The Smart Client AVI Sequence Export plugin sample shows how to do it. It is important to note that the same methods (same classes) shown in this plugin sample can be used in a standalone application.
I will do an experiment as I do not know the answer, I only know that using the Export sample without modification you cannot do this. Sorry to keep you waiting.
I find no way to make two exports at once. If I make two separate exports I find no way to effectively merge them. The functionality is missing in the MIP SDK. I will make a request for enhancement to Milestones Product Management. Product Management will make the prioritization if and when it should be added in the MIP SDK.
Product Management will evaluate and prioritize the requests. Not all requests will be implemented. No new request will make it into the upcoming 2018R1 release.
in SDK 2020R2 is there the functionality that allows you to merge two exports made with the SDK? or is there the possibility to export multiple periods (example from 12:00 to 12:15 and from 13:00 to 13:15) in a single export?
In the export example only one period can be exported at a time.
I am a bit confused and in the dark. It seems no change to this were made in 2018R3 release or later regrading this. Whether it was given up for a technical reason or priorities were shifted or something different I cannot say.
The Export sample can only export one time period, and this reflects the capabilities of the DBExporter capabilities.