optimize image playback (#1609)

ErsatzTV.FFmpeg/Filter/LoopFilter.cs

@@ -0,0 +1,8 @@
+namespace ErsatzTV.FFmpeg.Filter;
+
+public class LoopFilter : BaseFilter
+{
+    public override FrameState NextState(FrameState currentState) => currentState;
+
+    public override string Filter => "loop=-1:1";
+}

ErsatzTV.FFmpeg/InputOption/InfiniteLoopInputOption.cs

@@ -17,11 +17,11 @@ public class InfiniteLoopInputOption : IInputOption
         // loop 1 for still images
         if (inputFile.Streams.OfType<VideoStream>().Any(s => s.StillImage))
         {
-            return new[] { "-loop", "1" };
+            return ["-loop", "1"];
         }
 
         // stream_loop for looped video i.e. filler
-        return new[] { "-stream_loop", "-1" };
+        return ["-stream_loop", "-1"];
     }
 
     public string[] FilterOptions => Array.Empty<string>();

ErsatzTV.FFmpeg/InputOption/ReadrateInputOption.cs

@@ -55,7 +55,7 @@ public class ReadrateInputOption : IInputOption
     public string[] OutputOptions => Array.Empty<string>();
     public FrameState NextState(FrameState currentState) => currentState with { Realtime = true };
 
-    public bool AppliesTo(AudioInputFile audioInputFile) => true;
+    public bool AppliesTo(AudioInputFile audioInputFile) => audioInputFile is not NullAudioInputFile;
 
     // don't use realtime input for a still image
     public bool AppliesTo(VideoInputFile videoInputFile) => videoInputFile.VideoStreams.All(s => !s.StillImage);

ErsatzTV.FFmpeg/Pipeline/NvidiaPipelineBuilder.cs

@@ -161,6 +161,7 @@ public class NvidiaPipelineBuilder : SoftwarePipelineBuilder
         currentState = SetScale(videoInputFile, videoStream, context, ffmpegState, desiredState, currentState);
         currentState = SetPad(videoInputFile, videoStream, desiredState, currentState);
         currentState = SetCrop(videoInputFile, desiredState, currentState);
+        SetStillImageLoop(videoInputFile, videoStream);
 
         if (currentState.BitDepth == 8 && context.HasSubtitleOverlay || context.HasWatermark)
         {

ErsatzTV.FFmpeg/Pipeline/PipelineBuilderBase.cs

@@ -440,7 +440,7 @@ public abstract class PipelineBuilderBase : IPipelineBuilder
             ? None
             : SetDecoder(videoInputFile, videoStream, ffmpegState, context);
 
-        SetStillImageInfiniteLoop(videoInputFile, videoStream, ffmpegState);
+        //SetStillImageInfiniteLoop(videoInputFile, videoStream, ffmpegState);
         SetRealtimeInput(videoInputFile, ffmpegState, desiredState);
         SetInfiniteLoop(videoInputFile, videoStream, ffmpegState, desiredState);
         SetFrameRateOutput(desiredState, pipelineSteps);
@@ -643,14 +643,11 @@ public abstract class PipelineBuilderBase : IPipelineBuilder
         videoInputFile.AddOption(new ReadrateInputOption(_ffmpegCapabilities, initialBurst, _logger));
     }
 
-    private static void SetStillImageInfiniteLoop(
+    protected static void SetStillImageLoop(VideoInputFile videoInputFile, VideoStream videoStream)
-        VideoInputFile videoInputFile,
-        VideoStream videoStream,
-        FFmpegState ffmpegState)
     {
         if (videoStream.StillImage)
         {
-            videoInputFile.AddOption(new InfiniteLoopInputOption(ffmpegState.EncoderHardwareAccelerationMode));
+            videoInputFile.FilterSteps.Add(new LoopFilter());
         }
     }
 

ErsatzTV.FFmpeg/Pipeline/QsvPipelineBuilder.cs

@@ -166,6 +166,7 @@ public class QsvPipelineBuilder : SoftwarePipelineBuilder
         currentState = SetPad(videoInputFile, videoStream, desiredState, currentState);
         // _logger.LogDebug("After pad: {PixelFormat}", currentState.PixelFormat);
         currentState = SetCrop(videoInputFile, desiredState, currentState);
+        SetStillImageLoop(videoInputFile, videoStream);
 
         // need to download for any sort of overlay
         if (currentState.FrameDataLocation == FrameDataLocation.Hardware &&

ErsatzTV.FFmpeg/Pipeline/SoftwarePipelineBuilder.cs

@@ -105,6 +105,7 @@ public class SoftwarePipelineBuilder : PipelineBuilderBase
             currentState = SetScale(videoInputFile, videoStream, desiredState, currentState);
             currentState = SetPad(videoInputFile, videoStream, desiredState, currentState);
             currentState = SetCrop(videoInputFile, desiredState, currentState);
+            SetStillImageLoop(videoInputFile, videoStream);
             SetSubtitle(
                 videoInputFile,
                 subtitleInputFile,

ErsatzTV.FFmpeg/Pipeline/VaapiPipelineBuilder.cs

@@ -170,6 +170,8 @@ public class VaapiPipelineBuilder : SoftwarePipelineBuilder
 
         currentState = SetCrop(videoInputFile, desiredState, currentState);
 
+        SetStillImageLoop(videoInputFile, videoStream);
+
         // need to upload for hardware overlay
         bool forceSoftwareOverlay = context is { HasSubtitleOverlay: true, HasWatermark: true }
                                     || ffmpegState.VaapiDriver == "radeonsi";