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is there a way to define a variable such that the cell offset is automatically generated based on the next cell onset?e.g., a new onset generate the previous cell's offset by substracting 1ms to the newly defined onset

this would be the case if, while coding a particular variable (e.g. variable= looking, argument= center or away), the offset of an argument is immediatly followed by the onset of the next argument e.g., the end of a "center" look is followed immediatly by an "away" look (at any one point the child can only be looking away or center)

right now, i seem to have 2 options to indicate the offset based on a coming onset:

1) find the onset of a new look, jog back once and mark the offset of the current problem: there is a short period where no look was recorded. e.g., knowing that the onset of the next look is 00:01:48:766, 1 back-jog brings me to 00:001:48:732 as the offset of the current look, thus the period between 00:01:48:732 and 00:01:48:766 (34ms) has no "looking argument" recorded.

2) find the onset of a new look, then manually enter the offset of the current look as time time stamp of the next onset minus 1ms e.g., knowing that the onset of the next look is 00:01:48:766, i can manually enter the cell offset as 00:01:48:765

problem: need to go back and forth between keypad, keyboard and mouse. slows down coding considerably.

asked 22 Sep '11, 13:35

Clinton's gravatar image

Clinton
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accept rate: 36%

edited 22 Sep '11, 13:36


automatic offsets are currently supported within OpenSHAPA. However it assumes you are coding in passes - that is to say, you are looking for events in a single column before moving on and coding another kind of event in a separate column.

When creating cells for a particular column (i.e. variable= looking, argument= center or away in your example) if you use the numpad '0' or create new cell and set onset button. It will automatically create a cell with the onset of the current video time.

i.e. If the current video time is '00:00:05:000' the new cell will have: Cell = 1 Onset = 00:00:05:000 Offset = 00:00:00:000

If you play a bit further into the video say to '00:00:06:000' and use numpad '0' again to create another cell, it will automatically update the offset of the previous cell, i.e.

Cell = 1 Onset = 00:00:05:000 Offset = 00:00:05:999

Cell = 2 Onset = 00:00:06:000 Offset = 00:00:00:000

The automatic update of the previous cell's offset will only occur when the offset is all zero. If you edit the offset to be some other value (say 00:00:05:450) using numpad '0' to create a new cell will only set the onset of new cell. i.e.

Cell = 1 Onset = 00:00:05:000 Offset = 00:00:05:450

Cell = 2 Onset = 00:00:06:000 Offset = 00:00:00:000

Hope this answer helps you out a bit, and sorry again for the delay.

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answered 22 Sep '11, 13:36

Clinton's gravatar image

Clinton
111171924
accept rate: 36%

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question asked: 22 Sep '11, 13:35

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last updated: 22 Sep '11, 13:36

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