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

[watch_the_rain]

Thanks for your answer.My boss have changed a data packet to test.
But a software my company used to test the TS stream can parse out all the events from the discontinuous packets,why can't the libdvbpsi do this?

在 2013-08-15 14:57:37，"Jean-Paul Saman" <jpsaman at videolan.org> 写道：

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 highfrequency 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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