Thanks for this great piece of software!
I'm using SimpleScreenRecorder utility to capture my desktop and voice. The resulting file is around 66 Mb and 22 minutes long. It is mp4 file, resolution is 1280x720, whereas video is encoded with H.264 (constant rate factor of 23 and preset is "superfast"), while audio is Vorbis, 128 kpbs, 48 kHz.
I then edit this file in Shotcut, mostly doing some cuts, but also applying volume gain filter.
The resulting file after encoding (now around 18 minutes instead of 22) is around 220 Mb when using H.264 Baseline Profile (other H.264 profiles give similar or worse results).
So, my original file has trippled in size!
I played around with various export settings, and settled down to Youtube profile, where i additionaly reduced audio bitrate. The resulting file is now around 180 Mb.
Playing around with video bitrate doesn't help. Too low of bitrate leads to significantly worse picture quality. I could lower the video bitrate so that the file size matches original file size, but with such bitrate the quality is not acceptable. How is it even possible?
I know there was similar topic (this http://forum.shotcut.org/t/why-are-videos-without-cut-out-contents-are-much-bigger-than-the-original-video/578), but it is not helpful.
Are there some hints to further reduce the file size? Ideally, it should be less than original screen+voice capture, because what i actually did is i cut out parts of the video.
Please let me know if any additional information from my side can help.