[dvblast-devel] TS discontinuity on multiple dvblast instances

[Davor Spasoski]

Hi,

I'm having a problem with dvblast with more than one instance running.

My environment is:

-          SLES11 running on SUN AMD x86 server with 4 cores, 1Gb NICs, plenty of RAM. alternatively I test with a dual core Intel PC with same results

-          I use IP (UDP) MPTS sources from DVB-T headend, directly from production switches. The same sources feed the transmitters country-wide. The bitrate of the source is 27 mbit/s per MUX. At the moment I'm using clear only (unencrypted) muxes.

-          I filter up to 4 SIDs from the input MUX using the following configuration files
mux1.conf
224.10.3.1:5004 at 10.146.16.86 1 611
224.10.3.2:5004 at 10.146.16.86 1 612

mux8.conf
224.10.3.19:5004 at 10.146.16.86 1 1312
224.10.3.16:5004 at 10.146.16.86 1 1314
224.10.3.17:5004 at 10.146.16.86 1 1311
224.10.3.18:5004 at 10.146.16.86 1 1313

Problem description:

I start with a single instance of dvblast like:
dvblast  -D @239.3.1.13:5500/udp/ifaddr=10.0.33.5 -b 8 -l -g ip2ip_dvb_gw-D8 -c /home/user/mux8.conf

CPU reading is:
Cpu(s):  0.4%us,  0.7%sy,  0.0%ni, 98.0%id,  0.1%wa,  0.0%hi,  0.8%si,  0.0%st
load average:
0.12, 0.56, 1.29

This is usually working pretty stable. But if I run a second or nth instance od dvblast, for example:
dvblast -D @239.3.1.6:5500/udp/ifaddr=10.0.33.5 -b 8 -l -g ip2ip_dvb_gw-D1 -c /home/use/mux1.conf

after a short while I get a flood of discontinuity errors in the log, CPU utilization of dvblast remains same, but overal the wa counter (waiting for io) jumps to around 25% and consequently the load increases dramatically (enough to saturate the PC)

Cpu(s):  0.0%us,  0.5%sy,  0.0%ni, 74.7%id, 24.7%wa,  0.0%hi,  0.1%si,  0.0%st
load average: 1.75, 1.17, 1.21

We tested the sources with TS analyser on the same connection and there wasn't a single continuity error in 24 hourse. Otherwise it would have been visible on STBs country-wide.

It is worth noting that sometimes the problem appears with a single instance of dvblast.

I tried with or without -u switch but nothing helps.

Any ideas?




Jun 10 12:10:17 srd2 ip2ip_dvb_gw-D8[4548]: warning: TS discontinuity on pid 5931 expected_cc 15 got 11 (H.264/14496-10 video (MPEG-4/AVC), sid 1313)
Jun 10 12:10:17 srd2 ip2ip_dvb_gw-D1[4549]: warning: TS discontinuity on pid 5052 expected_cc  5 got  7 (13818-3 audio (MPEG-2), sid 605)
Jun 10 12:10:17 srd2 ip2ip_dvb_gw-D8[4548]: warning: TS discontinuity on pid 5031 expected_cc  6 got 14 (H.264/14496-10 video (MPEG-4/AVC), sid 1303)
Jun 10 12:10:17 srd2 ip2ip_dvb_gw-D8[4548]: warning: TS discontinuity on pid 5012 expected_cc  5 got 13 (13818-3 audio (MPEG-2), sid 1301)
Jun 10 12:10:17 srd2 ip2ip_dvb_gw-D8[4548]: warning: TS discontinuity on pid 5042 expected_cc  9 got  7 (13818-3 audio (MPEG-2), sid 1304)
Jun 10 12:10:17 srd2 ip2ip_dvb_gw-D1[4549]: warning: TS discontinuity on pid 5521 expected_cc 10 got  5 (H.264/14496-10 video (MPEG-4/AVC), sid 612)
Jun 10 12:10:17 srd2 ip2ip_dvb_gw-D1[4549]: warning: TS discontinuity on pid 5211 expected_cc  7 got 14 (H.264/14496-10 video (MPEG-4/AVC), sid 611)

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