streamOptions)
         {
             var cancellationTokenSource = new CancellationTokenSource();
@@ -751,7 +751,7 @@ namespace Jellyfin.Api.Controllers
                 Height = height,
                 VideoBitRate = videoBitRate,
                 SubtitleStreamIndex = subtitleStreamIndex,
-                SubtitleMethod = subtitleMethod,
+                SubtitleMethod = subtitleMethod ?? SubtitleDeliveryMethod.Encode,
                 MaxRefFrames = maxRefFrames,
                 MaxVideoBitDepth = maxVideoBitDepth,
                 RequireAvc = requireAvc ?? true,
@@ -766,7 +766,7 @@ namespace Jellyfin.Api.Controllers
                 TranscodeReasons = transcodeReasons,
                 AudioStreamIndex = audioStreamIndex,
                 VideoStreamIndex = videoStreamIndex,
-                Context = context,
+                Context = context ?? EncodingContext.Streaming,
                 StreamOptions = streamOptions
             };
 
@@ -869,7 +869,7 @@ namespace Jellyfin.Api.Controllers
             [FromQuery] int? height,
             [FromQuery] int? videoBitRate,
             [FromQuery] int? subtitleStreamIndex,
-            [FromQuery] SubtitleDeliveryMethod subtitleMethod,
+            [FromQuery] SubtitleDeliveryMethod? subtitleMethod,
             [FromQuery] int? maxRefFrames,
             [FromQuery] int? maxVideoBitDepth,
             [FromQuery] bool? requireAvc,
@@ -884,7 +884,7 @@ namespace Jellyfin.Api.Controllers
             [FromQuery] string? transcodeReasons,
             [FromQuery] int? audioStreamIndex,
             [FromQuery] int? videoStreamIndex,
-            [FromQuery] EncodingContext context,
+            [FromQuery] EncodingContext? context,
             [FromQuery] Dictionary<string, string> streamOptions)
         {
             var streamingRequest = new VideoRequestDto
@@ -921,7 +921,7 @@ namespace Jellyfin.Api.Controllers
                 Height = height,
                 VideoBitRate = videoBitRate,
                 SubtitleStreamIndex = subtitleStreamIndex,
-                SubtitleMethod = subtitleMethod,
+                SubtitleMethod = subtitleMethod ?? SubtitleDeliveryMethod.Encode,
                 MaxRefFrames = maxRefFrames,
                 MaxVideoBitDepth = maxVideoBitDepth,
                 RequireAvc = requireAvc ?? true,
@@ -936,7 +936,7 @@ namespace Jellyfin.Api.Controllers
                 TranscodeReasons = transcodeReasons,
                 AudioStreamIndex = audioStreamIndex,
                 VideoStreamIndex = videoStreamIndex,
-                Context = context,
+                Context = context ?? EncodingContext.Streaming,
                 StreamOptions = streamOptions
             };
 
@@ -1041,7 +1041,7 @@ namespace Jellyfin.Api.Controllers
             [FromQuery] int? height,
             [FromQuery] int? videoBitRate,
             [FromQuery] int? subtitleStreamIndex,
-            [FromQuery] SubtitleDeliveryMethod subtitleMethod,
+            [FromQuery] SubtitleDeliveryMethod? subtitleMethod,
             [FromQuery] int? maxRefFrames,
             [FromQuery] int? maxVideoBitDepth,
             [FromQuery] bool? requireAvc,
@@ -1056,7 +1056,7 @@ namespace Jellyfin.Api.Controllers
             [FromQuery] string? transcodeReasons,
             [FromQuery] int? audioStreamIndex,
             [FromQuery] int? videoStreamIndex,
-            [FromQuery] EncodingContext context,
+            [FromQuery] EncodingContext? context,
             [FromQuery] Dictionary<string, string> streamOptions)
         {
             var streamingRequest = new StreamingRequestDto
@@ -1093,7 +1093,7 @@ namespace Jellyfin.Api.Controllers
                 Height = height,
                 VideoBitRate = videoBitRate,
                 SubtitleStreamIndex = subtitleStreamIndex,
-                SubtitleMethod = subtitleMethod,
+                SubtitleMethod = subtitleMethod ?? SubtitleDeliveryMethod.Encode,
