Extract the MediaEncoder probing command arguments builder

MediaBrowser.MediaEncoding/Encoder/MediaEncoder.cs

@@ -418,10 +418,24 @@ namespace MediaBrowser.MediaEncoding.Encoder
         public Task<MediaInfo> GetMediaInfo(MediaInfoRequest request, CancellationToken cancellationToken)
         {
             var extractChapters = request.MediaType == DlnaProfileType.Video && request.ExtractChapters;
-            var requiredHeaders = request.MediaSource.RequiredHttpHeaders;
-            var analyzeDuration = string.Empty;
+            var extraArgs = GetExtraArguments(request);
+
+            return GetMediaInfoInternal(
+                GetInputArgument(request.MediaSource.Path, request.MediaSource),
+                request.MediaSource.Path,
+                request.MediaSource.Protocol,
+                extractChapters,
+                extraArgs,
+                request.MediaType == DlnaProfileType.Audio,
+                request.MediaSource.VideoType,
+                cancellationToken);
+        }
+
+        internal string GetExtraArguments(MediaInfoRequest request)
+        {
             var ffmpegAnalyzeDuration = _config.GetFFmpegAnalyzeDuration() ?? string.Empty;
             var ffmpegProbeSize = _config.GetFFmpegProbeSize() ?? string.Empty;
+            var analyzeDuration = string.Empty;
             var extraArgs = string.Empty;
 
             if (request.MediaSource.AnalyzeDurationMs > 0)
@@ -443,20 +457,12 @@ namespace MediaBrowser.MediaEncoding.Encoder
                 extraArgs += " -probesize " + ffmpegProbeSize;
             }
 
-            if (requiredHeaders.ContainsKey("user_agent"))
+            if (request.MediaSource.RequiredHttpHeaders.TryGetValue("user_agent", out var userAgent))
             {
-                extraArgs += " -user_agent " + requiredHeaders["user_agent"];
+                extraArgs += " -user_agent " + userAgent;
             }
 
-            return GetMediaInfoInternal(
-                GetInputArgument(request.MediaSource.Path, request.MediaSource),
-                request.MediaSource.Path,
-                request.MediaSource.Protocol,
-                extractChapters,
-                extraArgs,
-                request.MediaType == DlnaProfileType.Audio,
-                request.MediaSource.VideoType,
-                cancellationToken);
+            return extraArgs;
         }
 
         /// <inheritdoc />

tests/Jellyfin.MediaEncoding.Tests/Probing/ProbeExternalSourcesTests.cs

@@ -1,5 +1,5 @@
+using System;
 using System.Collections.Generic;
-using System.Threading;
 using MediaBrowser.Controller.Configuration;
 using MediaBrowser.MediaEncoding.Encoder;
 using MediaBrowser.Model.Globalization;
@@ -15,7 +15,7 @@ namespace Jellyfin.MediaEncoding.Tests.Probing
     public class ProbeExternalSourcesTests
     {
         [Fact]
-        public void GetMediaInfo_Uses_UserAgent()
+        public void GetExtraArguments_Forwards_UserAgent()
         {
             var encoder = new MediaEncoder(
                 Mock.Of<ILogger<MediaEncoder>>(),
@@ -26,6 +26,7 @@ namespace Jellyfin.MediaEncoding.Tests.Probing
                 new ConfigurationBuilder().Build(),
                 Mock.Of<IServerConfigurationManager>());
 
+            var userAgent = "Mozilla/5.0 (Windows NT 10.0; Win64; x64)";
             var req = new MediaBrowser.Controller.MediaEncoding.MediaInfoRequest()
             {
                 MediaSource = new MediaBrowser.Model.Dto.MediaSourceInfo
@@ -34,14 +35,16 @@ namespace Jellyfin.MediaEncoding.Tests.Probing
                     Protocol = MediaProtocol.Http,
                     RequiredHttpHeaders = new Dictionary<string, string>()
                     {
-                        { "user_agent", "Mozilla/5.0 (Windows NT 10.0; Win64; x64) AppleWebKit/530.35 (KHTML, like Gecko) Chrome/115.0.0.0 Safari/530.35" },
+                        { "user_agent", userAgent },
                     }
                 },
                 ExtractChapters = false,
                 MediaType = MediaBrowser.Model.Dlna.DlnaProfileType.Video,
             };
 
-            encoder.GetMediaInfo(req, CancellationToken.None);
+            var extraArg = encoder.GetExtraArguments(req);
+
+            Assert.Contains(userAgent, extraArg, StringComparison.InvariantCulture);
         }
     }
 }