When extactly does the hangouts_video_call.ogg extracted from hangout.apk?

Two ringtones are extracted from Hangout.apk to */storage/ringtones* folder during some system setup phase. To analyze that, I manually deleted the ringtone files from my_files >> Ringtone. Now, no hangout ringtone in *settings->sound->ringtone*. Then, done "*Factory reset*" from settings. Now, hangout ringtones didn't restored. Now, i did "Factory reset" from recovery mode.Those hangout ringtones are restored again. That is visible through MyFiles as well as RingtoneChooser. So, it turned out that "Factory reset" is somewhat different between "recovery mode" and from "settings". I need to know when extactly does the hangouts_video_call.ogg extracted from hangout.apk? How can i find the log ? Any clue will be highly helpful.