                 MaxRefFrames = maxRefFrames,
                 MaxVideoBitDepth = maxVideoBitDepth,
                 RequireAvc = requireAvc ?? true,
@@ -1108,7 +1108,7 @@ namespace Jellyfin.Api.Controllers
                 TranscodeReasons = transcodeReasons,
                 AudioStreamIndex = audioStreamIndex,
                 VideoStreamIndex = videoStreamIndex,
-                Context = context,
+                Context = context ?? EncodingContext.Streaming,
                 StreamOptions = streamOptions
             };
 
diff --git a/Jellyfin.Api/Controllers/HlsSegmentController.cs b/Jellyfin.Api/Controllers/HlsSegmentController.cs
index f519877326..9ef9697384 100644
--- a/Jellyfin.Api/Controllers/HlsSegmentController.cs
+++ b/Jellyfin.Api/Controllers/HlsSegmentController.cs
@@ -98,7 +98,9 @@ namespace Jellyfin.Api.Controllers
         [HttpDelete("Videos/ActiveEncodings")]
         [Authorize(Policy = Policies.DefaultAuthorization)]
         [ProducesResponseType(StatusCodes.Status204NoContent)]
-        public ActionResult StopEncodingProcess([FromQuery] string deviceId, [FromQuery] string playSessionId)
+        public ActionResult StopEncodingProcess(
+            [FromQuery, Required] string deviceId,
+            [FromQuery, Required] string playSessionId)
         {
             _transcodingJobHelper.KillTranscodingJobs(deviceId, playSessionId, path => true);
             return NoContent();
diff --git a/Jellyfin.Api/Controllers/ImageController.cs b/Jellyfin.Api/Controllers/ImageController.cs
index dc36349704..c1dd6a1e02 100644
--- a/Jellyfin.Api/Controllers/ImageController.cs
+++ b/Jellyfin.Api/Controllers/ImageController.cs
@@ -392,7 +392,7 @@ namespace Jellyfin.Api.Controllers
             [FromRoute, Required] Guid itemId,
             [FromRoute, Required] ImageType imageType,
             [FromRoute, Required] int imageIndex,
-            [FromQuery] int newIndex)
+            [FromQuery, Required] int newIndex)
         {
             var item = _libraryManager.GetItemById(itemId);
             if (item == null)
@@ -741,7 +741,7 @@ namespace Jellyfin.Api.Controllers
         public async Task<ActionResult> GetArtistImage(
             [FromRoute, Required] string name,
             [FromRoute, Required] ImageType imageType,
-            [FromQuery] string tag,
+            [FromQuery] string? tag,
             [FromQuery] ImageFormat? format,
             [FromQuery] int? maxWidth,
             [FromQuery] int? maxHeight,
@@ -820,7 +820,7 @@ namespace Jellyfin.Api.Controllers
         public async Task<ActionResult> GetGenreImage(
             [FromRoute, Required] string name,
             [FromRoute, Required] ImageType imageType,
-            [FromQuery] string tag,
+            [FromQuery] string? tag,
             [FromQuery] ImageFormat? format,
             [FromQuery] int? maxWidth,
             [FromQuery] int? maxHeight,
@@ -900,7 +900,7 @@ namespace Jellyfin.Api.Controllers
             [FromRoute, Required] string name,
             [FromRoute, Required] ImageType imageType,
             [FromRoute, Required] int imageIndex,
-            [FromQuery] string tag,
+            [FromQuery] string? tag,
             [FromQuery] ImageFormat? format,
             [FromQuery] int? maxWidth,
             [FromQuery] int? maxHeight,
@@ -978,7 +978,7 @@ namespace Jellyfin.Api.Controllers
         public async Task<ActionResult> GetMusicGenreImage(
             [FromRoute, Required] string name,
             [FromRoute, Required] ImageType imageType,
-            [FromQuery] string tag,
+            [FromQuery] string? tag,
             [FromQuery] ImageFormat? format,
             [FromQuery] int? maxWidth,
             [FromQuery] int? maxHeight,
@@ -1058,7 +1058,7 @@ namespace Jellyfin.Api.Controllers
             [FromRoute, Required] string name,
             [FromRoute, Required] ImageType imageType,
             [FromRoute, Required] int imageIndex,
