Description of the problem: when presenting a loop of a routine (comprising a fixation cross for 1.5 seconds, a movie and a sound component) the very first trial completely fails the timing: the fix cross is way to long and the sound is cut at the end. The second trial works fine but I really would like to figure out what is happening here.
First, I used frames as duration for the fixation cross, but it didn’t work (the fix cross actually stayed on for the whole time, without moving on with the movie component), so I switched to duration in seconds. However, since the timing between Movie and Sound is essential, I set the timing of both components to frames. Maybe this is important to know when looking for a solution…
I build a very simplified version of the actual experiement to test the timing that looks like this:
Note that the first fixation stimulus is actually quite long…
…while the second one is 1.5 seconds (correct duration)
The sound is also really weird during the first trial, but fine in the second one (see mic recording)
Thanks in advance for your help!