[mythtv] Assistance debugging a DVB/PMT tuning problem

Tom Dexter digitalaudiorock at gmail.com
Sat Jan 26 00:39:44 UTC 2008


On Jan 24, 2008 11:36 AM, Tom Dexter <digitalaudiorock at gmail.com> wrote:
>
> ---------------------------------------------------------
> Transponder PID-Scan...
> ---------------------------------------------------------
> PID found:    0 (0x0000)  [SECTION: Program Association Table (PAT)]
> PID found:   49 (0x0031)  [PES: ITU-T Rec. H.262 | ISO/IEC 13818-2 or
> ISO/IEC 11172-2 video stream]
> PID found:   52 (0x0034)  [PES: private_stream_1]
> PID found:   58 (0x003a)  [SECTION: ISO/IEC 13818-6 reserved]
> PID found:   74 (0x004a)  [SECTION: ISO/IEC 13818-6 reserved]
> PID found:   81 (0x0051)  [PES: ITU-T Rec. H.262 | ISO/IEC 13818-2 or
> ISO/IEC 11172-2 video stream]
> PID found:   84 (0x0054)  [PES: private_stream_1]
> PID found:   90 (0x005a)  [SECTION: ISO/IEC 13818-6 reserved]
> PID found:   97 (0x0061)  [PES: ITU-T Rec. H.262 | ISO/IEC 13818-2 or
> ISO/IEC 11172-2 video stream]
> PID found:  100 (0x0064)  [PES: private_stream_1]
> PID found:  122 (0x007a)  [SECTION: ISO/IEC 13818-6 reserved]
> PID found: 1034 (0x040a)  [SECTION: ISO/IEC 13818-6 reserved]
> PID found: 1066 (0x042a)  [SECTION: ISO/IEC 13818-6 reserved]
> PID found: 1082 (0x043a)  [SECTION: ISO/IEC 13818-6 reserved]
> PID found: 7424 (0x1d00)  [SECTION: ATSC reserved]
> PID found: 7426 (0x1d02)  [SECTION: ATSC reserved]
> PID found: 7681 (0x1e01)  [SECTION: ATSC reserved]
> PID found: 7682 (0x1e02)  [SECTION: ATSC reserved]
> PID found: 8187 (0x1ffb)  [SECTION: ATSC reserved]
> PID found: 8191 (0x1fff)
>
> That shows no PMT.  Note however that they both have audio and video
> streams at 49 and 52, which is what my dvbscan found, and which works
> in mplayer.  I can't imagine what dvbscan is doing to get that without
> a PMT unless it's just using the first audio and video streams it runs
> into.
>
> The broadcaster certainly appears to be doing something strange though.
>
> Tom
>

Wow...I emailed WNJN this morning to explaining the issue and asking
for a technical contact at WNJB in New Brunswick, NJ.  I suggested
they forward my email to them if possible.

I haven't heard back, so I don't know if it's related, but today they
started sending the PMT and the station tunes in mythtv perfectly.

Thanks a million for the help Janne.  It was actually pretty cool to
learn some stuff I didn't know about MPEG transport streams.  I also
know a lot I didn't about some of those tools...always good to know.

Tom


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