-            [FromQuery] string tag,
+            [FromQuery] string? tag,
             [FromQuery] ImageFormat? format,
             [FromQuery] int? maxWidth,
             [FromQuery] int? maxHeight,
@@ -1136,7 +1136,7 @@ namespace Jellyfin.Api.Controllers
         public async Task<ActionResult> GetPersonImage(
             [FromRoute, Required] string name,
             [FromRoute, Required] ImageType imageType,
-            [FromQuery] string tag,
+            [FromQuery] string? tag,
             [FromQuery] ImageFormat? format,
             [FromQuery] int? maxWidth,
             [FromQuery] int? maxHeight,
@@ -1216,7 +1216,7 @@ namespace Jellyfin.Api.Controllers
             [FromRoute, Required] string name,
             [FromRoute, Required] ImageType imageType,
             [FromRoute, Required] int imageIndex,
-            [FromQuery] string tag,
+            [FromQuery] string? tag,
             [FromQuery] ImageFormat? format,
             [FromQuery] int? maxWidth,
             [FromQuery] int? maxHeight,
diff --git a/Jellyfin.Api/Controllers/ItemUpdateController.cs b/Jellyfin.Api/Controllers/ItemUpdateController.cs
index 9e1a398538..a9f4a5a58c 100644
--- a/Jellyfin.Api/Controllers/ItemUpdateController.cs
+++ b/Jellyfin.Api/Controllers/ItemUpdateController.cs
@@ -195,7 +195,7 @@ namespace Jellyfin.Api.Controllers
         [HttpPost("Items/{itemId}/ContentType")]
         [ProducesResponseType(StatusCodes.Status204NoContent)]
         [ProducesResponseType(StatusCodes.Status404NotFound)]
-        public ActionResult UpdateItemContentType([FromRoute, Required] Guid itemId, [FromQuery] string contentType)
+        public ActionResult UpdateItemContentType([FromRoute, Required] Guid itemId, [FromQuery] string? contentType)
         {
             var item = _libraryManager.GetItemById(itemId);
             if (item == null)
diff --git a/Jellyfin.Api/Controllers/LibraryController.cs b/Jellyfin.Api/Controllers/LibraryController.cs
index 28d359ac3a..415dc0ed72 100644
--- a/Jellyfin.Api/Controllers/LibraryController.cs
+++ b/Jellyfin.Api/Controllers/LibraryController.cs
@@ -778,7 +778,7 @@ namespace Jellyfin.Api.Controllers
         [ProducesResponseType(StatusCodes.Status200OK)]
         public ActionResult<LibraryOptionsResultDto> GetLibraryOptionsInfo(
             [FromQuery] string? libraryContentType,
-            [FromQuery] bool isNewLibrary)
+            [FromQuery] bool isNewLibrary = false)
         {
             var result = new LibraryOptionsResultDto();
 
diff --git a/Jellyfin.Api/Controllers/PlaystateController.cs b/Jellyfin.Api/Controllers/PlaystateController.cs
index ec7b84ff60..f256c8c25c 100644
--- a/Jellyfin.Api/Controllers/PlaystateController.cs
+++ b/Jellyfin.Api/Controllers/PlaystateController.cs
@@ -152,7 +152,7 @@ namespace Jellyfin.Api.Controllers
         /// <returns>A <see cref="NoContentResult"/>.</returns>
         [HttpPost("Sessions/Playing/Ping")]
         [ProducesResponseType(StatusCodes.Status204NoContent)]
-        public ActionResult PingPlaybackSession([FromQuery] string playSessionId)
+        public ActionResult PingPlaybackSession([FromQuery, Required] string playSessionId)
         {
             _transcodingJobHelper.PingTranscodingJob(playSessionId, null);
             return NoContent();
@@ -202,9 +202,9 @@ namespace Jellyfin.Api.Controllers
             [FromQuery] string? mediaSourceId,
             [FromQuery] int? audioStreamIndex,
             [FromQuery] int? subtitleStreamIndex,
-            [FromQuery] PlayMethod playMethod,
+            [FromQuery] PlayMethod? playMethod,
             [FromQuery] string? liveStreamId,
-            [FromQuery] string playSessionId,
+            [FromQuery] string? playSessionId,
             [FromQuery] bool canSeek = false)
         {
             var playbackStartInfo = new PlaybackStartInfo
@@ -214,7 +214,7 @@ namespace Jellyfin.Api.Controllers
                 MediaSourceId = mediaSourceId,
