[mythtv-users] External Recorder, PID Cache is Empty

[Marc Rawji]

On Thu, Jul 21, 2016 at 10:13 AM, John P Poet <jppoet at gmail.com> wrote:

> On Thu, Jul 21, 2016 at 10:49 AM Marc Rawji <mrawji at gmail.com> wrote:
>
>>
>> On Tue, Jul 19, 2016 at 4:06 PM, John P Poet <jppoet at gmail.com> wrote:
>>
>>> On Mon, Jul 18, 2016 at 11:37 PM Marc Rawji <mrawji at gmail.com> wrote:
>>>
>>>> Hello,
>>>>
>>>> I am trying to setup en External Recorder. I wrote my own but ran into
>>>> trouble, so I tried using the "mythfilerecorder".
>>>>
>>>> In both cases, I get an error about the PID cache being empty
>>>>
>>>> 2016-07-18 22:11:29.140402 E  DTVChan[1](/usr/bin/mythfilerecorder
>>>> --infile /home/xxx/recorder/out.ts): SetChannelByString(1): PID cache is
>>>> empty
>>>> 2016-07-18 22:11:29.140416 E  TVRec[1]: Failed to set channel to 1.
>>>> Reverting to kState_None
>>>> 2016-07-18 22:11:29.140454 I  TVRec[1]: Changing from WatchingLiveTV to
>>>> None
>>>>
>>>> my out.ts is an mpegts file, according to mythffprobe.
>>>>
>>>> Input #0, mpegts, from 'out.ts':
>>>>   Duration: 00:12:00.78, start: 1.400000, bitrate: 4347 kb/s
>>>>     Stream #0:0[0x100]: Video: h264 (Main), yuv420p, 1280x720 [SAR 1:1
>>>> DAR 16:9], 59.94 fps, 59.94 tbr, 90k tbn, 119.88 tbc
>>>>     Stream #0:1[0x101]: Audio: aac (LC), 48000 Hz, stereo, fltp, 125
>>>> kb/s
>>>>
>>>>
>>>> Channel "1" is mapped to a "No Grabber" source.
>>>>
>>>> I am on ubuntu, running the latest from the PPA,
>>>> so 2:0.28.0+fixes.20160714.04650e0-0ubuntu0mythbuntu2
>>>>
>>>> I poked at the code a little, but I am not sure I understand what the
>>>> PID cache is for... I think it fails to start because of this line:
>>>>
>>>> https://github.com/MythTV/mythtv/blob/4d24d54ef43164f1325fcbe914450b7dea37e28f/mythtv/libs/libmythtv/recorders/dtvchannel.cpp#L343
>>>>
>>>> I'd appreciate any guidance.
>>>>
>>>> Thank you in advance for your help!
>>>>
>>>>
>>> Hi Marc,
>>>
>>> Did you try scanning for channels on that source?  The External Recorder
>>> only works with Transport Stream data (currently) and the process of
>>> scanning for the channels in the TS should get it configured to record.
>>>
>>> John
>>>
>>>
>>
> > Thanks John. I think that fixed it. Now, I just have to get the flow
> control
> > working. :)
> >
> > Is the purpose of the "scan for channels" command to basically get the
> > transport stream and identify the elementary streams within it?
>
> Yes.  For each program in the TS, it will add the information to Myth's
> channel table.
>
> > My recorder has ~50 channels, each channel will create it's own MPEG-TS.
> > Do I have to use different elementary stream numbers if each channel has
> > it's own TS?
>
> That depends on if you are trying to use the same 'source' for all 50
> channels.  If you use separate sources, then they can coexist with the same
> channel number.  However, the result may be difficult to navigate at the UI
> level.  If all 50 channels are defined as being part of the same source,
> then they would need different channel numbers.
>
> You can override what channel number is used (detected), but myth will
> still need a way to uniquely identify and tune each channel.
>
> BTW, Please follow list etiquette and bottom post.
>
>
> John
>
>
>
Got it! Thanks for your help and  apologies for the etiquette breach.
Marc
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