diff --git a/src/main/java/net/knarcraft/ffmpegconverter/converter/LetterboxCropper.java b/src/main/java/net/knarcraft/ffmpegconverter/converter/LetterboxCropper.java
index a29bb25..266e66e 100644
--- a/src/main/java/net/knarcraft/ffmpegconverter/converter/LetterboxCropper.java
+++ b/src/main/java/net/knarcraft/ffmpegconverter/converter/LetterboxCropper.java
@@ -160,7 +160,14 @@ public class LetterboxCropper extends AbstractConverter {
             throw new RuntimeException("Unable to get duration from video file");
         }
 
-        int increments = (int) (duration / 30d);
+        int increments;
+        if (duration > 300) {
+            increments = (int) (duration / 30d);
+        } else if (duration > 30) {
+            increments = 5;
+        } else {
+            increments = 1;
+        }
 
         for (int i = 0; i < duration; i += increments) {
             FFMpegCommand clone = probeCommand.clone();