                 AudioStreamIndex = audioStreamIndex,
                 SubtitleStreamIndex = subtitleStreamIndex,
-                PlayMethod = playMethod,
+                PlayMethod = playMethod ?? PlayMethod.Transcode,
                 PlaySessionId = playSessionId,
                 LiveStreamId = liveStreamId
             };
@@ -254,10 +254,10 @@ namespace Jellyfin.Api.Controllers
             [FromQuery] int? audioStreamIndex,
             [FromQuery] int? subtitleStreamIndex,
             [FromQuery] int? volumeLevel,
-            [FromQuery] PlayMethod playMethod,
+            [FromQuery] PlayMethod? playMethod,
             [FromQuery] string? liveStreamId,
-            [FromQuery] string playSessionId,
-            [FromQuery] RepeatMode repeatMode,
+            [FromQuery] string? playSessionId,
+            [FromQuery] RepeatMode? repeatMode,
             [FromQuery] bool isPaused = false,
             [FromQuery] bool isMuted = false)
         {
@@ -271,10 +271,10 @@ namespace Jellyfin.Api.Controllers
                 AudioStreamIndex = audioStreamIndex,
                 SubtitleStreamIndex = subtitleStreamIndex,
                 VolumeLevel = volumeLevel,
-                PlayMethod = playMethod,
+                PlayMethod = playMethod ?? PlayMethod.Transcode,
                 PlaySessionId = playSessionId,
                 LiveStreamId = liveStreamId,
-                RepeatMode = repeatMode
+                RepeatMode = repeatMode ?? RepeatMode.RepeatNone
             };
 
             playbackProgressInfo.PlayMethod = ValidatePlayMethod(playbackProgressInfo.PlayMethod, playbackProgressInfo.PlaySessionId);
@@ -352,7 +352,7 @@ namespace Jellyfin.Api.Controllers
             return _userDataRepository.GetUserDataDto(item, user);
         }
 
-        private PlayMethod ValidatePlayMethod(PlayMethod method, string playSessionId)
+        private PlayMethod ValidatePlayMethod(PlayMethod method, string? playSessionId)
         {
             if (method == PlayMethod.Transcode)
             {
diff --git a/Jellyfin.Api/Controllers/UniversalAudioController.cs b/Jellyfin.Api/Controllers/UniversalAudioController.cs
index 34c9f32fa4..c873ad3b67 100644
--- a/Jellyfin.Api/Controllers/UniversalAudioController.cs
+++ b/Jellyfin.Api/Controllers/UniversalAudioController.cs
@@ -112,7 +112,7 @@ namespace Jellyfin.Api.Controllers
             [FromQuery] int? maxAudioSampleRate,
             [FromQuery] int? maxAudioBitDepth,
             [FromQuery] bool? enableRemoteMedia,
-            [FromQuery] bool breakOnNonKeyFrames,
+            [FromQuery] bool breakOnNonKeyFrames = false,
             [FromQuery] bool enableRedirection = true)
         {
             var deviceProfile = GetDeviceProfile(container, transcodingContainer, audioCodec, transcodingProtocol, breakOnNonKeyFrames, transcodingAudioChannels, maxAudioSampleRate, maxAudioBitDepth, maxAudioChannels);
diff --git a/Jellyfin.Api/Controllers/VideoHlsController.cs b/Jellyfin.Api/Controllers/VideoHlsController.cs
index 7e743ee0c7..0edcd2c028 100644
--- a/Jellyfin.Api/Controllers/VideoHlsController.cs
+++ b/Jellyfin.Api/Controllers/VideoHlsController.cs
@@ -199,7 +199,7 @@ namespace Jellyfin.Api.Controllers
             [FromQuery] int? height,
             [FromQuery] int? videoBitRate,
             [FromQuery] int? subtitleStreamIndex,
-            [FromQuery] SubtitleDeliveryMethod subtitleMethod,
+            [FromQuery] SubtitleDeliveryMethod? subtitleMethod,
             [FromQuery] int? maxRefFrames,
             [FromQuery] int? maxVideoBitDepth,
             [FromQuery] bool? requireAvc,
@@ -214,7 +214,7 @@ namespace Jellyfin.Api.Controllers
             [FromQuery] string? transcodeReasons,
             [FromQuery] int? audioStreamIndex,
             [FromQuery] int? videoStreamIndex,
-            [FromQuery] EncodingContext context,
+            [FromQuery] EncodingContext? context,
