bugfix: handle lack of separate audio/video streams

app/main.go

@@ -484,6 +484,16 @@ func fetchAndShowFormats(s *discordgo.Session, i *discordgo.InteractionCreate, u
 	videoMenuOptions := buildVideoMenuOptions(formatOptions.VideoOptions)
 	audioMenuOptions := buildAudioMenuOptions(formatOptions.AudioOptions)
 
+	if len(videoMenuOptions) == 0 || len(audioMenuOptions) == 0 {
+		_, err = s.InteractionResponseEdit(i.Interaction, &discordgo.WebhookEdit{
+			Content: ptr("❌ No separate video/audio streams found for this URL. The source may only provide combined formats."),
+		})
+		if err != nil {
+			log.Printf("Error updating interaction: %v", err)
+		}
+		return
+	}
+
 	setInteractionState(i.Interaction.Token, &InteractionState{
 		URL:           url,
 		FormatOptions: formatOptions,