diff --git a/Jellyfin.Api/Controllers/VideosController.cs b/Jellyfin.Api/Controllers/VideosController.cs
new file mode 100644
index 0000000000..532ce59c50
--- /dev/null
+++ b/Jellyfin.Api/Controllers/VideosController.cs
@@ -0,0 +1,202 @@
+using System;
+using System.Globalization;
+using System.Linq;
+using System.Threading;
+using Jellyfin.Api.Constants;
+using Jellyfin.Api.Extensions;
+using Jellyfin.Api.Helpers;
+using MediaBrowser.Controller.Dto;
+using MediaBrowser.Controller.Entities;
+using MediaBrowser.Controller.Library;
+using MediaBrowser.Model.Dto;
+using MediaBrowser.Model.Entities;
+using MediaBrowser.Model.Querying;
+using Microsoft.AspNetCore.Authorization;
+using Microsoft.AspNetCore.Http;
+using Microsoft.AspNetCore.Mvc;
+
+namespace Jellyfin.Api.Controllers
+{
+    /// <summary>
+    /// The videos controller.
+    /// </summary>
+    [Route("Videos")]
+    public class VideosController : BaseJellyfinApiController
+    {
+        private readonly ILibraryManager _libraryManager;
+        private readonly IUserManager _userManager;
+        private readonly IDtoService _dtoService;
+
+        /// <summary>
+        /// Initializes a new instance of the <see cref="VideosController"/> class.
+        /// </summary>
+        /// <param name="libraryManager">Instance of the <see cref="ILibraryManager"/> interface.</param>
+        /// <param name="userManager">Instance of the <see cref="IUserManager"/> interface.</param>
+        /// <param name="dtoService">Instance of the <see cref="IDtoService"/> interface.</param>
+        public VideosController(
+            ILibraryManager libraryManager,
+            IUserManager userManager,
+            IDtoService dtoService)
+        {
+            _libraryManager = libraryManager;
+            _userManager = userManager;
+            _dtoService = dtoService;
+        }
+
+        /// <summary>
+        /// Gets additional parts for a video.
+        /// </summary>
+        /// <param name="itemId">The item id.</param>
+        /// <param name="userId">Optional. Filter by user id, and attach user data.</param>
+        /// <response code="200">Additional parts returned.</response>
+        /// <returns>A <see cref="QueryResult{BaseItemDto}"/> with the parts.</returns>
+        [HttpGet("{itemId}/AdditionalParts")]
+        [Authorize]
+        [ProducesResponseType(StatusCodes.Status200OK)]
+        public ActionResult<QueryResult<BaseItemDto>> GetAdditionalPart([FromRoute] Guid itemId, [FromQuery] Guid userId)
+        {
+            var user = !userId.Equals(Guid.Empty) ? _userManager.GetUserById(userId) : null;
+
+            var item = itemId.Equals(Guid.Empty)
+                ? (!userId.Equals(Guid.Empty)
+                    ? _libraryManager.GetUserRootFolder()
+                    : _libraryManager.RootFolder)
+                : _libraryManager.GetItemById(itemId);
+
+            var dtoOptions = new DtoOptions();
+            dtoOptions = dtoOptions.AddClientFields(Request);
+
+            BaseItemDto[] items;
+            if (item is Video video)
+            {
+                items = video.GetAdditionalParts()
+                    .Select(i => _dtoService.GetBaseItemDto(i, dtoOptions, user, video))
+                    .ToArray();
+            }
+            else
+            {
+                items = Array.Empty<BaseItemDto>();
+            }
+
+            var result = new QueryResult<BaseItemDto>
+            {
+                Items = items,
+                TotalRecordCount = items.Length
+            };
+
+            return result;
+        }
+
+        /// <summary>
+        /// Removes alternate video sources.
