Fix race condition in Scene Detection causes End of File Error

Author: Boats McGee

av1an-core/src/scene_detect.rs

@@ -47,6 +47,7 @@ pub fn av_scenechange_detect(
     frames
   });
 
+  let frames = frame_thread.join().unwrap();
   let scenes = scene_detect(
     input,
     encoder,
@@ -66,8 +67,6 @@ pub fn av_scenechange_detect(
     zones,
   )?;
 
-  let frames = frame_thread.join().unwrap();
-
   progress_bar::finish_progress_bar();
 
   Ok((scenes, frames))