If the application hits the disk space limitation it stops the processing automatically. Make sure that you have enough free space on the disk for the indexing files. Approximately, you need to have at least half of the total folder size of free space. For example, an indexing file for 2.5 hours of video takes about 1.1 GB of disk space.
To filter false positive results, consider setting the Minimal Detected Duration to at least 1 second, and the Accuracy to “Precise”.
You can dynamically add new files to the content and the archive folders while the search is running. The archive is re-scanned if the content database is updated, so you have actual results all the time.
You might consider disabling the “Clean Up on the Start of the Search” setting in the Preferences if you want to run multiple searches for the same archive. For example, you start a search for one content folder. After some time, you get the first part of the results. Then you change the Content folder path. When you start the search next time, the search results will consider content files from both the current and the previous folders. The previous results will be updated with the new content, and you will have results from 2 Content folders once the process is complete.