Mailing List Archive: Switching between backends?

Switching between backends?

Apr 19, 2003, 8:35 PM

Post #1 of 5 (1666 views)

I have 2 backend servers. One of them (the master) has a WinTV-Go tuner
card with a full lineup of channels and the slave has a bt848 capture
card, with a single channel. Is there any way to select which backend I
get when I start a frontend? For the first frontend it will always go
to the master server and then the next frontend will get the slave
server with a single channel. If there is not already a frontend
watching TV, the only way I can access the slave backend is if I
schedule a recording on the slave, then watch the recording. There
seems to be no way to switch between backends.

Also, is there a way to set different encoding parameters for each
backend? My slave backend has less power, and I would like to use more
conservative settings for it, both for live TV and recordings. All my
recordings get generated with a recording profile of 0, do I have the
means to change in the interface or must I manually change it in the DB?
How does the backend decide which recording profile to use for Live
TV-does it simply look for the name or does it have a hard coded ID?

Re: Switching between backends? [ In reply to ]

acs at hourglassone

Apr 20, 2003, 1:12 PM

Post #2 of 5 (1616 views)

Permalink

Should be pretty easy to write a shell script that updates the db with the
proper backend server b4 running the frontend.

My 2 bits worth :)
Aaron

On Sat, 19 Apr 2003, Eni Gma wrote:

> I have 2 backend servers. One of them (the master) has a WinTV-Go tuner
> card with a full lineup of channels and the slave has a bt848 capture
> card, with a single channel. Is there any way to select which backend I
> get when I start a frontend? For the first frontend it will always go
> to the master server and then the next frontend will get the slave
> server with a single channel. If there is not already a frontend
> watching TV, the only way I can access the slave backend is if I
> schedule a recording on the slave, then watch the recording. There
> seems to be no way to switch between backends.
>
> Also, is there a way to set different encoding parameters for each
> backend? My slave backend has less power, and I would like to use more
> conservative settings for it, both for live TV and recordings. All my
> recordings get generated with a recording profile of 0, do I have the
> means to change in the interface or must I manually change it in the DB?
> How does the backend decide which recording profile to use for Live
> TV-does it simply look for the name or does it have a hard coded ID?
>
> _______________________________________________
> mythtv-users mailing list
> mythtv-users@snowman.net
> http://lists.snowman.net/cgi-bin/mailman/listinfo/mythtv-users
>

Re: Switching between backends? [ In reply to ]

enigma at thedonnerparty

Apr 20, 2003, 9:12 PM

Post #3 of 5 (1626 views)

Permalink

Yeah, but updates what? It it OK to switch the master backend to a
different server then switch it back? I seem to remember there are
several tables that are keyed on server name, I fear that it may cause
problems in those tables if I keep switching which backend is the
master. For now I guess I'll just keep the master I have and record
anything I want to watch on the slave backend.

Thanks for the reply.

pixel@hourglassone.com wrote:

>Should be pretty easy to write a shell script that updates the db with the
>proper backend server b4 running the frontend.
>
>My 2 bits worth :)
>Aaron
>
>On Sat, 19 Apr 2003, Eni Gma wrote:
>
>
>
>>I have 2 backend servers. One of them (the master) has a WinTV-Go tuner
>>card with a full lineup of channels and the slave has a bt848 capture
>>card, with a single channel. Is there any way to select which backend I
>>get when I start a frontend? For the first frontend it will always go
>>to the master server and then the next frontend will get the slave
>>server with a single channel. If there is not already a frontend
>>watching TV, the only way I can access the slave backend is if I
>>schedule a recording on the slave, then watch the recording. There
>>seems to be no way to switch between backends.
>>
>>Also, is there a way to set different encoding parameters for each
>>backend? My slave backend has less power, and I would like to use more
>>conservative settings for it, both for live TV and recordings. All my
>>recordings get generated with a recording profile of 0, do I have the
>>means to change in the interface or must I manually change it in the DB?
>> How does the backend decide which recording profile to use for Live
>>TV-does it simply look for the name or does it have a hard coded ID?
>>
>>_______________________________________________
>>mythtv-users mailing list
>>mythtv-users@snowman.net
>>http://lists.snowman.net/cgi-bin/mailman/listinfo/mythtv-users
>>
>>
>>
>
>_______________________________________________
>mythtv-users mailing list
>mythtv-users@snowman.net
>http://lists.snowman.net/cgi-bin/mailman/listinfo/mythtv-users
>
>

Re: Switching between backends? [ In reply to ]

acs at hourglassone

Apr 20, 2003, 11:30 PM

Post #4 of 5 (1627 views)

Permalink

I'm not entirely certain, but natural assumption would be that the tables
keyed off server are specific to mythbackend, not mythfrontend (I do
remember seeing the name of the backend server as a pref in the db,
however).

