diff --git a/bin/ffx.py b/bin/ffx.py
index 72df362..ad117f7 100755
--- a/bin/ffx.py
+++ b/bin/ffx.py
@@ -523,7 +523,7 @@ def convert(ctx,
     qualityKwargs = {QualityFilter.QUALITY_KEY: quality}
     qf = QualityFilter(**qualityKwargs)
 
-    if context['video_encoder'] == VideoEncoder.AV1:
+    if context['video_encoder'] == VideoEncoder.AV1 and preset:
         presetKwargs = {PresetFilter.PRESET_KEY: preset}
         PresetFilter(**presetKwargs)