awesomebytes
commented
3 weeks ago What's the interface for the cameras? USB? Ethernet? Something else?
On Tue, Jun 11, 2024, 18:10 Lintong @.***> wrote:
Hello. I am trying to run 3 cameras that are hardware synchronized by trigger at the same time. I created 3 nodes to run gscam for each camera. However, I found that the timestamp are 10-20ms apart for these images.
In the below image, you can see the base time and timeoffset calculated in the code are very similar, and the only difference is the buffer time (buf->pts). In this example, i am running them at 10Hz.
image.png (view on web) https://github.com/ros-drivers/gscam/assets/72497274/e8a58c7c-f14a-4c98-892a-ff758776d0d6
Can someone explain why this is the case? I thought all three camera images would have reached the buffer around a similar time, maybe 1-2ms apart but not 20ms apart.
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lintong-zhang
Hello. I am trying to run 3 cameras that are hardware synchronized by trigger at the same time. I created 3 nodes to run gscam for each camera. (I set
use_gst_timestampsto True) However, I found that the timestamp are 10-20ms apart for these images.In the below image, you can see the
base timeandtime_offset_calculated in the code are very similar, and the only difference is the buffer time (buf->pts). In this example, i am running them at 10Hz.Can someone explain why this is the case? I thought all three camera images would have reached the buffer around a similar time, maybe 1-2ms apart but not 20ms apart.