feat: dl progress

internal/downloader/downloader.go

@@ -204,20 +204,29 @@ func downloadPlaylist(ctx context.Context, client *http.Client, parsed *url.URL,
 	}()
 
 	segments := collectSegments(mediaPlaylist)
+	totalSegments := len(segments)
+	fmt.Fprintf(os.Stderr, "Downloading %d segments...\n", totalSegments)
+
 	for i, segment := range segments {
 		if err := downloadSegment(ctx, client, finalURL, segment, tempTS); err != nil {
 			return fmt.Errorf("download segment %d: %w", i, err)
 		}
+		// Show progress: segment number, total, and percentage
+		progress := float64(i+1) / float64(totalSegments) * 100
+		fmt.Fprintf(os.Stderr, "\rProgress: %d/%d segments (%.1f%%)", i+1, totalSegments, progress)
 	}
+	fmt.Fprintf(os.Stderr, "\n")
 
 	if _, err := tempTS.Seek(0, io.SeekStart); err != nil {
 		return fmt.Errorf("rewind temp file: %w", err)
 	}
 
 	mp4Name := ensureMP4Extension(name)
+	fmt.Fprintf(os.Stderr, "Converting to MP4...\n")
 	if err := transmuxToMP4(ctx, tempPath, mp4Name); err != nil {
 		return err
 	}
+	fmt.Fprintf(os.Stderr, "Complete: %s\n", mp4Name)
 
 	return nil
 }