+        /// </summary>
+        /// <param name="itemId">The item id.</param>
+        /// <response code="204">Alternate sources deleted.</response>
+        /// <response code="404">Video not found.</response>
+        /// <returns>A <see cref="NoContentResult"/> indicating success, or a <see cref="NotFoundResult"/> if the video doesn't exist.</returns>
+        [HttpDelete("{itemId}/AlternateSources")]
+        [Authorize(Policy = Policies.RequiresElevation)]
+        [ProducesResponseType(StatusCodes.Status200OK)]
+        [ProducesResponseType(StatusCodes.Status404NotFound)]
+        public ActionResult DeleteAlternateSources([FromRoute] Guid itemId)
+        {
+            var video = (Video)_libraryManager.GetItemById(itemId);
+
+            if (video == null)
+            {
+                return NotFound("The video either does not exist or the id does not belong to a video.");
+            }
+
+            foreach (var link in video.GetLinkedAlternateVersions())
+            {
+                link.SetPrimaryVersionId(null);
+                link.LinkedAlternateVersions = Array.Empty<LinkedChild>();
+
+                link.UpdateToRepository(ItemUpdateType.MetadataEdit, CancellationToken.None);
+            }
+
+            video.LinkedAlternateVersions = Array.Empty<LinkedChild>();
+            video.SetPrimaryVersionId(null);
+            video.UpdateToRepository(ItemUpdateType.MetadataEdit, CancellationToken.None);
+
+            return NoContent();
+        }
+
+        /// <summary>
+        /// Merges videos into a single record.
+        /// </summary>
+        /// <param name="itemIds">Item id list. This allows multiple, comma delimited.</param>
+        /// <response code="204">Videos merged.</response>
+        /// <response code="400">Supply at least 2 video ids.</response>
+        /// <returns>A <see cref="NoContentResult"/> indicating success, or a <see cref="BadRequestResult"/> if less than two ids were supplied.</returns>
+        [HttpPost("MergeVersions")]
+        [Authorize(Policy = Policies.RequiresElevation)]
+        [ProducesResponseType(StatusCodes.Status204NoContent)]
+        [ProducesResponseType(StatusCodes.Status400BadRequest)]
+        public ActionResult MergeVersions([FromQuery] string itemIds)
+        {
+            var items = RequestHelpers.Split(itemIds, ',', true)
+                .Select(i => _libraryManager.GetItemById(i))
+                .OfType<Video>()
+                .OrderBy(i => i.Id)
+                .ToList();
+
+            if (items.Count < 2)
+            {
+                return BadRequest("Please supply at least two videos to merge.");
+            }
+
+            var videosWithVersions = items.Where(i => i.MediaSourceCount > 1).ToList();
+
+            var primaryVersion = videosWithVersions.FirstOrDefault();
+            if (primaryVersion == null)
+            {
+                primaryVersion = items
+                    .OrderBy(i =>
+                    {
+                        if (i.Video3DFormat.HasValue || i.VideoType != VideoType.VideoFile)
+                        {
+                            return 1;
+                        }
+
+                        return 0;
+                    })
+                    .ThenByDescending(i => i.GetDefaultVideoStream()?.Width ?? 0)
+                    .First();
+            }
+
+            var list = primaryVersion.LinkedAlternateVersions.ToList();
+
+            foreach (var item in items.Where(i => i.Id != primaryVersion.Id))
+            {
+                item.SetPrimaryVersionId(primaryVersion.Id.ToString("N", CultureInfo.InvariantCulture));
+
+                item.UpdateToRepository(ItemUpdateType.MetadataEdit, CancellationToken.None);
+
+                list.Add(new LinkedChild
+                {
+                    Path = item.Path,
+                    ItemId = item.Id
+                });
+
+                foreach (var linkedItem in item.LinkedAlternateVersions)
