Live TV Fails to switch to Analog tuner after digital tuner used

[cube1@…]

Capture Card: Hauppauge HVR-2250

Something which (with some fussing) worked OK under mythtv 0.25 is failing under 0.27 (mythbuntu 12.04.3, then upgraded to MythTV 0.27)

That it worked under MythTV 0.25 should deal with questions such as whether I have the right firmware, drivrs, etc. (I hope)

If I have a configuration with a single analog tuner, it works fine. If I have a configuration with a single digital tuner, it works fine.

If I have a configuration with both (whether I point them at the same tuner of the two on this card, or use different ones), I can tune analog OK the first time, but once I have tuned to a digital station, if I then go back and try to tune on the analog tuner, the front end goes black, and then eventually responds with a message which is approximately (sorry, but it is a real hassle to recreate the message yet again) "No A/V Decoder". It appears that in these cases the live TV ring buffer file does not get created on the backend.

The digital side is set to No EIT and open on demand (that was necessary to make it work OK under 0.25, and seems to still be necessary under 0.27, or ones gets a "blue screen")

The message in the frontend log reads:

CoreContext? ringbuffer.cpp:1035 (WaitForReadsAllowed?) RingBuf?(/video1/livetv/5005_20131127225009.mpg): Taking too long to be allowed to read.. Nov 27 16:50:11 mythfrontend.real: last message repeated 5 times Nov 27 16:50:11 mythtemp mythfrontend.real: mythfrontend[5223]: E CoreContext? mythplayer.cpp:963 (OpenFile?) Player(0): Couldn't find an A/V decoder for: '/video1/livetv/5005_20131127225009.mpg' Nov 27 16:50:11 mythtemp mythfrontend.real: mythfrontend[5223]: E CoreContext? mythplayer.cpp:2768 (StartPlaying?) Player(0): Unable to open video file.

The backend log from the same timeframe reds

channame(WMTV) startts(Wed Nov 27 22:30:00 2013) endts(Wed Nov 27 23:00:00 2013)#012 recstartts(Wed Nov 27 22:50:08 2013) recendts(Wed Nov 27 23:00:00 2013)#012 title(Jeopardy!)): recording already exists... Nov 27 16:50:11 mythtemp mythbackend: mythbackend[5193]: W DeviceReadBuffer? recorders/DeviceReadBuffer.cpp:555 (Poll) DevRdB(/dev/video0): Poll took an unusually long time 2502 ms Nov 27 16:50:11 mythtemp mythbackend: mythbackend[5193]: I TVRecEvent tv_rec.cpp:1048 (HandleStateChange?) TVRec[9]: Changing from WatchingLiveTV to None

(More of log attached as file)

At the very least, the message from the front-end is misrepresenting the problem.

[cube1@…]

MythTV Backend Log around time of error.

[cube1@…]

mytbackend --version output

[cube1@…]

MythTV Front End Log around the time of the error

[cube1@…]

mythfrontend --version output

[cube1@…]

Was working with this and that, trying to find a workaround, and in the process regenerated the front end message, which is, to be precise, "Could not find an A/V decoder".

[kb9vqf@…]

I am seeing this exact problem on a pair of Hauppauge analog/digital tuners with myth0.27-fixes. In my case, however, the frontend crashes most of the time instead of returning with an error message.

[paulh]

Duplicate of #11961