Q. When I scrub In Pro Tools, VVTR doesnt follow.
A. Make sure you have set the following:
A. You probably have the frame rate set differently in Pro Tools and in VirtualVTR. Check the setting in ProTools session setup window and also in the 'Reset Timecode Reference' in VirtualVTR. The same issue applies when you are in slave mode.
A. You may have the 'Send MTC to Port' checked in Pro Tools and feeding VVTR in which case Pro Tools is sending out MTC to Virtual VTR at the same time as VTR is getting MTC from the Video Syncman. You should stop sending MTC from Pro Tools to VVTR when in Timecode Master mode.
A. (OS9) You may have the Mac's RAM Cache set too high. The Default setting for machines with alot of RAM is not good for real time applications. You should set the Ram Cache to 1MB or less in the Memory Control Panel. Note that in some cases, this can cause problems with Digitising, so in general, just experiment with different size caches, large or small. Also see the first question about poor sync
2) Dropping Frames - this occurs when the VirtualVTR Computer subsystem is not performing fast enough to play all frames. In this case, you will see dropped frames in the playback, but you will NOT see the 'Resync LED' light up. At this point you should check everything which affects system performance, try faster (or just different) hard discs, quit all unused apps, extensions etc, check your video monitors (spreading a window across 2 monitors can hurt performance), see the section below covering performance on Digitising - many of the same factors apply
A. Try any / all of the following:
A. This is a common problem with users of Igniter in OSX. It is because you have not set things up correctly (probably selected built-in sound connection for input). Follow the instructions below:
A. Sounds like your system clock on the Pro Tools system isnt right. Make sure that the Sample rate of your session and your sync device (USB, SSD, VSD etc) match, the frame rate matches, and that whatever is providing master sync is present (video, house sync etc). If in doubt set the master clock to internal sync.
A. We have tested the Midisport 2+2 USB with a G4, and we experience a Midi transmission failure every 30 seconds to 1 minute when receiving MTC. This seems to be a bug in the Midisport driver, or a fault with the hardware. The same problem occurs with any software receiving MTC from the Midi sport. Dont use the Midisport 2+2 with VirtualVTR. We have tested the Unitor 8 Mk II (USB) with VirtualVTR with good results, and we recommend this product. Also the Emagic MT4 is recommended.
A. We see this problem only with USB Midi interfaces on the Pro Tools machine. It seems like Pro Tools sends too much midi data for the USB Midi to handle, and it gets buffered up, flowing on even after you release the mouse. The solution is to have a proper Serial Midi interface on the Pro Tools machine (although on some systems you may still see the problem, in which case you should switch to 9-pin instead of MMC). Digidesign are aware of the problem and have fixed in in Pro Tools 6.0.
A. There are 2 possible solutions. 1- you have the 'Online' menu item turned OFF. In this case, VVTR will not chase MTC at all. Turn it back on and all should be well. Alternatively its possible that you have incorrect values in the 'Video Head Disengage Threshold and Max Shuttle Speed parameters. These should both be quite a bit more than 100%, typically several hundred percent, depending on your CPU. Max Shuttle speed is typically double or higher than the Disengage threshold.
A. Some 9-pin controllers are very fussy about how devices behave. You will need to play with the 9-pin preferences in VirtualVTR to find the optimum setup. 9-pin control in OSX is much more responsive and reliable for most situations than OS9. For any kind of complex 9-pin setup, you MUST use OSX. OS9 9-pin is only supported for very simple control from Pro Tools. Contact Gallery for more advice on configuring VirtualVTR with 9-pin for mix stages etc. For the simplest 9-pin implementation, or for complex 9-pin setups with VirtualVTR in OS9, use the Gallery P2Plus hardware interface box, available from our web store, although in most cases this is not necessary, since similar performance can be acheived by setting up the 9-pin parameters in VirtualVTR (OSX) carefully.