Need help with slide (sound/image) lag

[David McFarlane]

Paul,

OK then, your stimulus files certainly are miniscule, so much for that :).

And now I'm pretty much out of ideas.  If it were me, next I would set 
aside the actual experiment program and make a small demo program that 
does nothing but display my slide with my image and sound.  And if I had 
problems there, I would next copy everything to another machine and try 
it all again.  IOW, the old divide-and-conquer strategy.

As far as I can tell your program does nothing extraordinary, so it 
certainly should work.  Good luck.

-- David McFarlane, Professional Faultfinder


> Dear David,
> 
> Yes, thanks a lot for your reply.
> 
>> OK, but how many KB are the sound files?  How many channels (mono or
>> stereo?), how many samples/sec, and how many bits/sample?
> 
> The sounds are usually very short, with a size of about 25 KB to 55
> KB. They are recorded in only one channel; the sampling frequency is
> 22050Hz, 16bits per sample.
> 
>> Also, how many KB is your fixation .jpg file?  What is its resolution
>> (pixels width and height), its color bit depth, and its compression ratio?
>> And why use a .jpg for the fixation instead of just a text "+"?
> 
> The size of the jpg file is less than 1 KB. Its resolution is 44 by 44
> pixiels (72dpi); the color bit depth is 24. (I'm sorry for now I don't
> know how to check out the compression ratio on my computer, but when I
> made it I guess I set it to the highest quality.) But in the slide
> object I used the strech function to make it fill up the whole screen.
> 
> Still, I tried not to use a fixation jpg but simply a text "+", but
> the slide still lags.
> 
> Yes, I used EP2 on my vista before, and I did not know why I
> frequently got timeout errors until I checked the discussions here.
> 
> Thank you for your help!
> Paul

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