The checkmc.sh script prints a list of all the unique multicast MPEG-2 TS streams present on the specified input network interface. It uses tcpdump and that is why it requires to be run from a user with sudo rights.
The `time_out` variable defined at the beginning defines the timeout after which the script will finish listening on the interface. Useful if you don't have any multicast traffic on the port, so you don't need to kill the script The `packets_number` variables defines after how many packets the script to stop listening on the interface. 1000 is a relatively safe value and should not slow down the script, but feel free to experiment with different values.
Usage:
Usage: /home/gstoyanov/scripts/dvb/checkmc.sh -i <IFNAME>
Help: /home/gstoyanov/scripts/dvb/checkmc.sh -h
Example Output:
###########################################################
# List of multicasts present on network interface: 'eno1' #
###########################################################
10.120.160.144.49152 > 232.48.11.16.2000: UDP, length 1316
10.120.244.103.4000 > 232.0.55.4.4000: UDP, length 1316
10.120.246.67.49162 > 232.0.56.3.4000: UDP, length 1316
As you can see from the example in my case all of my present multicasts are SSM (source specific multicasts). You can use smcroutectl join <IFNAME> <Source_IP> <Multicast_IP> to join the source specific multicast. More information of working with multicasts you can find in this wiki page.
The probemc.sh script prints all the existing programs and streams in a UDP MPEG-2 TS multicast. It requires ffprobe, so make sure you have ffmpeg installed before running this script.
Usage:
Usage: probemc.sh -i <input_ts_file>
Usage: probemc.sh -i udp://{IP-Address}:{Port}
-i, --input input file for analysis, it could be recorded TS file or live stream
-h, --help show the help for this program
Example Output:
##############################################
# Statistics for TS: 'udp://232.0.55.4:4000' #
##############################################
Program 5400
service_name : Example TV HD
service_provider: NoProvider
Stream #0:4[0x20](deu): Subtitle: dvb_teletext ([6][0][0][0] / 0x0006), 492x250
Stream #0:6[0xff]: Video: h264 ([27][0][0][0] / 0x001B), none, 50 fps, 50 tbr, 90k tbn
Stream #0:8[0x103](deu): Audio: ac3 ([6][0][0][0] / 0x0006), 48000 Hz, stereo, fltp, 256 kb/s (clean effects)
Stream #0:9[0x105]: Unknown: none ([5][0][0][0] / 0x0005)
Stream #0:10[0x106]: Unknown: none ([11][0][0][0] / 0x000B)
Program 5401
service_name : Example 2 TV HD
service_provider: NoProvider
Stream #0:14[0x21](deu): Subtitle: dvb_teletext ([6][0][0][0] / 0x0006)
Stream #0:18[0x31]: Data: scte_35 (CUEI / 0x49455543)
Stream #0:11[0x1ff]: Video: h264 (High) ([27][0][0][0] / 0x001B), yuv420p(tv, bt709, top first), 1440x1080 [SAR 4:3 DAR 16:9], 25 fps, 50 tbr, 90k tbn, 50 tbc
Stream #0:15[0x203](deu): Audio: ac3 ([6][0][0][0] / 0x0006), 48000 Hz, stereo, fltp, 384 kb/s (clean effects)
Stream #0:19[0x205]: Unknown: none ([5][0][0][0] / 0x0005)