+                {
+                    if (!list.Any(i => string.Equals(i.Path, linkedItem.Path, StringComparison.OrdinalIgnoreCase)))
+                    {
+                        list.Add(linkedItem);
+                    }
+                }
+
+                if (item.LinkedAlternateVersions.Length > 0)
+                {
+                    item.LinkedAlternateVersions = Array.Empty<LinkedChild>();
+                    item.UpdateToRepository(ItemUpdateType.MetadataEdit, CancellationToken.None);
+                }
+            }
+
+            primaryVersion.LinkedAlternateVersions = list.ToArray();
+            primaryVersion.UpdateToRepository(ItemUpdateType.MetadataEdit, CancellationToken.None);
+            return NoContent();
+        }
+    }
+}
diff --git a/MediaBrowser.Api/VideosService.cs b/MediaBrowser.Api/VideosService.cs
deleted file mode 100644
index 957a279f85..0000000000
--- a/MediaBrowser.Api/VideosService.cs
+++ /dev/null
@@ -1,193 +0,0 @@
-using System;
-using System.Globalization;
-using System.Linq;
-using System.Threading;
-using MediaBrowser.Controller.Configuration;
-using MediaBrowser.Controller.Dto;
-using MediaBrowser.Controller.Entities;
-using MediaBrowser.Controller.Library;
-using MediaBrowser.Controller.Net;
-using MediaBrowser.Model.Dto;
-using MediaBrowser.Model.Querying;
-using MediaBrowser.Model.Services;
-using Microsoft.Extensions.Logging;
-
-namespace MediaBrowser.Api
-{
-    [Route("/Videos/{Id}/AdditionalParts", "GET", Summary = "Gets additional parts for a video.")]
-    [Authenticated]
-    public class GetAdditionalParts : IReturn<QueryResult<BaseItemDto>>
-    {
-        [ApiMember(Name = "UserId", Description = "Optional. Filter by user id, and attach user data", IsRequired = false, DataType = "string", ParameterType = "query", Verb = "GET")]
-        public Guid UserId { get; set; }
-
-        /// <summary>
-        /// Gets or sets the id.
-        /// </summary>
-        /// <value>The id.</value>
-        [ApiMember(Name = "Id", Description = "Item Id", IsRequired = true, DataType = "string", ParameterType = "path", Verb = "GET")]
-        public string Id { get; set; }
-    }
-
-    [Route("/Videos/{Id}/AlternateSources", "DELETE", Summary = "Removes alternate video sources.")]
-    [Authenticated(Roles = "Admin")]
-    public class DeleteAlternateSources : IReturnVoid
-    {
-        [ApiMember(Name = "Id", Description = "Item Id", IsRequired = true, DataType = "string", ParameterType = "path", Verb = "DELETE")]
-        public string Id { get; set; }
-    }
-
-    [Route("/Videos/MergeVersions", "POST", Summary = "Merges videos into a single record")]
-    [Authenticated(Roles = "Admin")]
-    public class MergeVersions : IReturnVoid
-    {
-        [ApiMember(Name = "Ids", Description = "Item id list. This allows multiple, comma delimited.", IsRequired = false, DataType = "string", ParameterType = "query", Verb = "POST", AllowMultiple = true)]
-        public string Ids { get; set; }
-    }
-
-    public class VideosService : BaseApiService
-    {
-        private readonly ILibraryManager _libraryManager;
-        private readonly IUserManager _userManager;
-        private readonly IDtoService _dtoService;
-        private readonly IAuthorizationContext _authContext;
-
-        public VideosService(
-            ILogger<VideosService> logger,
-            IServerConfigurationManager serverConfigurationManager,
-            IHttpResultFactory httpResultFactory,
-            ILibraryManager libraryManager,
-            IUserManager userManager,
-            IDtoService dtoService,
-            IAuthorizationContext authContext)
-            : base(logger, serverConfigurationManager, httpResultFactory)
-        {
-            _libraryManager = libraryManager;
-            _userManager = userManager;
-            _dtoService = dtoService;
-            _authContext = authContext;
-        }
-
-        /// <summary>
-        /// Gets the specified request.
