clipped k

src-lib/src/ffmpeg.rs

@@ -1,6 +1,21 @@
 use std::str::FromStr;
 use core::cmp::Ordering;
 
+fn clip(output: &String, input: &String, start: f32, stop: f32) -> Result<(), String> {
+   match std::process::Command::new("ffmpeg")
+      .args([
+         "-y",
+         "-ss", &start.to_string(),
+         "-i", input,
+         "-t", &(stop - start).to_string(),
+         output,
+      ])
+      .output() {
+      Ok(_) => Ok(()),
+      Err(msg) => Err(format!("failed to ffmpeg clip {}: {}", input, msg)),
+   }
+}
+
 fn inspect(file: &String) -> Result<Inspection, String> {
    match std::process::Command::new("ffmpeg")
       .args([
@@ -20,7 +35,7 @@ fn inspect(file: &String) -> Result<Inspection, String> {
             lines: line_iter.map(|x| x.to_string()).collect(),
          })
       },
-      Err(msg) => Err(format!("failed to ffmpeg {}: {}", file, msg)),
+      Err(msg) => Err(format!("failed to ffmpeg inspect {}: {}", file, msg)),
    }
 }
 
@@ -161,11 +176,27 @@ impl Inspection {
 #[cfg(test)]
 mod test_inspection {
    use super::*;
+   const FILE: &str = "/Users/breel/Movies/bel_1_1.mp4";
+
+   #[test]
+   fn test_clip() {
+      let output = format!("{}.clipped.mp4", FILE);
+      clip(
+         &output,
+         &FILE.to_string(),
+         3.0,
+         5.0,
+      ).unwrap();
+
+      let inspection = inspect(&output);
+      assert_eq!(true, inspection.is_ok());
+      let inspection = inspection.unwrap();
+      assert_eq!(2.0, inspection.duration());
+   }
 
    #[test]
    fn test_inspect() {
-      let file = "/Users/breel/Movies/bel_1_1.mp4".to_string();
-      let inspection = inspect(&file);
+      let inspection = inspect(&FILE.to_string());
       assert_eq!(true, inspection.is_ok());
       let inspection = inspection.unwrap();