diff --git a/src/config.rs b/src/config.rs
index e7f6065..968a24f 100644
--- a/src/config.rs
+++ b/src/config.rs
@@ -17,10 +17,11 @@
 
 use std::{
     ffi::OsStr,
-    path::{Path, PathBuf},
+    path::{Path, PathBuf}, collections::HashSet, borrow::Cow,
 };
 
 use clap::{crate_name, crate_version, Arg, ArgMatches};
+use itertools::Either;
 use rayon::prelude::*;
 use serde::{Deserialize, Serialize};
 
@@ -383,11 +384,11 @@ impl Config {
     ) -> Vec<PathBuf> {
         let auto_extension_filter = include_str!("../data/ffmpeg_extensions_list.txt");
 
-        raw_paths
+        let (bad_extensions, valid_paths): (Vec<_>, Vec<_>) = raw_paths
             .into_par_iter()
             .filter(|path| {
                 if path.exists() {
-                    return true
+                    return true;
                 }
 
                 eprintln!("Error: Path does not exist: {:?}", path);
@@ -395,46 +396,64 @@ impl Config {
             })
             .filter(|path| {
                 if path.is_file() {
-                    return true
+                    return true;
                 }
 
                 eprintln!("Error: Path is not a file: {:?}", path);
                 false
             })
-            .filter(|path| match path.to_str() {
-                Some(_) => true,
-                None => {
-                    eprintln!("Error: Path cannot be serialized to string: {:?}", path);
-                    false
+            .filter(|path| {
+                if path.to_str().is_some() {
+                    return true;
                 }
+
+                eprintln!("Error: Path cannot be serialized to string: {:?}", path);
+                false
             })
             .filter(|path| path.file_name() != Some(OsStr::new(hash_file)))
-            .filter(|path| {
+            .filter_map(|path| {
                 if !opt_disable_filter {
+                    let opt_extension = path.extension();
+
                     if auto_extension_filter
                         .lines()
-                        .any(|extension| {
-                            path.extension() == Some(OsStr::new(extension))
-                        }) {
-                            return true
-                        }
-
-                    if !opt_silent && path.extension().is_some() {
-                        eprintln!("WARNING: {:?} contains an extension which is unknown to dano.  If you know this file type is acceptable to ffmpeg, you may use --disable-filter to force dano to accept its use.", path);
+                        .any(|extension| opt_extension == Some(OsStr::new(extension)))
+                    {
+                        return Some(Either::Right(path.as_path()));
                     }
 
-                    return false
-                }
+                    if let Some(ext) = opt_extension {
+                        return Some(Either::Left(ext.to_string_lossy()));
+                    }
 
-                true
-            })
-            .map(|path| {
-                if opt_canonical_paths {
-                    path.canonicalize().unwrap_or_else(|_| path.to_owned())
-                } else {
-                    path.to_owned()
+                    return None;
                 }
-            })
-            .collect()
+
+                Some(Either::Right(path.as_path()))
+            }).partition_map(|item|{
+                item
+            });
+
+        if !opt_silent && !bad_extensions.is_empty() {
+            let unique: HashSet<Cow<str>> = bad_extensions.into_iter().collect();
+
+            let mut buffer = String::new();
+
+            unique.iter().for_each(|ext| {
+                buffer.push_str(ext);
+                buffer.push_str(" ");
+            });
+
+            eprintln!("WARNING: The following are extensions which are unknown to dano: {:?}.  dano has excluded all files with these extensions.  If you know this file type is acceptable to ffmpeg, you may use --disable-filter to force dano to accept its use.", buffer.trim());
+        }
+
+        valid_paths.iter().map(|path| {
+            if opt_canonical_paths {
+                path.canonicalize().unwrap_or_else(|_| path.to_path_buf())
+            } else {
+                path.to_path_buf()
+            }
+        })
+        .collect()
     }
 }
diff --git a/src/output.rs b/src/output.rs
index 519b896..a7dca6c 100644
--- a/src/output.rs
+++ b/src/output.rs
@@ -80,14 +80,16 @@ impl Deref for WriteOutBundle {
 
 impl WriteOutBundle {
     pub fn write_out(self, config: &Config) -> DanoResult<()> {
-        self.into_inner().into_iter().try_for_each(|remainder_bundle| {
-            if !remainder_bundle.files.is_empty() {
-                remainder_bundle.write_out(config)
-            } else {
-                Self::print_bundle_empty(config, &remainder_bundle.remainder_type);
-                Ok(())
-            }
-        })
+        self.into_inner()
+            .into_iter()
+            .try_for_each(|remainder_bundle| {
+                if !remainder_bundle.files.is_empty() {
+                    remainder_bundle.write_out(config)
+                } else {
+                    Self::print_bundle_empty(config, &remainder_bundle.remainder_type);
+                    Ok(())
+                }
+            })
     }
 
     fn print_bundle_empty(config: &Config, remainder_type: &RemainderType) {
diff --git a/src/utility.rs b/src/utility.rs
index 6762476..9864735 100644
--- a/src/utility.rs
+++ b/src/utility.rs
@@ -146,15 +146,12 @@ pub fn print_file_info(config: &Config, file_info: &FileInfo) -> DanoResult<()>
             )
         }
         None => {
-            let msg = format!(
-                "Could not find file metadata for: {:?}\n",
-                file_info.path
-            );
+            let msg = format!("Could not find file metadata for: {:?}\n", file_info.path);
             return Err(DanoError::new(&msg).into());
         }
     };
 
-    // why?  b/c the writing of the file is the thing in write and dump mode and 
+    // why?  b/c the writing of the file is the thing in write and dump mode and
     // this fn used then is just to print info about the hash.  we may wish to send to dev null
     match config.exec_mode {
         ExecMode::Print | ExecMode::Duplicates | ExecMode::Test(_) => print_out_buf(&buffer),