[libdvbpsi-devel] Can the EIT decoder decode successfully when the TS packet is not continued?

[Jean-Paul Saman]

HI,


On Thu, Aug 15, 2013 at 5:22 AM, watch_the_rain <watch_the_rain at 163.com>wrote:

> Today I found that the the progam did not find the event schedule
> information in the EIT table when I decode a new TS stream, but It works
> well with the old stream. (The verison of the library I used was v 0.1.6.)
> Then I tryed with the latest version(v1.1.0), the result iwas a little
> better,14 events in the event schedule table were found.
> The debug error infromation was printf like this:
>      TS discontinuity (received 6, expected 5) for PID 18
>      TS discontinuity (received 0, expected 15) for PID 18
>      TS discontinuity (received 0, expected 15) for PID 18
>      ............
> So I printed the continuity counter number in the ts paket I before pushed
> to the EIT decoder,It showed text below (just a small fraction):
>      continuity_counter:0
>      continuity_counter:1
>      continuity_counter:2
>      continuity_counter:4
>      libdvbpsi error (PSI decoder): TS discontinuity (received 4, expected
> 3) for PID 18
>      continuity_counter:5
>      libdvbpsi debug (EIT decoder): Table version 11, i_table_id 80,
> i_extension     1, section   0 up to 248, current 1
>      continuity_counter:6
>      continuity_counter:9
>      libdvbpsi error (PSI decoder): TS discontinuity (received 9, expected
> 7) for PID 18
>     continuity_counter:11
>     libdvbpsi error (PSI decoder): TS discontinuity (received 11, expected
> 10) for PID 18
>     continuity_counter:12
>     libdvbpsi debug (EIT decoder): Table version 11, i_table_id 80,
> i_extension     3, section   8 up to 248, current 1
>     continuity_counter:13
>     continuity_counter:14
>     continuity_counter:0
>     libdvbpsi error (PSI decoder): TS discontinuity (received 0, expected
> 15) for PID 18
>     .........
> A “continuity_counter:  xx” means pushing a packet to EIT decoder once.
> There were an average of one error message every 6 packets. The packets
> missed were lost in the transport.
> Is the high frequency of discontinuity that made the decoder failed? And
> I think that the packet loss is too hight in the ts transport, but the superior
> don't think so. What do you think?
> I'm sorry my English was not good, there must be some error in the email.
> Please help me, thanks very much!
>
>
In the example log above you lost 5 packets out of 15, which is one third
!!!

You have massive loss of packets and thus you miss information form the EIT
tables.

First fix the reason for the packet loss, then test the EIT again.


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Kind regards,

Jean-Paul Saman
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