diff --git a/frigate/output/preview.py b/frigate/output/preview.py
index dcf81dc56..650805750 100644
--- a/frigate/output/preview.py
+++ b/frigate/output/preview.py
@@ -77,8 +77,8 @@ class FFMpegConverter(threading.Thread):
         # write a PREVIEW at fps and 1 key frame per clip
         self.ffmpeg_cmd = parse_preset_hardware_acceleration_encode(
             config.ffmpeg.hwaccel_args,
-            input="-f concat -y -protocol_whitelist pipe,file -safe 0 -i /dev/stdin",
-            output=f"-g {PREVIEW_KEYFRAME_INTERVAL} -bf 0 -b:v {PREVIEW_QUALITY_BIT_RATES[self.config.record.preview.quality]} {FPS_VFR_PARAM} -movflags +faststart -pix_fmt yuv420p {self.path}",
+            input="-f concat -y -protocol_whitelist pipe,file -safe 0 -threads 1 -i /dev/stdin",
+            output=f"-threads 1 -g {PREVIEW_KEYFRAME_INTERVAL} -bf 0 -b:v {PREVIEW_QUALITY_BIT_RATES[self.config.record.preview.quality]} {FPS_VFR_PARAM} -movflags +faststart -pix_fmt yuv420p {self.path}",
             type=EncodeTypeEnum.preview,
         )