improve live stream reliability (#2524)

CHANGELOG.md

@@ -27,6 +27,7 @@ The format is based on [Keep a Changelog](https://keepachangelog.com/en/1.0.0/).
 - Fix remote stream durations in playouts created using block, sequential or scripted schedules
 - Fix playback troubleshooting selecting a subtitle even with no subtitle stream selected in the UI
 - Fix intermittent watermark opacity
+- Improve reliability of live remote streams; they should transcode closer to realtime in most cases
 
 ### Changed
 - Do not use graphics engine for single, permanent watermark

ErsatzTV.FFmpeg/InputOption/ReadrateInputOption.cs

@@ -41,11 +41,10 @@ public class ReadrateInputOption : IInputOption
             }
 
             result.AddRange(
-                new[]
-                {
-                    "-readrate_initial_burst",
+            [
+                "-readrate_initial_burst",
                     _initialBurstSeconds.ToString(CultureInfo.InvariantCulture)
-                });
+            ]);
         }
 
         return result.ToArray();

ErsatzTV.FFmpeg/Pipeline/PipelineBuilderBase.cs

@@ -762,6 +762,11 @@ public abstract class PipelineBuilderBase : IPipelineBuilder
 
     private void SetRealtimeInput(VideoInputFile videoInputFile, FrameState desiredState)
     {
+        if (videoInputFile.StreamInputKind is StreamInputKind.Live)
+        {
+            return;
+        }
+
         int initialBurst;
         if (!desiredState.Realtime)
         {