add lib::video::inspect_async

src-lib/src/video.rs

@@ -131,6 +131,36 @@ fn _inspect(file: &String) -> Result<Inspection, String> {
 
 }
 
+pub async fn inspect_async(file: &String) -> Result<Vec<ContentSpan>, String> {
+   match _inspect_async(file).await {
+      Ok(inspection) => Ok(inspection.content_spans()),
+      Err(msg) => Err(msg)
+   }
+}
+
+async fn _inspect_async(file: &String) -> Result<Inspection, String> {
+   match async_process::Command::new("ffmpeg")
+      .args([
+         "-i", file,
+         "-vf", "mpdecimate,select='gt(scene,0.0)'",
+         "-af", "silencedetect=n=-50dB:d=1",
+         "-loglevel", "debug",
+         "-f", "null",
+         "-",
+      ])
+      .output().await {
+      Ok(output) => {
+         let stderr = String::from_utf8(output.stderr).unwrap();
+         let stdout = String::from_utf8(output.stdout).unwrap();
+         let line_iter = stderr.split("\n").chain(stdout.split("\n"));
+         Ok(Inspection{
+            lines: line_iter.map(|x| x.to_string()).collect(),
+         })
+      },
+      Err(msg) => Err(format!("failed to inspect with ffmpeg: {}", msg)),
+   }
+}
+
 struct Inspection {
    lines: Vec<String>,
 }
@@ -352,8 +382,9 @@ mod test_inspection {
 
       assert_eq!(28.14, inspection.duration());
 
-      assert_eq!(1, inspection.visual_transitions_scene_splits().len()); // TODO
-      assert_eq!(0.65986, inspection.visual_transitions_scene_splits()[0]); // TODO
+      assert_eq!(2, inspection.visual_transitions_scene_splits().len()); // TODO
+      assert_eq!(0.307763, inspection.visual_transitions_scene_splits()[0]); // TODO
+      assert_eq!(0.65986, inspection.visual_transitions_scene_splits()[1]); // TODO
 
       assert_eq!(4, inspection.visual_transitions_unstuck_frames().len());
       assert_eq!(