fix: limit thumbnail generation to 1 thread per image

src/previews/video.rs

@@ -12,6 +12,7 @@ pub struct VideoPath<'a>(pub &'a Path);
 impl<'a> Previewable for VideoPath<'a> {
     fn get_thumbnail(&self) -> Result<Option<Vec<u8>>> {
         let duration_cmd = Command::new("ffprobe")
+            .args(["-threads", "1"])
             .args(["-v", "error"])
             .args(["-show_entries", "format=duration"])
             .args(["-of", "default=noprint_wrappers=1:nokey=1"])
@@ -28,6 +29,7 @@ impl<'a> Previewable for VideoPath<'a> {
             .parse::<f64>()?;
         let outfile = tempfile::Builder::new().suffix(".webp").tempfile()?;
         let thumbnail_cmd = Command::new("ffmpeg")
+            .args(["-threads", "1"])
             .args(["-i", &self.0.to_string_lossy()])
             .args(["-vframes", "1"])
             .args(["-ss", &(300f64.min(duration / 4.0)).to_string()])