From 176944fa33cd1cb976133de5d44e3ec44f360d2f Mon Sep 17 00:00:00 2001
From: Lyudmil Kavakliyski <77803201+Kavakliyski@users.noreply.github.com>
Date: Sun, 1 Feb 2026 18:12:39 +0200
Subject: [PATCH] fix(ios): use precise time tolerance for thumbnail generation

Set precise time tolerance for image generation to avoid snapping to keyframes.

Sets `requestedTimeToleranceBefore` and `requestedTimeToleranceAfter` to `kCMTimeZero`
to ensure thumbnails are generated at the exact requested timestamp.
---
 ios/CreateThumbnail.m | 3 +++
 1 file changed, 3 insertions(+)

diff --git a/ios/CreateThumbnail.m b/ios/CreateThumbnail.m
index 4c87cfa..40d7ec1 100644
--- a/ios/CreateThumbnail.m
+++ b/ios/CreateThumbnail.m
@@ -141,6 +141,9 @@ - (void) generateThumbImage:(AVURLAsset *)asset atTime:(int)timeStamp maxWidth:(
 - (void) generateLocalMediaThumbImage:(AVAsset *)asset atTime:(int)timeStamp completion:(void (^)(UIImage* thumbnail))completion failure:(void (^)(NSError* error))failure {
     AVAssetImageGenerator *imageGenerator = [[AVAssetImageGenerator alloc] initWithAsset:asset];
     imageGenerator.appliesPreferredTrackTransform = YES;
+    // Set precise time tolerance to avoid snapping to keyframes
+    imageGenerator.requestedTimeToleranceBefore = kCMTimeZero;
+    imageGenerator.requestedTimeToleranceAfter = kCMTimeZero;
     CMTime time = CMTimeMake(timeStamp, 1000);
     NSError *error = nil;
     CMTime actualTime;