diff --git a/src/adapters/ffmpeg.rs b/src/adapters/ffmpeg.rs
index 553cafb..40274d0 100644
--- a/src/adapters/ffmpeg.rs
+++ b/src/adapters/ffmpeg.rs
@@ -78,7 +78,6 @@ impl FileAdapter for FFmpegAdapter {
             if !probe.status.success() {
                 return Err(format_err!("ffprobe failed: {:?}", probe.status));
             }
-            println!("{}", String::from_utf8_lossy(&probe.stdout));
             let p: FFprobeOutput = serde_json::from_slice(&probe.stdout)?;
             (p.streams.iter().count() > 0)
         };
diff --git a/src/caching_writer.rs b/src/caching_writer.rs
index 8f5bb8a..305a645 100644
--- a/src/caching_writer.rs
+++ b/src/caching_writer.rs
@@ -1,4 +1,5 @@
 use failure::Fallible;
+use log::*;
 use std::io::Write;
 
 /**
diff --git a/src/preproc.rs b/src/preproc.rs
index 058337b..b000296 100644
--- a/src/preproc.rs
+++ b/src/preproc.rs
@@ -97,8 +97,10 @@ pub fn rga_preproc(ai: AdaptInfo) -> Result<(), Error> {
                             .finish()?;
                         if let Some(cached) = compressed {
                             eprintln!("compressed len: {}", cached.len());
-                        };
-                        Ok(None)
+                            Ok(Some(cached))
+                        } else {
+                            Ok(None)
+                        }
                     }),
                     Box::new(|cached| {
                         let stdouti = std::io::stdout();
diff --git a/src/preproc_cache.rs b/src/preproc_cache.rs
index ce9ba3b..7b0b8e4 100644
--- a/src/preproc_cache.rs
+++ b/src/preproc_cache.rs
@@ -1,4 +1,5 @@
 use failure::{format_err, Fallible};
+use log::*;
 use std::sync::{Arc, RwLock};
 
 pub fn open() -> Fallible<Arc<RwLock<dyn PreprocCache>>> {
@@ -71,10 +72,12 @@ impl PreprocCache for LmdbCache {
 
         match cached {
             Some(rkv::Value::Blob(cached)) => {
+                debug!("got cached");
                 callback(cached)?;
             }
             Some(_) => Err(format_err!("Integrity: value not blob"))?,
             None => {
+                debug!("did not get cached");
                 drop(reader);
                 if let Some(got) = runner()? {
                     let mut writer = db_env.write().map_err(|p| {