diff --git a/src/main.rs b/src/main.rs
index 6ddbbc9..a234c1e 100644
--- a/src/main.rs
+++ b/src/main.rs
@@ -7,6 +7,7 @@ mod resamplers;
 mod amdemod;
 mod aptsyncer;
 
+use std::io::prelude::*;
 use std::fs::File;
 use std::path::Path;
 
@@ -20,71 +21,32 @@ const LINES_PER_SECOND: u32 = 2;
 const PIXELS_PER_LINE: u32 = 2080;
 
 const LOWPASS_COEFFS : [f32; 63] = [ -7.383784e-03,
-        -3.183046e-03,
-        2.255039e-03,
-        7.461166e-03,
-        1.091908e-02,
-        1.149109e-02,
-        8.769802e-03,
-        3.252932e-03,
-        -3.720606e-03,
-        -1.027446e-02,
-        -1.447403e-02,
-        -1.486427e-02,
-        -1.092423e-02,
-        -3.307958e-03,
-        6.212477e-03,
-        1.511364e-02,
-        2.072873e-02,
-        2.096037e-02,
-        1.492345e-02,
-        3.347624e-03,
-        -1.138407e-02,
-        -2.560252e-02,
-        -3.507114e-02,
-        -3.591225e-02,
-        -2.553830e-02,
-        -3.371569e-03,
-        2.882645e-02,
-        6.711368e-02,
-        1.060042e-01,
-        1.394643e-01,
-        1.620650e-01,
-        1.700462e-01,
-        1.620650e-01,
-        1.394643e-01,
-        1.060042e-01,
-        6.711368e-02,
-        2.882645e-02,
-        -3.371569e-03,
-        -2.553830e-02,
-        -3.591225e-02,
-        -3.507114e-02,
-        -2.560252e-02,
-        -1.138407e-02,
-        3.347624e-03,
-        1.492345e-02,
-        2.096037e-02,
-        2.072873e-02,
-        1.511364e-02,
-        6.212477e-03,
-        -3.307958e-03,
-        -1.092423e-02,
-        -1.486427e-02,
-        -1.447403e-02,
-        -1.027446e-02,
-        -3.720606e-03,
-        3.252932e-03,
-        8.769802e-03,
-        1.149109e-02,
-        1.091908e-02,
-        7.461166e-03,
-        2.255039e-03,
-        -3.183046e-03,
-        -7.383784e-03];
+        -3.183046e-03,  2.255039e-03,   7.461166e-03,   1.091908e-02,
+        1.149109e-02,   8.769802e-03,   3.252932e-03,   -3.720606e-03,
+        -1.027446e-02,  -1.447403e-02,  -1.486427e-02,  -1.092423e-02,
+        -3.307958e-03,  6.212477e-03,   1.511364e-02,   2.072873e-02,
+        2.096037e-02,   1.492345e-02,   3.347624e-03,   -1.138407e-02,
+        -2.560252e-02,  -3.507114e-02,  -3.591225e-02,  -2.553830e-02,
+        -3.371569e-03,  2.882645e-02,   6.711368e-02,   1.060042e-01,
+        1.394643e-01,   1.620650e-01,   1.700462e-01,   1.620650e-01,
+        1.394643e-01,   1.060042e-01,   6.711368e-02,   2.882645e-02,
+        -3.371569e-03,  -2.553830e-02,  -3.591225e-02,  -3.507114e-02,
+        -2.560252e-02,  -1.138407e-02,  3.347624e-03,   1.492345e-02,
+        2.096037e-02,   2.072873e-02,   1.511364e-02,   6.212477e-03,
+        -3.307958e-03,  -1.092423e-02,  -1.486427e-02,  -1.447403e-02,
+        -1.027446e-02,  -3.720606e-03,  3.252932e-03,   8.769802e-03,
+        1.149109e-02,   1.091908e-02,   7.461166e-03,   2.255039e-03,
+        -3.183046e-03,  -7.383784e-03];
 
 fn main() {
-    let mut reader = match hound::WavReader::open("noaa19_20160814_mono.wav") {
+    let args : Vec<String> = std::env::args().collect();
+
+    if args.len() != 3 {
+        println!("Usage: {} <wav file> <output file>", args[0]);
+        return;
+    }
+
+    let mut reader = match hound::WavReader::open(&args[1]) {
         Err(e) => panic!("Could not open inputfile: {}", e),
         Ok(r) => r
     };
@@ -120,7 +82,20 @@ fn main() {
     let mut y = 0;
     let mut max_level = 0.0;
 
+    let mut progress = 0;
+    let step = sample_count * 13 / 150 / 10;
+
+    print!("0%");
+    std::io::stdout().flush().unwrap();
     for synced_sample in syncer {
+        progress += 1;
+
+        if progress % step == 0 {
+            print!("...{}%", progress / step * 10);
+            std::io::stdout().flush().unwrap();
+        }
+
+
         let sample = match synced_sample {
             SyncedSample::Sample(s) => s,
             SyncedSample::SyncA(s) =>{
@@ -136,8 +111,6 @@ fn main() {
         max_level = f32::max(sample, max_level);
         let color = (sample / max_level * 255.0) as u8;
 
-        //println!("{}", color);
-
         if y < lines {
             img.put_pixel(x,y,image::Luma([color]));
         }
@@ -148,7 +121,14 @@ fn main() {
             y += 1;
         }
     }
+    println!("");
 
-    let ref mut fout = File::create(&Path::new("decoded.png")).unwrap();
+    let ref mut fout = match File::create(&Path::new(&args[2])) {
+        Err(e) => panic!("Could not open outputfile: {}", e),
+        Ok(f) => f
+    };
+    
     image::ImageLuma8(img).save(fout, image::PNG).unwrap();
+
+    println!("Done !");
 }