Adjusting Recording Correction Values

DVgate Motion enables you to record video files stored in your hard disk on tape set in a DV device connected to your computer(in [EXPORT-Auto] mode).
However, to ensure accuracy in the recording, you have to specify recording correction values. Recording correction values are the fine adjustments of the recording initiation and termination timing when recording video on a DV device.
The following are some of the problems you may encounter if the correction values of the recording timing are incorrect:

• The beginning of the image you want to record is not recorded or frames are duplicated.
  
• The end of the image you want to record is not recorded or frames are duplicated.
  
• The image is recorded correctly, but the beginning of the sequence is incorrectly set either forward or backward.
  

Adjustment of the recording correction values is especially important when performing splice recording (recording of sequential video clips on the same tape).

You can choose to specify the values yourself or to have the values automatically adjusted by using the automatic calibration feature. The values generated by the automatic calibration feature are usually appropriate.

Setting the Recording Correction Values

1. Click on the Mode Selector List and select [EXPORT-Auto].
   
2. Choose [Settings]-[Adjust on Recording...].
   
   The [Adjust on Recording] dialog box appears.
   
3. Click [AutoAdjust...].
   
   DVgate Motion activates the connected DV device and automatically finds the adjustment values.
   Please refer to [Setting the Recording Correction Values Manually] for manual configuration of the recording correction values.

   Note

   • Test signals produced by the automatic calibration feature to obtain correction values are recorded on the tape. Insert a tape that you do not mind recording the test signal on when using this feature.
     
   • When you click [Cancel] while automatic calibration is in progress, a certain amount of time is required before operation stops.
     
   • Perfect splice recording with a +/-0 frame cannot be accomplished since there are always errors associated with the accuracy of the DV device or the condition of the DV tape.
     
4. Click [OK] when automatic calibration terminates.
   
   The adjustment values shown in the dialog box are saved so that they can be reflected in recording on the DV device. The dialog box closes.

   Hint

   The adjusted values are not changed when you click [Cancel].
   

Setting the Recording Correction Values Manually

The automatic calibration feature usually generates the optimal values.
However, if you find that there are missing or duplicate frames at the beginning or end of the video sequences you are trying to record, try adjusting the values manually.

• Missing frames at the beginning of the video sequence
  
• Duplicate frames at the beginning of the video sequence
  

Adjust the [Delay] setting when either of the above occurs.
[Delay] is used to adjust the time of sending data from DVgate Motion to the time at which the DV device actually records the data.
The higher the number, the longer DVgate Motion waits before sending the data.
Increase the value if there are missing frames at the beginning of the video sequence you are recording.
Conversely, decrease the value if duplicate frames appear before the beginning of the recorded video sequence.

• Missing frames at the end of the video sequence
  
• There are more blank frames at the end of the video sequence than have been set.
  

Adjust the [RecStop] setting when either of the above occurs.
[RecStop] is used to synchronize the end of data sent from DVgate Motion to the time that the DV device actually stops recording.
The smaller the number, the sooner the sending of data ends.
Decrease the value if there are missing frames at the end of the video sequence you are recording.
Conversely, increase the value if there are more blank frames at the end of the video sequence than have been set.

• Recording starts before the specified tape position
  
• Recording starts after the specified tape position
  

Adjust the [Adjust] setting when either of the above occurs. DV devices always pre-roll the tape (rewinds the tape slightly) when it enters into the recording mode. Therefore, even if you rewind the tape to the correct recording start position using DVgate Motion's device control buttons, you might find that the video sequence gets recorded before the specified start position.
[Preroll] is used to correct this shift in the recording start position in the forward direction.
The higher the number, the more the specified position is shifted forward.
Increase the value if recording starts before the specified recording start position.
Conversely, decrease the value if recording starts after the specified recording start position.
You can enter any positive integer greater than zero. However, the maximum number you can enter depends on the individual DV device. When using a DV device for the first time with DVgate Motion, click the [AutoAdjust...] button so that the optimal correction value is detected. If you attempt to enter a value that exceeds the maximum value accepted by the DV device, a message will appear informing you of the problem.

Note