diff --git a/src/main.rs b/src/main.rs
index d738de0..ab5f2d2 100644
--- a/src/main.rs
+++ b/src/main.rs
@@ -1,11 +1,11 @@
 use log4rs;
 use config::Config;
-use repository::Repository;
-use transcoder::Transcoder;
+use transcoder::repository::Repository;
+use transcoder::transcoder::Transcoder;
 
 mod config;
-mod repository;
 mod transcoder;
+mod util;
 
 fn main() {
   // initialize the log4rs logger
diff --git a/src/transcoder/mod.rs b/src/transcoder/mod.rs
new file mode 100644
index 0000000..5886b2e
--- /dev/null
+++ b/src/transcoder/mod.rs
@@ -0,0 +1,2 @@
+pub mod repository;
+pub mod transcoder;
\ No newline at end of file
diff --git a/src/repository.rs b/src/transcoder/repository.rs
similarity index 100%
rename from src/repository.rs
rename to src/transcoder/repository.rs
diff --git a/src/transcoder.rs b/src/transcoder/transcoder.rs
similarity index 87%
rename from src/transcoder.rs
rename to src/transcoder/transcoder.rs
index 7baeaee..2a2fbbc 100644
--- a/src/transcoder.rs
+++ b/src/transcoder/transcoder.rs
@@ -4,7 +4,8 @@ use std::{thread, time};
 use log::{info};
 
 use crate::config::Config;
-use crate::repository::Repository;
+use crate::util::io;
+use super::repository::Repository;
 
 pub struct Transcoder {
   config: Config,
@@ -31,6 +32,12 @@ impl Transcoder {
         info!("There were no files found in ingest to transcode; skipping run.");
       } else {
         for i in ingest_files {
+          let ingest_path = Path::new(&self.repository.ingest_dir).join(&i);
+          if io::is_file_locked(&ingest_path.to_str().unwrap()) {
+            info!("{} is currently open in another program; skipping it for this run.", &i);
+            continue;
+          }
+
           // copy the file to the archive
           self.repository.archive_file(&i);
 
diff --git a/src/util/io.rs b/src/util/io.rs
new file mode 100644
index 0000000..ee6bd66
--- /dev/null
+++ b/src/util/io.rs
@@ -0,0 +1,16 @@
+use std::process;
+
+// checks whether a file is currently open in another program (e.g. still being written)
+pub fn is_file_locked(filepath: &str) -> bool {
+  let cmd = process::Command::new("/usr/bin/lsof")
+    .arg(filepath)
+    .output()
+    .expect("Failed to execute command");
+
+  let results = &String::from_utf8_lossy(&cmd.stdout);
+  if results.contains(filepath) {
+    return true;
+  }
+
+  return false;
+}
diff --git a/src/util/mod.rs b/src/util/mod.rs
new file mode 100644
index 0000000..678b90e
--- /dev/null
+++ b/src/util/mod.rs
@@ -0,0 +1 @@
+pub mod io;
\ No newline at end of file