Thread: repeatedly reading from a url? anyone?

i'm working on an engineering app which takes a camera live feed from a given url and updates the live feed in matlab. this is later going to be used for image processing, and with the current setup i am only able to attain a framerate of ~3 fps, where our target is more like 10+ fps.

my code is actually in matlab, but here's the jist of what i'm doing right now, and then what i want to do.

NOW:
create a new URLConnection
create a new InputStream (URLConnection.getInputStream)
open a file
create a new FileOutputStream
copy the input stream over to the output stream
close the file
close the input stream
close the connection
rinse, and repeat

im guessing that connection negotiations are significantly slowing down this whole process, so what i'd like to do is:

open a URLConnection, InputStream, FileOutputStream (allocate basically)
while(...) {
open a temp file
create associated stream
push inputstream into fileoutputstream
display temp file
refresh inputstream (input image should change each read)
}
close everything

my main problem is, i don't know how to refresh the InputStream without opening a brand new URLConnection.

sorry for my rambling haha thanks y'all

See posts on the other forum.

Could you provide links to all the forums where you have posted this question?

I'd suggest trying to do this using a Socket rather than establishing the connection every time. Seems like you want to establish a Client/Server pair...see
All About Sockets

Originally Posted by copeg

I'd suggest trying to do this using a Socket rather than establishing the connection every time. Seems like you want to establish a Client/Server pair...see
All About Sockets

this is interesting, but i can't open a tcp socket because i'm actually reading the raw image data from the url... for example, i would read an image into matlab from a url such as:

http://1.1.1.1/hello/world.jpg

i don't have access to the remote url which i am reading from, so i can't create a client-side application to send the necessary data.

So the images being written by the server every update? Is it over-writing the same image every time, or writing to multiple images? You may want to consider spawning a few threads to work in parallel rather than tying up a single thread trying to do all the work. This may have its own problems such as coordinating the threads and multiple downloads of the same jpg, but it might point you in the right direction.