diff --git a/Jellyfin.Api/Controllers/DynamicHlsController.cs b/Jellyfin.Api/Controllers/DynamicHlsController.cs
index 670b41611b..7cf96dd341 100644
--- a/Jellyfin.Api/Controllers/DynamicHlsController.cs
+++ b/Jellyfin.Api/Controllers/DynamicHlsController.cs
@@ -1,4 +1,4 @@
-using System;
+using System;
 using System.Collections.Generic;
 using System.ComponentModel.DataAnnotations;
 using System.Diagnostics.CodeAnalysis;
@@ -113,7 +113,6 @@ namespace Jellyfin.Api.Controllers
         /// Gets a video hls playlist stream.
         /// </summary>
         /// <param name="itemId">The item id.</param>
-        /// <param name="container">The video container. Possible values are: ts, webm, asf, wmv, ogv, mp4, m4v, mkv, mpeg, mpg, avi, 3gp, wmv, wtv, m2ts, mov, iso, flv. </param>
         /// <param name="static">Optional. If true, the original file will be streamed statically without any encoding. Use either no url extension or the original file extension. true/false.</param>
         /// <param name="params">The streaming parameters.</param>
         /// <param name="tag">The tag.</param>
@@ -170,7 +169,6 @@ namespace Jellyfin.Api.Controllers
         [ProducesPlaylistFile]
         public async Task<ActionResult> GetMasterHlsVideoPlaylist(
             [FromRoute, Required] Guid itemId,
-            [FromRoute, Required] string container,
             [FromQuery] bool? @static,
             [FromQuery] string? @params,
             [FromQuery] string? tag,
@@ -223,7 +221,6 @@ namespace Jellyfin.Api.Controllers
             var streamingRequest = new HlsVideoRequestDto
             {
                 Id = itemId,
-                Container = container,
                 Static = @static ?? true,
                 Params = @params,
                 Tag = tag,
@@ -281,7 +278,6 @@ namespace Jellyfin.Api.Controllers
         /// Gets an audio hls playlist stream.
         /// </summary>
         /// <param name="itemId">The item id.</param>
-        /// <param name="container">The video container. Possible values are: ts, webm, asf, wmv, ogv, mp4, m4v, mkv, mpeg, mpg, avi, 3gp, wmv, wtv, m2ts, mov, iso, flv. </param>
         /// <param name="static">Optional. If true, the original file will be streamed statically without any encoding. Use either no url extension or the original file extension. true/false.</param>
         /// <param name="params">The streaming parameters.</param>
         /// <param name="tag">The tag.</param>
@@ -338,7 +334,6 @@ namespace Jellyfin.Api.Controllers
         [ProducesPlaylistFile]
         public async Task<ActionResult> GetMasterHlsAudioPlaylist(
             [FromRoute, Required] Guid itemId,
-            [FromQuery, Required] string container,
             [FromQuery] bool? @static,
             [FromQuery] string? @params,
             [FromQuery] string? tag,
@@ -391,7 +386,6 @@ namespace Jellyfin.Api.Controllers
             var streamingRequest = new HlsAudioRequestDto
             {
                 Id = itemId,
-                Container = container,
                 Static = @static ?? true,
                 Params = @params,
                 Tag = tag,
@@ -449,7 +443,6 @@ namespace Jellyfin.Api.Controllers
         /// Gets a video stream using HTTP live streaming.
         /// </summary>
         /// <param name="itemId">The item id.</param>
-        /// <param name="container">The video container. Possible values are: ts, webm, asf, wmv, ogv, mp4, m4v, mkv, mpeg, mpg, avi, 3gp, wmv, wtv, m2ts, mov, iso, flv. </param>
         /// <param name="static">Optional. If true, the original file will be streamed statically without any encoding. Use either no url extension or the original file extension. true/false.</param>
         /// <param name="params">The streaming parameters.</param>
         /// <param name="tag">The tag.</param>
@@ -504,7 +497,6 @@ namespace Jellyfin.Api.Controllers
         [ProducesPlaylistFile]
         public async Task<ActionResult> GetVariantHlsVideoPlaylist(
             [FromRoute, Required] Guid itemId,
-            [FromQuery, Required] string container,
             [FromQuery] bool? @static,
             [FromQuery] string? @params,
             [FromQuery] string? tag,
@@ -557,7 +549,6 @@ namespace Jellyfin.Api.Controllers
             var streamingRequest = new VideoRequestDto
             {
                 Id = itemId,
-                Container = container,
                 Static = @static ?? true,
                 Params = @params,
                 Tag = tag,
@@ -615,7 +606,6 @@ namespace Jellyfin.Api.Controllers
         /// Gets an audio stream using HTTP live streaming.
         /// </summary>
         /// <param name="itemId">The item id.</param>
-        /// <param name="container">The video container. Possible values are: ts, webm, asf, wmv, ogv, mp4, m4v, mkv, mpeg, mpg, avi, 3gp, wmv, wtv, m2ts, mov, iso, flv. </param>
         /// <param name="static">Optional. If true, the original file will be streamed statically without any encoding. Use either no url extension or the original file extension. true/false.</param>
         /// <param name="params">The streaming parameters.</param>
         /// <param name="tag">The tag.</param>
@@ -670,7 +660,6 @@ namespace Jellyfin.Api.Controllers
         [ProducesPlaylistFile]
         public async Task<ActionResult> GetVariantHlsAudioPlaylist(
             [FromRoute, Required] Guid itemId,
-            [FromQuery, Required] string container,
             [FromQuery] bool? @static,
             [FromQuery] string? @params,
             [FromQuery] string? tag,
@@ -723,7 +712,6 @@ namespace Jellyfin.Api.Controllers
             var streamingRequest = new StreamingRequestDto
             {
                 Id = itemId,
-                Container = container,
                 Static = @static ?? true,
                 Params = @params,
                 Tag = tag,
@@ -841,7 +829,7 @@ namespace Jellyfin.Api.Controllers
             [FromRoute, Required] Guid itemId,
             [FromRoute, Required] string playlistId,
             [FromRoute, Required] int segmentId,
-            [FromRoute, Required] string container,
+            [FromRoute] string container,
             [FromQuery] bool? @static,
             [FromQuery] string? @params,
             [FromQuery] string? tag,
@@ -1011,7 +999,7 @@ namespace Jellyfin.Api.Controllers
             [FromRoute, Required] Guid itemId,
             [FromRoute, Required] string playlistId,
             [FromRoute, Required] int segmentId,
-            [FromRoute, Required] string container,
+            [FromRoute] string container,
             [FromQuery] bool? @static,
             [FromQuery] string? @params,
             [FromQuery] string? tag,
@@ -1465,7 +1453,7 @@ namespace Jellyfin.Api.Controllers
 
