«

"Argo22" wrote ...
>I was given a used Panasonic WJ-MX12 switcher for doing some multi-
> camera live webcasts. I thought it would be ok given it was free, plus
> i thought i would be able to hook up a cheap video selector switch to
> one of the sources and not have a problem. The problem is that when i
> switch on the selector box, the video glitches even if it's source
> isn't in program.

Depends on how your cheap video selector switch works.
I used to do exactly this hack with a WJ-AVE5 and got away
with it. But the 12 may behave differently in how it decides
which input to sync to.

> Just wondering if an active/powered switcher
> connected to the wj-mx12 would solve the problem? I have seen a few
> active switchers on ebay (panasonic WJ-220) which do not have a glitch
> supposedly.

The only way it might not have a glitch is if all the sources are
already genlocked together. You didn't mention whether you
are running synchronous sources, or random unlocked cameras?

> Any recommendations? This will only be for the short term as well. We
> will be putting more money into gear as soon as we see how successful
> they are. Don't want to spend the bucks to find out it will be a flop

Not enough info?

"Argo22" <(E-Mail Removed)> wrote in message
news:d1c60a2b-74d8-4b95-80f3-(E-Mail Removed)...
>
> Apparently the WJ-MX12 has a frame synchronizer and not a TBC as some
> mixers do like the Videonics MX-1 and MX-Pro. I have 2 cameras that
> are random unlocked and using the internal sync from the mixer. I have
> a passive ("bang box" some have referred to) switcher from radio shack
> that i tried and that produces the glitch over all sources. I have
> acquired a panasonic WJ-220 from a friend and will try that. He think
> it will since the source is switched using vertical interval and
> should not glitch.
>
> Thanks
> Mark
>
I think you may find that they all have built-in frame syncs. AFAIK a TBC
is only capable of doing limited time base error correction for sources
that are already synced together. Early TBCs could only do a few lines,
while some of the later units could handle a full field at a time. For the
last couple decades, most of these devices have been full frame syncs
and are capable of handling a free wheeling video input and lock it to a
reference sync signal. The only TBCs I've seen for quite a while have
been built right into video tape recorders and players.

I have not used many of the Panasonic prosumer level switchers. The units
of this type that I have used that have multiple inputs will glitch if you
switch
the input of the input that is being used as a reference. If you switch to
the
channel that is being used as a reference, then you can select a new device
on the other input and then switch or dissolve through to that new input.
However, you can't make another input selection until you switch back to
the referenced input before making the new selection.

David

"Alan S." <(E-Mail Removed)> wrote in
news:Xns9C756299E3131usenetnojunkaspal@216.196.109 .145:

> "David McCall" <(E-Mail Removed)> wrote in
> news:h77ed1$ehq$(E-Mail Removed):
>
>>
>> "Argo22" <(E-Mail Removed)> wrote in message
>> news:d1c60a2b-74d8-4b95-80f3-d0bbf4138ca0
> @s13g2000yql.googlegroups.com.
>> ..
>>>
>>> Apparently the WJ-MX12 has a frame synchronizer and not a TBC as
>>> some mixers do like the Videonics MX-1 and MX-Pro. I have 2
>>> cameras that are random unlocked and using the internal sync
>>> from the mixer. I have a passive ("bang box" some have referred
>>> to) switcher from radio shack that i tried and that produces the
>>> glitch over all sources. I have acquired a panasonic WJ-220 from
>>> a friend and will try that. He think it will since the source is
>>> switched using vertical interval and should not glitch.
>>>
>>> Thanks
>>> Mark
>>>
>> I think you may find that they all have built-in frame syncs.
>> AFAIK a TBC is only capable of doing limited time base error
>> correction for sources that are already synced together. Early
>> TBCs could only do a few lines, while some of the later units
>> could handle a full field at a time. For the last couple decades,
>> most of these devices have been full frame syncs and are capable
>> of handling a free wheeling video input and lock it to a
>> reference sync signal. The only TBCs I've seen for quite a while
>> have been built right into video tape recorders and players.
>>
>> I have not used many of the Panasonic prosumer level switchers.
>> The units of this type that I have used that have multiple inputs
>> will glitch if you switch
>> the input of the input that is being used as a reference. If you
>> switch to the
>> channel that is being used as a reference, then you can select a
>> new device on the other input and then switch or dissolve through
>> to that new input. However, you can't make another input
>> selection until you switch back to the referenced input before
>> making the new selection.
>>
>> David
>>
>>
>>
>>
>
> I had an MX12 a (long) time ago so this is from very vague memory.
> Have you tried swappinng the inputs over? Some of the MX range use
> one of the inputs as a sync reference, running free when there is
> no input. If your bang box was plugged to the channel used as a
> reference then the o/p would glitch when turned on. Try using a
> _solid_ source i.e a camera in the reference input.
>
> I'm sorry if I'm barking up the wrong tree, I moved up the MX
> range and may be thinking of a later model.
>
> Alan S.
>
Your memory is pretty good Alan. The MX-12 and the MX-10 that
preceeded it use the video 2 input as reference.

David, connect your switchbox to the video1 input.


--
Bob Quintal

PA is y I've altered my email address.