diff --git a/Cargo.toml b/Cargo.toml
index c5f102c..e167252 100644
--- a/Cargo.toml
+++ b/Cargo.toml
@@ -1,6 +1,3 @@
 [workspace]
 
-members = [
-    "av1an-core",
-    "av1an-pyo3",
-]
+members = ["av1an-core", "av1an-pyo3", "av1an-scene-detection"]
diff --git a/av1an-core/src/file_validation.rs b/av1an-core/src/file_validation.rs
index 83d5066..03dd242 100644
--- a/av1an-core/src/file_validation.rs
+++ b/av1an-core/src/file_validation.rs
@@ -37,7 +37,7 @@ fn process_inputs(inputs: Vec<&Path>) -> Vec<&Path> {
 
   // Process all inputs (folders and files)
   // into single path vector
-  for fl in inputs {
+  for fl in inputs.clone() {
     if fl.is_dir() {
       for file in fl {
         let path_file = Path::new(file);
@@ -58,6 +58,12 @@ fn process_inputs(inputs: Vec<&Path>) -> Vec<&Path> {
     .filter(|x| match_file_type(*x))
     .collect();
 
+  if result.is_empty() {
+    println!("Not valid inputs");
+    println!("{:#?}", inputs);
+    exit(1);
+  }
+
   result
 }
 
diff --git a/av1an-core/src/lib.rs b/av1an-core/src/lib.rs
index cd28891..ac230f3 100644
--- a/av1an-core/src/lib.rs
+++ b/av1an-core/src/lib.rs
@@ -14,7 +14,6 @@ use std::str::FromStr;
 use std::{fs::File, io::Write};
 use sysinfo::SystemExt;
 
-pub mod aom_kf;
 pub mod concat;
 pub mod ffmpeg;
 pub mod file_validation;
diff --git a/av1an-scene-detection/Cargo.toml b/av1an-scene-detection/Cargo.toml
new file mode 100644
index 0000000..263dd96
--- /dev/null
+++ b/av1an-scene-detection/Cargo.toml
@@ -0,0 +1,7 @@
+[package]
+name = "av1an-scene-detection"
+version = "0.1.0"
+edition = "2018"
+
+
+# See more keys and their definitions at https://doc.rust-lang.org/cargo/reference/manifest.html
diff --git a/av1an-core/src/aom_kf.rs b/av1an-scene-detection/src/aom_kf.rs
similarity index 62%
rename from av1an-core/src/aom_kf.rs
rename to av1an-scene-detection/src/aom_kf.rs
index b6b9a09..9c3d9d6 100644
--- a/av1an-core/src/aom_kf.rs
+++ b/av1an-scene-detection/src/aom_kf.rs
@@ -1,3 +1,5 @@
+use core::f64;
+
 struct AomFirstPassStats {
   frame: u64,                    // Frame number
   weight: u64,                   // Weight assigned to this frame
@@ -27,3 +29,16 @@ struct AomFirstPassStats {
   noise_var: u64,
   cor_coeff: u64,
 }
+
+fn get_second_ref_usage_thresh(frame_count_so_far: u64) -> f64 {
+  let adapt_upto = 32.0;
+  let min_second_ref_usage_thresh = 0.085;
+  let second_ref_usage_thresh_max_delta = 0.035;
+
+  if frame_count_so_far as f64 >= adapt_upto {
+    return min_second_ref_usage_thresh + second_ref_usage_thresh_max_delta;
+  } else {
+    min_second_ref_usage_thresh
+      + (frame_count_so_far as f64 / (adapt_upto - 1.0)) * second_ref_usage_thresh_max_delta
+  }
+}
diff --git a/av1an-scene-detection/src/lib.rs b/av1an-scene-detection/src/lib.rs
new file mode 100644
index 0000000..42fdf1f
--- /dev/null
+++ b/av1an-scene-detection/src/lib.rs
@@ -0,0 +1,3 @@
+#![allow(unused)]
+
+pub mod aom_kf;