fix: ctx cancellation

internal/downloader/downloader.go

@@ -24,6 +24,7 @@ import (
 
 const (
 	defaultClientTimeout = 30 * time.Second
+	vodSegmentTimeout    = 5 * time.Minute // Longer timeout for VOD segments which can be large
 	maxRedirects         = 5
 	playlistPollInterval = 2 * time.Second // Poll interval for livestreams
 )
@@ -193,6 +194,20 @@ func downloadPlaylist(ctx context.Context, client *http.Client, parsed *url.URL,
 	}
 
 	// For VOD (Video on Demand), use temp file and convert to MP4
+	// Create a context without deadline for VOD downloads to avoid premature cancellation
+	// Preserve cancellation from parent context but remove any deadline
+	vodCtx, vodCancel := context.WithCancel(context.Background())
+	defer vodCancel()
+
+	// If parent context is cancelled, cancel VOD context too
+	go func() {
+		<-ctx.Done()
+		vodCancel()
+	}()
+
+	// Create a client with longer timeout for VOD segments
+	vodClient := &http.Client{Timeout: vodSegmentTimeout}
+
 	tempTS, err := os.CreateTemp("", "sdl-*.ts")
 	if err != nil {
 		return fmt.Errorf("create temp file: %w", err)
@@ -208,12 +223,13 @@ func downloadPlaylist(ctx context.Context, client *http.Client, parsed *url.URL,
 	fmt.Fprintf(os.Stderr, "Downloading %d segments...\n", totalSegments)
 
 	for i, segment := range segments {
-		if err := downloadSegment(ctx, client, finalURL, segment, tempTS); err != nil {
+		if err := downloadSegment(vodCtx, vodClient, 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)
+		os.Stderr.Sync() // Flush progress output
 	}
 	fmt.Fprintf(os.Stderr, "\n")
 
@@ -223,7 +239,7 @@ func downloadPlaylist(ctx context.Context, client *http.Client, parsed *url.URL,
 
 	mp4Name := ensureMP4Extension(name)
 	fmt.Fprintf(os.Stderr, "Converting to MP4...\n")
-	if err := transmuxToMP4(ctx, tempPath, mp4Name); err != nil {
+	if err := transmuxToMP4(vodCtx, tempPath, mp4Name); err != nil {
 		return err
 	}
 	fmt.Fprintf(os.Stderr, "Complete: %s\n", mp4Name)