[mythtv-users] No sound after channel change with Pinnacle PCTV USB2 tuner

José Silva jsantossilva at hotmail.com
Wed Nov 23 01:36:36 UTC 2011

On 23-11-2011 00:59, Raymond Wagner wrote:
> On 11/22/2011 19:28, José Silva wrote:
>> Nonetheless, something still puzzles me: the MPEG chip encodes the
>> video, right?
>> But my problem is with audio, and not always. The proof that mythtv is
>> able to make it, is that it does every first time; and then the code
>> disobeys its mentor:)
> Some encoder devices like the old Plextor recorders did only do video.
> MythTV would have to independently capture, encode, and multiplex the
> audio with an elementary video stream coming out of the device.  The
> IVTV devices like the PVR-USB2, and internal PVR-150 and HVR-1600, do
> both audio and video.  The encoder chip encodes to MPEG2 audio and
> video, multiplexed into an MPEG program stream, which it outputs
> straight out of the /dev/video0 device node.  You can concatenate that
> device into a file, and play it with any software than can handle MPEG
> video.

I'm sorry to insist but I still don't understand that I need an encoder 
chip to be able to have audio after the channel changes, because mythtv 
didn't need it before the channel change, the audio was perfect, the 
software encoding works as needed.

I'm sure your advice to change my tuner works. As much as trashing a car 
with a flat tyre and buying a new one, but that's not what I asked for.

To make it clearer, if someone told me: "mythtv doesn't work with analog 
tuners that don't have an encoder chip" (as tvheadend does), then I 
would happily trash my tuner, or save it for tvtime.

But this is not the case, mythtv does work with my tuner, but only once 
each time. And that's what I asked for help to solve, that is my question.

You can also say that this is a code glitch that isn't worth to look 
because nobody uses those tuners these days; I accept that but then, I 
think the dev should block the code in order to not let a good 
application have dark alleys.

To finish, thank you again for the time you have spent with this issue 
and please don't take me harsh, I hate to trash things.

keep well,

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