Dear all, I have the following: 3Gb MP4 (without audio), 1920x1080, 25fps, bitrate 2kbit/s 130Mb MP3 , bitrate 128kbit/s I want to merge them into 1 video with audiotrack. Expecting the final file to be ~3.2Gb (as a sum of video + audio). As a result i have a 6Gb(!) videofile, which (ridiculous!) is...