diff --git a/Sources/KSPlayer/MEPlayer/FFmpegAssetTrack.swift b/Sources/KSPlayer/MEPlayer/FFmpegAssetTrack.swift
index 4039f118..133ad38f 100644
--- a/Sources/KSPlayer/MEPlayer/FFmpegAssetTrack.swift
+++ b/Sources/KSPlayer/MEPlayer/FFmpegAssetTrack.swift
@@ -81,7 +81,9 @@ public class FFmpegAssetTrack: MediaPlayerTrack {
         if timebase.num <= 0 || timebase.den <= 0 {
             timebase = Timebase(num: 1, den: 1000)
         }
-        startTime = timebase.cmtime(for: stream.pointee.start_time)
+        if stream.pointee.start_time != Int64.min {
+            startTime = timebase.cmtime(for: stream.pointee.start_time)
+        }
         self.timebase = timebase
         avgFrameRate = Timebase(stream.pointee.avg_frame_rate)
         realFrameRate = Timebase(stream.pointee.r_frame_rate)
diff --git a/Sources/KSPlayer/MEPlayer/SubtitleDecode.swift b/Sources/KSPlayer/MEPlayer/SubtitleDecode.swift
index 53a9e455..1cba697f 100644
--- a/Sources/KSPlayer/MEPlayer/SubtitleDecode.swift
+++ b/Sources/KSPlayer/MEPlayer/SubtitleDecode.swift
@@ -59,7 +59,7 @@ class SubtitleDecode: DecodeProtocol {
             duration = packet.assetTrack.timebase.cmtime(for: packet.duration).seconds
         }
         if let preSubtitleFrame, preSubtitleFrame.part.end == preSubtitleFrame.part.start {
-            if start == preSubtitleFrame.part.end {
+            if preSubtitleFrame.part.end >= start {
                 return
             } else {
                 preSubtitleFrame.part.end = start