Anyone care to back me up on this/confirm?

Aaron

On Sun, 20 Apr 2003, Eni Gma wrote:

> Yeah, but updates what? It it OK to switch the master backend to a
> different server then switch it back? I seem to remember there are
> several tables that are keyed on server name, I fear that it may cause
> problems in those tables if I keep switching which backend is the
> master. For now I guess I'll just keep the master I have and record
> anything I want to watch on the slave backend.
>
> Thanks for the reply.
>
>
>
> pixel@hourglassone.com wrote:
>
> >Should be pretty easy to write a shell script that updates the db with the
> >proper backend server b4 running the frontend.
> >
> >My 2 bits worth :)
> >Aaron
> >
> >On Sat, 19 Apr 2003, Eni Gma wrote:
> >
> >
> >
> >>I have 2 backend servers. One of them (the master) has a WinTV-Go tuner
> >>card with a full lineup of channels and the slave has a bt848 capture
> >>card, with a single channel. Is there any way to select which backend I
> >>get when I start a frontend? For the first frontend it will always go
> >>to the master server and then the next frontend will get the slave
> >>server with a single channel. If there is not already a frontend
> >>watching TV, the only way I can access the slave backend is if I
> >>schedule a recording on the slave, then watch the recording. There
> >>seems to be no way to switch between backends.
> >>
> >>Also, is there a way to set different encoding parameters for each
> >>backend? My slave backend has less power, and I would like to use more
> >>conservative settings for it, both for live TV and recordings. All my
> >>recordings get generated with a recording profile of 0, do I have the
> >>means to change in the interface or must I manually change it in the DB?
> >> How does the backend decide which recording profile to use for Live
> >>TV-does it simply look for the name or does it have a hard coded ID?
> >>
> >>_______________________________________________
> >>mythtv-users mailing list
> >>mythtv-users@snowman.net
> >>http://lists.snowman.net/cgi-bin/mailman/listinfo/mythtv-users
> >>
> >>
> >>
> >
> >_______________________________________________
> >mythtv-users mailing list
> >mythtv-users@snowman.net
> >http://lists.snowman.net/cgi-bin/mailman/listinfo/mythtv-users
> >
> >
>
>
>

Re: Switching between backends? [ In reply to ]

enigma at thedonnerparty

Apr 21, 2003, 8:11 PM

Post #5 of 5 (1635 views)

Permalink

Eni Gma wrote:

> I have 2 backend servers. One of them (the master) has a WinTV-Go
> tuner card with a full lineup of channels and the slave has a bt848
> capture card, with a single channel. Is there any way to select which
> backend I get when I start a frontend? For the first frontend it will
> always go to the master server and then the next frontend will get the
> slave server with a single channel. If there is not already a
> frontend watching TV, the only way I can access the slave backend is
> if I schedule a recording on the slave, then watch the recording.
> There seems to be no way to switch between backends.
>
> Also, is there a way to set different encoding parameters for each
> backend? My slave backend has less power, and I would like to use
> more conservative settings for it, both for live TV and recordings.
> All my recordings get generated with a recording profile of 0, do I
> have the means to change in the interface or must I manually change it
> in the DB? How does the backend decide which recording profile to use
> for Live TV-does it simply look for the name or does it have a hard
> coded ID?
>

For the latter problem, I ended up changing the source code on the slave
to use the "Live TV2" profile rather than "Live TV" and it is working
like a charm. I will probably eventually change it to load which
profile to use for Live TV from the settings table. I would imagine
this capability is already under development (I seem to remember
something about a per-recording profile setting, I would imagine this
goes hand-in-hand with that) so I doubt I will go very far with it.
Next up will be seamless (yeah, right ;-}) switching between backends
while I switch channels.

p.s. On a related note, it is a bad idea to change the name of the
"Default" profile. If the application does not find the profile, you
can't change what settings to use for recording without a manual DB
update. I found out the hard way :)