ffmpeg_command = [
                                        "ffmpeg", "-loglevel", "info",
                                        "-rw_timeout", "15000000",
                                        "-reconnect", "1", "-reconnect_at_eof", "1", "-reconnect_streamed", "1",
                                        "-reconnect_delay_max", "15",
                                        "-fflags", "+genpts+discardcorrupt",
                                        "-err_detect", "ignore_err",
                                        "-thread_queue_size", "8192",
                                        "-headers", douyin_headers,
                                        "-i", real_url,
                                        "-vf", "scale=720:1280:force_original_aspect_ratio=decrease,pad=720:1280:(ow-iw)/2:(oh-ih)/2:black",
                                        "-c:v", codec_v, "-preset", preset_v, *tune_param,
                                        "-b:v", "2500k", "-maxrate", "2500k", "-bufsize", "5000k",
                                        "-g", "50", "-r", "25", "-pix_fmt", "yuv420p",
                                        "-c:a", "aac", "-b:a", "128k", "-ar", "44100", "-ac", "2",
                                        "-af", "aresample=async=1:first_pts=0",
                                        "-flags", "+global_header",
                                        "-f", "flv", youtube_rtmp
                                        # "-f", "tee",
                                        # "-map", "0:v", "-map", "0:a",
                                        # tee_outputs
                                    ]