diff --git a/mov.go b/mov.go
index 88cfa5a..0fa1646 100644
--- a/mov.go
+++ b/mov.go
@@ -4,24 +4,20 @@ import (
 	"bytes"
 	"encoding/binary"
 	"errors"
-	"os"
+	"io"
 	"time"
 )
 
 const epochAdjust = 2082844800
 
 // Created attempts to find a created time from the metadata in a .mov file.
-func Created(path string) (time.Time, error) {
+func Created(file io.ReadSeeker) (time.Time, error) {
 	var r time.Time
-	f, err := os.Open(path)
-	if err != nil {
-		return r, err
-	}
-	defer f.Close()
+	var err error
 
 	buf := [8]byte{}
 	for {
-		_, err := f.Read(buf[:])
+		_, err := file.Read(buf[:])
 		if err != nil {
 			return r, err
 		}
@@ -29,11 +25,11 @@ func Created(path string) (time.Time, error) {
 			break
 		} else {
 			atomSize := binary.BigEndian.Uint32(buf[:])
-			f.Seek(int64(atomSize)-8, 1)
+			file.Seek(int64(atomSize)-8, 1)
 		}
 	}
 
-	_, err = f.Read(buf[:])
+	_, err = file.Read(buf[:])
 	if err != nil {
 		return r, err
 	}
@@ -41,10 +37,10 @@ func Created(path string) (time.Time, error) {
 	s := string(buf[4:8])
 	switch s {
 	case "mvhd":
-		if _, err := f.Seek(4, 1); err != nil {
+		if _, err := file.Seek(4, 1); err != nil {
 			return r, err
 		}
-		_, err = f.Read(buf[:4])
+		_, err = file.Read(buf[:4])
 		if err != nil {
 			return r, err
 		}