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Kazam: Screencast, then editing: Lost quality and increased size

I recorded a small screencast with the tool Kazam on Ubuntu 18.04.

I am amazed: 7 seconds have only 73kByte. Format: webm

Now I edited the screencast: I cut some seconds at the end.

I did this with OpenShot.

Now the screencast has only 4 seconds. But if I save it, its size has increased (140kByte) and the quality is much lower.

How to record, edit and save a screencast without loosing the small file size and the quality?

It would be nice to have a GUI.

Solution

  • You can use FFmpeg instead of with a GUI application. Simply:

     ffmpeg -i video.webm -ss 00:00:01 -t 00:00:08 -async 1 cut.webm

    It would save your video size.

    If you want FFmpeg with a GUI, you can try Handbreak which is based on FFmpeg.