diff --git a/quicktex/cli/common.py b/quicktex/cli/common.py
index 7c62897..5beea0d 100644
--- a/quicktex/cli/common.py
+++ b/quicktex/cli/common.py
@@ -40,7 +40,7 @@ def path_pairs(inputs, output, suffix, extension):
     """
 
     if len(inputs) < 1:
-        raise click.BadArgumentUsage('No input files were provided.')
+        raise click.BadArgumentUsage('No valid input files were provided.')
 
     inpaths = [pathlib.Path(i) for i in inputs]
 
diff --git a/quicktex/cli/encode.py b/quicktex/cli/encode.py
index 0aa3e33..fee90fd 100644
--- a/quicktex/cli/encode.py
+++ b/quicktex/cli/encode.py
@@ -37,6 +37,7 @@ def encode():
 )
 @click.argument('filenames', nargs=-1, type=click.Path(exists=True, readable=True, dir_okay=False))
 def encode_format(encoder, four_cc, flip, remove, suffix, output, filenames, swizzle=False):
+    filenames = [f for f in filenames if not f.endswith('.dds')]
     path_pairs = common.path_pairs(filenames, output, suffix, '.dds')
 
     with click.progressbar(
@@ -112,8 +113,11 @@ def encode_auto(level, black, threecolor, flip, remove, suffix, output, filename
 
     bc1_encoder = quicktex.s3tc.bc1.BC1Encoder(level, mode)
     bc3_encoder = quicktex.s3tc.bc3.BC3Encoder(level)
+    filenames = [f for f in filenames if not f.endswith('.dds')]
     path_pairs = common.path_pairs(filenames, output, suffix, '.dds')
 
+    assert len(filenames) > 0
+
     with click.progressbar(
         path_pairs, show_eta=False, show_pos=True, item_show_func=lambda x: str(x[0]) if x else ''
     ) as bar: