Return EOF when fetchedCount == 0

Author: Isaac

submodules/MediaPlayer/Sources/FFMpegMediaFrameSourceContext.swift

@@ -184,6 +184,10 @@ private func readPacketCallback(userData: UnsafeMutableRawPointer?, buffer: Unsa
         }
         fetchedCount = Int32(fetchedData.count)
         context.readingOffset += Int64(fetchedCount)
+        
+        if fetchedCount == 0 {
+            return FFMPEG_CONSTANT_AVERROR_EOF
+        }
     }
 
     if context.closed {

submodules/MediaPlayer/Sources/UniversalSoftwareVideoSource.swift

@@ -70,6 +70,9 @@ private func readPacketCallback(userData: UnsafeMutableRawPointer?, buffer: Unsa
         }
         let fetchedCount = Int32(fetchedData.count)
         context.readingOffset += Int64(fetchedCount)
+        if fetchedCount == 0 {
+            return FFMPEG_CONSTANT_AVERROR_EOF
+        }
         return fetchedCount
     } else {
         return FFMPEG_CONSTANT_AVERROR_EOF