diff --git a/libs/ffmpeg/builders.js b/libs/ffmpeg/builders.js
index 09c08a48..f321b0c8 100644
--- a/libs/ffmpeg/builders.js
+++ b/libs/ffmpeg/builders.js
@@ -690,7 +690,7 @@ module.exports = (s,config,lang) => {
             const { videoWidth, videoHeight } = validateDimensions(e.details.event_record_scale_x,e.details.event_record_scale_y)
             const hlsTime = !isNaN(parseInt(e.details.detector_buffer_hls_time)) ? `${parseInt(e.details.detector_buffer_hls_time)}` : '5'
             // const hlsListSize = !isNaN(parseInt(e.details.detector_buffer_hls_list_size)) ? `${parseInt(e.details.detector_buffer_hls_list_size)}` : '4'
-            const secondsBefore = roundNearest5(parseInt(e.detector_buffer_seconds_before)) || 5
+            const secondsBefore = roundNearest5(parseInt(e.details.detector_buffer_seconds_before)) || 5
             let hlsListSize = parseInt(secondsBefore / 5 + 3)
             // hlsListSize = hlsListSize < 5 ? 5 : hlsListSize;
             if(inputMap)outputFlags.push(inputMap)