diff --git a/libobs/obs-source.c b/libobs/obs-source.c
index 072283fc9..e607c7b97 100644
--- a/libobs/obs-source.c
+++ b/libobs/obs-source.c
@@ -1831,6 +1831,8 @@ static void clean_cache(obs_source_t *source)
 	}
 }
 
+#define MAX_ASYNC_FRAMES 30
+
 static inline struct obs_source_frame *cache_video(struct obs_source *source,
 		const struct obs_source_frame *frame)
 {
@@ -1838,6 +1840,13 @@ static inline struct obs_source_frame *cache_video(struct obs_source *source,
 
 	pthread_mutex_lock(&source->async_mutex);
 
+	if (source->async_frames.num >= MAX_ASYNC_FRAMES) {
+		free_async_cache(source);
+		source->last_frame_ts = 0;
+		pthread_mutex_unlock(&source->async_mutex);
+		return NULL;
+	}
+
 	if (async_texture_changed(source, frame)) {
 		free_async_cache(source);
 		source->async_cache_width  = frame->width;