web_stream functions in loadrunner (web_stream_open & web_stream_close) and Error -26309: Another streaming with the same ID

Video streaming has become a common factor nowadays and most of the web pages are having videos streaming in them. So we will have to test the performance of the videos also, like the rendering time, buffer time, play time and so on.

Below are the loadrunner functions which get generated when we record a web page with video streaming in it. All the functions are straight forward and easy to understand.

If we notice, we have a ID assigned to the video in the web_stream_open function and the same ID is passed on to the other web_stream functions below. This ID is generated by loadrunner and will be unique to each video.

Script works fine in Vugen and when the same script is run with multiple concurrent users in controller, we get the below error message.

Error -26309: Another streaming with the same ID "3" has already been registered. Please set a new ID not registered

Error message means that one of the vuser is using the video with the ID = 3 and another vuser is trying to access the same video with ID = 3, and it is unable to stream the video. It is also requesting us to set a new unregistered ID to access the same video content.

Now, what we have to do is, we need to modify the ID in such a way that vusers do not clash when trying to stream the same video. Initially I tried using the inbuilt parameters like unique, random and vuser to replace ID, but still I got the same error. As a next step I wrote a C code using srand() & rand() to generate random numbers as ID for each vuser and pass it on to the argument ID. Below is the code snippet.