-        /// </summary>
-        /// <param name="request">The request.</param>
-        /// <returns>System.Object.</returns>
-        public object Get(GetAdditionalParts request)
-        {
-            var user = !request.UserId.Equals(Guid.Empty) ? _userManager.GetUserById(request.UserId) : null;
-
-            var item = string.IsNullOrEmpty(request.Id)
-                           ? (!request.UserId.Equals(Guid.Empty)
-                                  ? _libraryManager.GetUserRootFolder()
-                                  : _libraryManager.RootFolder)
-                           : _libraryManager.GetItemById(request.Id);
-
-            var dtoOptions = GetDtoOptions(_authContext, request);
-
-            BaseItemDto[] items;
-            if (item is Video video)
-            {
-                items = video.GetAdditionalParts()
-                    .Select(i => _dtoService.GetBaseItemDto(i, dtoOptions, user, video))
-                    .ToArray();
-            }
-            else
-            {
-                items = Array.Empty<BaseItemDto>();
-            }
-
-            var result = new QueryResult<BaseItemDto>
-            {
-                Items = items,
-                TotalRecordCount = items.Length
-            };
-
-            return ToOptimizedResult(result);
-        }
-
-        public void Delete(DeleteAlternateSources request)
-        {
-            var video = (Video)_libraryManager.GetItemById(request.Id);
-
-            foreach (var link in video.GetLinkedAlternateVersions())
-            {
-                link.SetPrimaryVersionId(null);
-                link.LinkedAlternateVersions = Array.Empty<LinkedChild>();
-
-                link.UpdateToRepository(ItemUpdateType.MetadataEdit, CancellationToken.None);
-            }
-
-            video.LinkedAlternateVersions = Array.Empty<LinkedChild>();
-            video.SetPrimaryVersionId(null);
-            video.UpdateToRepository(ItemUpdateType.MetadataEdit, CancellationToken.None);
-        }
-
-        public void Post(MergeVersions request)
-        {
-            var items = request.Ids.Split(',')
-                .Select(i => _libraryManager.GetItemById(i))
-                .OfType<Video>()
-                .OrderBy(i => i.Id)
-                .ToList();
-
-            if (items.Count < 2)
-            {
-                throw new ArgumentException("Please supply at least two videos to merge.");
-            }
-
-            var videosWithVersions = items.Where(i => i.MediaSourceCount > 1)
-                .ToList();
-
-            var primaryVersion = videosWithVersions.FirstOrDefault();
-            if (primaryVersion == null)
-            {
-                primaryVersion = items.OrderBy(i =>
-                    {
-                        if (i.Video3DFormat.HasValue || i.VideoType != Model.Entities.VideoType.VideoFile)
-                        {
-                            return 1;
-                        }
-
-                        return 0;
-                    })
-                    .ThenByDescending(i =>
-                    {
-                        return i.GetDefaultVideoStream()?.Width ?? 0;
-                    }).First();
-            }
-
-            var list = primaryVersion.LinkedAlternateVersions.ToList();
-
-            foreach (var item in items.Where(i => i.Id != primaryVersion.Id))
-            {
-                item.SetPrimaryVersionId(primaryVersion.Id.ToString("N", CultureInfo.InvariantCulture));
-
-                item.UpdateToRepository(ItemUpdateType.MetadataEdit, CancellationToken.None);
-
-                list.Add(new LinkedChild
-                {
-                    Path = item.Path,
-                    ItemId = item.Id
-                });
-
-                foreach (var linkedItem in item.LinkedAlternateVersions)
-                {
-                    if (!list.Any(i => string.Equals(i.Path, linkedItem.Path, StringComparison.OrdinalIgnoreCase)))
-                    {
-                        list.Add(linkedItem);
-                    }
-                }
-
-                if (item.LinkedAlternateVersions.Length > 0)
-                {
-                    item.LinkedAlternateVersions = Array.Empty<LinkedChild>();
-                    item.UpdateToRepository(ItemUpdateType.MetadataEdit, CancellationToken.None);
-                }
-            }
-
-            primaryVersion.LinkedAlternateVersions = list.ToArray();
-            primaryVersion.UpdateToRepository(ItemUpdateType.MetadataEdit, CancellationToken.None);
-        }
-    }
-}