             var args = "-codec:v:0 " + codec;
 
-            // if (state.EnableMpegtsM2TsMode)
+            // if  (state.EnableMpegtsM2TsMode)
             // {
             //     args += " -mpegts_m2ts_mode 1";
             // }
diff --git a/Jellyfin.Api/Controllers/SessionController.cs b/Jellyfin.Api/Controllers/SessionController.cs
index b00675d679..a7bddc1715 100644
--- a/Jellyfin.Api/Controllers/SessionController.cs
+++ b/Jellyfin.Api/Controllers/SessionController.cs
@@ -1,5 +1,3 @@
-#pragma warning disable CA1801
-
 using System;
 using System.Collections.Generic;
 using System.ComponentModel.DataAnnotations;
@@ -150,25 +148,25 @@ namespace Jellyfin.Api.Controllers
         /// Instructs a session to play an item.
         /// </summary>
         /// <param name="sessionId">The session id.</param>
-        /// <param name="command">The type of play command to issue (PlayNow, PlayNext, PlayLast). Clients who have not yet implemented play next and play last may play now.</param>
+        /// <param name="playCommand">The type of play command to issue (PlayNow, PlayNext, PlayLast). Clients who have not yet implemented play next and play last may play now.</param>
         /// <param name="itemIds">The ids of the items to play, comma delimited.</param>
         /// <param name="startPositionTicks">The starting position of the first item.</param>
         /// <response code="204">Instruction sent to session.</response>
         /// <returns>A <see cref="NoContentResult"/>.</returns>
-        [HttpPost("Sessions/{sessionId}/Playing/{command}")]
+        [HttpPost("Sessions/{sessionId}/Playing")]
         [Authorize(Policy = Policies.DefaultAuthorization)]
         [ProducesResponseType(StatusCodes.Status204NoContent)]
         public ActionResult Play(
             [FromRoute, Required] string sessionId,
-            [FromRoute, Required] PlayCommand command,
-            [FromQuery] Guid[] itemIds,
+            [FromQuery, Required] PlayCommand playCommand,
+            [FromQuery, Required] string itemIds,
             [FromQuery] long? startPositionTicks)
         {
             var playRequest = new PlayRequest
             {
-                ItemIds = itemIds,
+                ItemIds = RequestHelpers.GetGuids(itemIds),
                 StartPositionTicks = startPositionTicks,
-                PlayCommand = command
+                PlayCommand = playCommand
             };
 
