Drop frame rate when start saving avi file with GigE basler camera

Hello all,
I use 2 Ace basler GigE cameras at 60 fps to capture animal locomotion. I experience randomly this kind of problem. When I start to record by a start/stop button and save the videos in the hard-disk sometime the frame rate drop to 20-14 fps and a skip 2 or 3 frame. After that the frame rate became stable to 60 fps.
These are the overall settings and spec of the program:
- I use a producer/consumer loop (I never experienced a filling of the queue even when the drop frame rate occur)
- I fixed the bandwidth of the Intel 100 GigE card to 500 for each camera
- size of packet sent = 8000
- firewall disabled
- vi execution in highest mode
I observed that the dropping of the frame rate occur when the vi run for a while without interaction with the operator (the operator set others parameters in another computer, so the vi only acquire the videos without saving them)
I have attached the vi
Thank you for your help
Alex
Solved!
Go to Solution.
Attachments:
GRAB 2 CAM SAVE AVI TTL SEND C-P LOOP 0.1.vi ‏151 KB

Alex,
Does this drop in frame rate occur with both cameras or does it only occur with the "left" or "right" camera acquisition loops. I think what is happening is that your producer loop is overwriting the images before they get written to the AVI. In addition there may be some memory conflicts as queues are generally not recommended for IMAQ Images. Here is an explanation stating that instead of enqueuing an Image Object you are actually enqueuing a memory location to an image. This means that when you produce a new image it is writing to the same memory location you are trying to read from when you write the frame to AVI. This forum offers a possible workaround.
Regards,
Isaac S.
Applications Engineer
National Instruments

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