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Support for devices without tuners?

I have an ADSTech Instant VideoMPX which is a USB based video grabber (it supports capturing in MPEG but I dont know if it is in software or hardware). I have connected my STB to its composite in + audio in ports and I can view the video feed using its own application and in VLC also. TVServer detects the device (its at id 4), but gives this error (warning?) when I start the service:

[CODE]2008-12-18 15:59:17.156250 [9]: analog: Problem can't find analog tv tuner[/CODE]

Of course there is no tuner on the device, just the composite, s-video and audio ports. I have added the composite/s-video channels, but when I try to preview something, I get an error that preview couldnt be started because of some unknown error. The following shows up in the logs:

[CODE]2008-12-18 16:01:45.031250 [9]: Controller: StartTimeShifting CVBS#1 on 4 19

2008-12-18 16:01:45.046875 [9]: Controller: find free card for channel CVBS#1 on 4

2008-12-18 16:01:45.531250 [9]: Controller:   got 1 tuning details for CVBS#1 on 4

2008-12-18 16:01:45.546875 [9]: Controller:   channel #1 tv:CVBS#1 on 4 Freq:0 Channel:4 Country:Pakistan Tuner:Cable Video:VideoInput1

2008-12-18 16:01:46.015625 [9]: Controller:    card:1 type:Analog channel not mapped

2008-12-18 16:01:46.031250 [9]: Controller:    card:2 type:Analog channel not mapped

2008-12-18 16:01:46.046875 [9]: Controller:    card:3 type:RadioWebStream cannot tune to channel

2008-12-18 16:01:46.078125 [9]: Controller:    card:4 type:Analog is available priority:1 #users:0 same transponder:False

2008-12-18 16:01:46.078125 [9]: Controller: found 1 available

2008-12-18 16:01:46.109375 [9]: card: CardTune 4 CVBS#1 on 4 akzsf:4:-1

2008-12-18 16:01:46.125000 [9]: card: Tune 4 to CVBS#1 on 4

2008-12-18 16:01:46.125000 [9]: card: user: akzsf:4:-1 tune tv:CVBS#1 on 4 Freq:0 Channel:4 Country:Pakistan Tuner:Cable Video:VideoInput1

2008-12-18 16:01:46.234375 [9]: analog:  Tune:tv:CVBS#1 on 4 Freq:0 Channel:4 Country:Pakistan Tuner:Cable Video:VideoInput1

2008-12-18 16:01:46.250000 [9]: analog: build graph

2008-12-18 16:01:46.250000 [9]: analog: AddTvTunerFilter Instant VideoMPX

2008-12-18 16:01:46.265625 [9]: analog:Dispose()

2008-12-18 16:01:46.281250 [9]: tvcard:FreeAllSubChannels:

2008-12-18 16:01:46.281250 [9]: analog:All filters removed

2008-12-18 16:01:46.281250 [9]: analog: dispose completed

[/CODE]

I have tried it without and with the analog patch but I get the same error  I have also tried it with all the 9 channels (3 CVBS, 3 RGBS and 3 SVHS) but all have the same behavior.  Are such tuner-less devices not supported in TVServer?