             _sessionManager.SendPlayCommand(
@@ -184,20 +182,29 @@ namespace Jellyfin.Api.Controllers
         /// Issues a playstate command to a client.
         /// </summary>
         /// <param name="sessionId">The session id.</param>
-        /// <param name="playstateRequest">The <see cref="PlaystateRequest"/>.</param>
+        /// <param name="command">The <see cref="PlaystateCommand"/>.</param>
+        /// <param name="seekPositionTicks">The optional position ticks.</param>
+        /// <param name="controllingUserId">The optional controlling user id.</param>
         /// <response code="204">Playstate command sent to session.</response>
         /// <returns>A <see cref="NoContentResult"/>.</returns>
-        [HttpPost("Sessions/{sessionId}/Playing")]
+        [HttpPost("Sessions/{sessionId}/Playing/{command}")]
         [Authorize(Policy = Policies.DefaultAuthorization)]
         [ProducesResponseType(StatusCodes.Status204NoContent)]
         public ActionResult SendPlaystateCommand(
             [FromRoute, Required] string sessionId,
-            [FromBody] PlaystateRequest playstateRequest)
+            [FromRoute, Required] PlaystateCommand command,
+            [FromQuery] long? seekPositionTicks,
+            [FromQuery] string? controllingUserId)
         {
             _sessionManager.SendPlaystateCommand(
                 RequestHelpers.GetSession(_sessionManager, _authContext, Request).Id,
                 sessionId,
-                playstateRequest,
+                new PlaystateRequest()
+                {
+                    Command = command,
+                    ControllingUserId = controllingUserId,
+                    SeekPositionTicks = seekPositionTicks,
+                },
                 CancellationToken.None);
 
             return NoContent();
@@ -434,9 +441,9 @@ namespace Jellyfin.Api.Controllers
         [ProducesResponseType(StatusCodes.Status204NoContent)]
         public ActionResult ReportViewing(
             [FromQuery] string? sessionId,
-            [FromQuery] string? itemId)
+            [FromQuery, Required] string? itemId)
         {
-            string session = RequestHelpers.GetSession(_sessionManager, _authContext, Request).Id;
+            string session = sessionId ?? RequestHelpers.GetSession(_sessionManager, _authContext, Request).Id;
 
             _sessionManager.ReportNowViewingItem(session, itemId);
             return NoContent();
diff --git a/Jellyfin.Api/Helpers/StreamingHelpers.cs b/Jellyfin.Api/Helpers/StreamingHelpers.cs
index 89ab2da627..f4ec29bdef 100644
--- a/Jellyfin.Api/Helpers/StreamingHelpers.cs
+++ b/Jellyfin.Api/Helpers/StreamingHelpers.cs
@@ -169,7 +169,7 @@ namespace Jellyfin.Api.Helpers
 
             string? containerInternal = Path.GetExtension(state.RequestedUrl);
 
-            if (string.IsNullOrEmpty(streamingRequest.Container))
+            if (!string.IsNullOrEmpty(streamingRequest.Container))
             {
                 containerInternal = streamingRequest.Container;
             }