[Subtitles][WebVTT] Fix reversed pts offset correction

xbmc · Apr 11, 2023 · d603ba0 · d603ba0
1 parent bcadd75
commit d603ba0
Showing 1 changed file with 5 additions and 1 deletion.
diff --git a/xbmc/cores/VideoPlayer/DVDCodecs/Overlay/OverlayCodecWebVTT.cpp b/xbmc/cores/VideoPlayer/DVDCodecs/Overlay/OverlayCodecWebVTT.cpp
@@ -80,7 +80,11 @@ OverlayMessage COverlayCodecWebVTT::Decode(DemuxPacket* pPacket)
 
   m_webvttHandler.Reset();
 
-  m_webvttHandler.SetPeriodStart(pPacket->m_ptsOffsetCorrection);
+  // WebVTT subtitles has no relation with packet PTS then if
+  // a period/chapter change happens (e.g. HLS streaming) VP can detect a discontinuity
+  // and adjust the packet PTS by substracting the pts offset correction value,
+  // so here we have to adjust WebVTT subtitles PTS by substracting it at same way
+  m_webvttHandler.SetPeriodStart(pPacket->m_ptsOffsetCorrection * -1);
 
   if (m_isISOFormat)
   {