Update progress on main thread

Author: finnvoor

Sources/Upscaling/UpscalingExportSession.swift

@@ -383,7 +383,9 @@ public class UpscalingExportSession {
                 while assetWriterInput.isReadyForMoreMediaData {
                     if let nextSampleBuffer = assetReaderOutput.copyNextSampleBuffer() {
                         if nextSampleBuffer.presentationTimeStamp.isNumeric {
-                            progress.completedUnitCount = Int64(nextSampleBuffer.presentationTimeStamp.seconds)
+                            DispatchQueue.main.async {
+                                progress.completedUnitCount = Int64(nextSampleBuffer.presentationTimeStamp.seconds)
+                            }
                         }
                         if let imageBuffer = nextSampleBuffer.imageBuffer {
                             let upscaledImageBuffer = upscaler.upscale(
@@ -433,7 +435,9 @@ public class UpscalingExportSession {
                 while assetWriterInput.isReadyForMoreMediaData {
                     if let nextSampleBuffer = assetReaderOutput.copyNextSampleBuffer() {
                         if nextSampleBuffer.presentationTimeStamp.isNumeric {
-                            progress.completedUnitCount = Int64(nextSampleBuffer.presentationTimeStamp.seconds)
+                            DispatchQueue.main.async {
+                                progress.completedUnitCount = Int64(nextSampleBuffer.presentationTimeStamp.seconds)
+                            }
                         }
                         if let taggedBuffers = nextSampleBuffer.taggedBuffers {
                             let leftEyeBuffer = taggedBuffers.first(where: {