I did not run myself but he sent me an example and my 1.4 GB file went down to 74 MB without any particularly noticeable quality loss (note that most of the videos are slides and completely static for minutes, so it stands to reason that they compress very well). Then a student suggested I use this to compress the videos with thisįfmpeg -i input.mp4 -vf scale=1920:-1 -vcodec libx264 -crf 20 output.mp4 Unsurprisingly, files are very big but visual quality as good as it gets. I lazily started by using the default preset for H.264 ('Match Source - High bitrate). The problem is in encoding the final sequences. It still looks fairly decent and I import clips in Adobe Premiere Pro 2020 and edit them. My source is probably seen as abysmal from professionals: it is a screen capture (4K) by Zoom, heavily compressed.
I care a bit for video quality and a bit more for small size. I am a terrible ignoramus in the subject, but the coronavirus has thrown me in the business of producing videos with my lectures.
