Specify threads to ffmpeg properly

Emby.Server.Implementations/LiveTv/EmbyTV/EncodedRecorder.cs

@@ -9,6 +9,7 @@ using System.Text;
 using System.Threading;
 using System.Threading.Tasks;
 using MediaBrowser.Controller;
+using MediaBrowser.Controller.Configuration;
 using MediaBrowser.Controller.Library;
 using MediaBrowser.Controller.MediaEncoding;
 using MediaBrowser.Model.Dto;
@@ -25,6 +26,7 @@ namespace Emby.Server.Implementations.LiveTv.EmbyTV
         private readonly IServerApplicationPaths _appPaths;
         private readonly IJsonSerializer _json;
         private readonly TaskCompletionSource<bool> _taskCompletionSource = new TaskCompletionSource<bool>();
+        private readonly IServerConfigurationManager _serverConfigurationManager;
 
         private bool _hasExited;
         private Stream _logFileStream;
@@ -35,12 +37,14 @@ namespace Emby.Server.Implementations.LiveTv.EmbyTV
             ILogger logger,
             IMediaEncoder mediaEncoder,
             IServerApplicationPaths appPaths,
-            IJsonSerializer json)
+            IJsonSerializer json,
+            IServerConfigurationManager serverConfigurationManager)
         {
             _logger = logger;
             _mediaEncoder = mediaEncoder;
             _appPaths = appPaths;
             _json = json;
+            _serverConfigurationManager = serverConfigurationManager;
         }
 
         private static bool CopySubtitles => false;
@@ -179,15 +183,17 @@ namespace Emby.Server.Implementations.LiveTv.EmbyTV
 
             var outputParam = string.Empty;
 
+            var threads = EncodingHelper.GetNumberOfThreads(null, _serverConfigurationManager.GetEncodingOptions(), null);
             var commandLineArgs = string.Format(
                 CultureInfo.InvariantCulture,
-                "-i \"{0}\" {2} -map_metadata -1 -threads 0 {3}{4}{5} -y \"{1}\"",
+                "-i \"{0}\" {2} -map_metadata -1 -threads {6} {3}{4}{5} -y \"{1}\"",
                 inputTempFile,
                 targetFile,
                 videoArgs,
                 GetAudioArgs(mediaSource),
                 subtitleArgs,
-                outputParam);
+                outputParam,
+                threads);
 
             return inputModifier + " " + commandLineArgs;
         }

MediaBrowser.MediaEncoding/Encoder/MediaEncoder.cs

@@ -64,6 +64,7 @@ namespace MediaBrowser.MediaEncoding.Encoder
 
         private string _ffmpegPath = string.Empty;
         private string _ffprobePath;
+        private int threads;
 
         public MediaEncoder(
             ILogger<MediaEncoder> logger,
@@ -129,6 +130,7 @@ namespace MediaBrowser.MediaEncoding.Encoder
                 SetAvailableDecoders(validator.GetDecoders());
                 SetAvailableEncoders(validator.GetEncoders());
                 SetAvailableHwaccels(validator.GetHwaccels());
+                threads = EncodingHelper.GetNumberOfThreads(null, _configurationManager.GetEncodingOptions(), null);
             }
 
             _logger.LogInformation("FFmpeg: {EncoderLocation}: {FfmpegPath}", EncoderLocation, _ffmpegPath ?? string.Empty);
@@ -377,9 +379,9 @@ namespace MediaBrowser.MediaEncoding.Encoder
             CancellationToken cancellationToken)
         {
             var args = extractChapters
-                ? "{0} -i {1} -threads 0 -v warning -print_format json -show_streams -show_chapters -show_format"
-                : "{0} -i {1} -threads 0 -v warning -print_format json -show_streams -show_format";
-            args = string.Format(CultureInfo.InvariantCulture, args, probeSizeArgument, inputPath).Trim();
+                ? "{0} -i {1} -threads {2} -v warning -print_format json -show_streams -show_chapters -show_format"
+                : "{0} -i {1} -threads {2} -v warning -print_format json -show_streams -show_format";
+            args = string.Format(CultureInfo.InvariantCulture, args, probeSizeArgument, inputPath, threads).Trim();
 
             var process = new Process
             {
@@ -555,8 +557,8 @@ namespace MediaBrowser.MediaEncoding.Encoder
             // Use ffmpeg to sample 100 (we can drop this if required using thumbnail=50 for 50 frames) frames and pick the best thumbnail. Have a fall back just in case.
             var thumbnail = enableThumbnail ? ",thumbnail=24" : string.Empty;
 
-            var args = useIFrame ? string.Format(CultureInfo.InvariantCulture, "-i {0}{3} -threads 0 -v quiet -vframes 1 -vf \"{2}{4}\" -f image2 \"{1}\"", inputPath, tempExtractPath, vf, mapArg, thumbnail) :
-                string.Format(CultureInfo.InvariantCulture, "-i {0}{3} -threads 0 -v quiet -vframes 1 -vf \"{2}\" -f image2 \"{1}\"", inputPath, tempExtractPath, vf, mapArg);
+            var args = useIFrame ? string.Format(CultureInfo.InvariantCulture, "-i {0}{3} -threads {5} -v quiet -vframes 1 -vf \"{2}{4}\" -f image2 \"{1}\"", inputPath, tempExtractPath, vf, mapArg, thumbnail, threads) :
+                string.Format(CultureInfo.InvariantCulture, "-i {0}{3} -threads {4} -v quiet -vframes 1 -vf \"{2}\" -f image2 \"{1}\"", inputPath, tempExtractPath, vf, mapArg, threads);
 
             var probeSizeArgument = EncodingHelper.GetProbeSizeArgument(1);
             var analyzeDurationArgument = EncodingHelper.GetAnalyzeDurationArgument(1);
@@ -693,7 +695,7 @@ namespace MediaBrowser.MediaEncoding.Encoder
             Directory.CreateDirectory(targetDirectory);
             var outputPath = Path.Combine(targetDirectory, filenamePrefix + "%05d.jpg");
 
-            var args = string.Format(CultureInfo.InvariantCulture, "-i {0} -threads 0 -v quiet -vf \"{2}\" -f image2 \"{1}\"", inputArgument, outputPath, vf);
+            var args = string.Format(CultureInfo.InvariantCulture, "-i {0} -threads {3} -v quiet -vf \"{2}\" -f image2 \"{1}\"", inputArgument, outputPath, vf, threads);
 
             var probeSizeArgument = EncodingHelper.GetProbeSizeArgument(1);
             var analyzeDurationArgument = EncodingHelper.GetAnalyzeDurationArgument(1);