diff --git a/cmps_hevc_crf18.py b/cmps_hevc_crf18.py
index 990a7d6..9ca597b 100755
--- a/cmps_hevc_crf18.py
+++ b/cmps_hevc_crf18.py
@@ -176,6 +176,7 @@ def main():
         errmsg = 'No input files provided'
     if not files:
         raise SystemExit(errmsg)
+    files.sort(key=lambda x: x.stat().st_size)
 
     for idx, infile in enumerate(files, 1):
         logger.info(f"[{idx}/{len(files)}] {infile.name}")