From c7b023222c57d495426c4f985de7a4b634b5599d Mon Sep 17 00:00:00 2001
From: edde746 <86283021+edde746@users.noreply.github.com>
Date: Sun, 3 May 2026 11:12:02 +0200
Subject: [PATCH] fix(exoplayer): apply subtitle sync to ASS subtitles

close #936
---
 .../main/kotlin/com/edde746/plezy/exoplayer/ExoPlayerCore.kt   | 3 ++-
 1 file changed, 2 insertions(+), 1 deletion(-)

diff --git a/android/app/src/main/kotlin/com/edde746/plezy/exoplayer/ExoPlayerCore.kt b/android/app/src/main/kotlin/com/edde746/plezy/exoplayer/ExoPlayerCore.kt
index 21e9bc9b..b208bc2f 100644
--- a/android/app/src/main/kotlin/com/edde746/plezy/exoplayer/ExoPlayerCore.kt
+++ b/android/app/src/main/kotlin/com/edde746/plezy/exoplayer/ExoPlayerCore.kt
@@ -555,7 +555,8 @@ class ExoPlayerCore(private val activity: Activity) : Player.Listener {
       exoPlayer!!.addListener(this)
       exoPlayer!!.addAnalyticsListener(decoderHangListener)
       exoPlayer!!.setVideoFrameMetadataListener { presentationTimeUs, releaseTimeNs, _, _ ->
-        assSubtitleSurfaceView?.requestRender(presentationTimeUs, releaseTimeNs)
+        // ASS bypasses Media3's text renderer, so apply sub-delay before libass renders.
+        assSubtitleSurfaceView?.requestRender(presentationTimeUs - subtitleDelayUs.get(), releaseTimeNs)
         val count = fpsTimestampCount
         if (count < FPS_SAMPLE_COUNT) {
           fpsTimestamps[count] = presentationTimeUs