             [FromQuery] Dictionary<string, string> streamOptions,
             [FromQuery] int? maxWidth,
             [FromQuery] int? maxHeight,
@@ -254,7 +254,7 @@ namespace Jellyfin.Api.Controllers
                 Height = height,
                 VideoBitRate = videoBitRate,
                 SubtitleStreamIndex = subtitleStreamIndex,
-                SubtitleMethod = subtitleMethod,
+                SubtitleMethod = subtitleMethod ?? SubtitleDeliveryMethod.Encode,
                 MaxRefFrames = maxRefFrames,
                 MaxVideoBitDepth = maxVideoBitDepth,
                 RequireAvc = requireAvc ?? true,
@@ -269,7 +269,7 @@ namespace Jellyfin.Api.Controllers
                 TranscodeReasons = transcodeReasons,
                 AudioStreamIndex = audioStreamIndex,
                 VideoStreamIndex = videoStreamIndex,
-                Context = context,
+                Context = context ?? EncodingContext.Streaming,
                 StreamOptions = streamOptions,
                 MaxHeight = maxHeight,
                 MaxWidth = maxWidth,
diff --git a/Jellyfin.Api/Controllers/VideosController.cs b/Jellyfin.Api/Controllers/VideosController.cs
index 44dc639523..8c7aa73257 100644
--- a/Jellyfin.Api/Controllers/VideosController.cs
+++ b/Jellyfin.Api/Controllers/VideosController.cs
@@ -364,7 +364,7 @@ namespace Jellyfin.Api.Controllers
             [FromQuery] int? height,
             [FromQuery] int? videoBitRate,
             [FromQuery] int? subtitleStreamIndex,
-            [FromQuery] SubtitleDeliveryMethod subtitleMethod,
+            [FromQuery] SubtitleDeliveryMethod? subtitleMethod,
             [FromQuery] int? maxRefFrames,
             [FromQuery] int? maxVideoBitDepth,
             [FromQuery] bool? requireAvc,
@@ -379,7 +379,7 @@ namespace Jellyfin.Api.Controllers
             [FromQuery] string? transcodeReasons,
             [FromQuery] int? audioStreamIndex,
             [FromQuery] int? videoStreamIndex,
-            [FromQuery] EncodingContext context,
+            [FromQuery] EncodingContext? context,
             [FromQuery] Dictionary<string, string> streamOptions)
         {
             var isHeadRequest = Request.Method == System.Net.WebRequestMethods.Http.Head;
@@ -418,7 +418,7 @@ namespace Jellyfin.Api.Controllers
                 Height = height,
                 VideoBitRate = videoBitRate,
                 SubtitleStreamIndex = subtitleStreamIndex,
-                SubtitleMethod = subtitleMethod,
+                SubtitleMethod = subtitleMethod ?? SubtitleDeliveryMethod.Encode,
                 MaxRefFrames = maxRefFrames,
                 MaxVideoBitDepth = maxVideoBitDepth,
                 RequireAvc = requireAvc ?? true,
@@ -433,7 +433,7 @@ namespace Jellyfin.Api.Controllers
                 TranscodeReasons = transcodeReasons,
                 AudioStreamIndex = audioStreamIndex,
                 VideoStreamIndex = videoStreamIndex,
-                Context = context,
+                Context = context ?? EncodingContext.Streaming,
                 StreamOptions = streamOptions
             };
 
@@ -620,7 +620,7 @@ namespace Jellyfin.Api.Controllers
             [FromQuery] int? height,
             [FromQuery] int? videoBitRate,
             [FromQuery] int? subtitleStreamIndex,
-            [FromQuery] SubtitleDeliveryMethod subtitleMethod,
+            [FromQuery] SubtitleDeliveryMethod? subtitleMethod,
             [FromQuery] int? maxRefFrames,
             [FromQuery] int? maxVideoBitDepth,
             [FromQuery] bool? requireAvc,
@@ -635,7 +635,7 @@ namespace Jellyfin.Api.Controllers
             [FromQuery] string? transcodeReasons,
             [FromQuery] int? audioStreamIndex,
             [FromQuery] int? videoStreamIndex,
-            [FromQuery] EncodingContext context,
+            [FromQuery] EncodingContext? context,
             [FromQuery] Dictionary<string, string> streamOptions)
         {
             return GetVideoStream(