Any screencast with zoom & draw for Linux?

walterbyrd · 03-26-2017, 04:09 PM

Something that would also work on FreeBSD would be really great.

By screencast, I mean something that will record the desktop as if somebody is filming with a video camera. Some examples include: kazam, gtk-recordmydesk, and ffmeg. But, I do not think any of those include drawing or zooming.

By drawing I mean using the mouse to draw circles and arrows and the like. By zooming I mean expand one small part of the screen.

There are several apps to do this with MacOS and Windows: screencast-o-matic, camtasia, zoomit, jing, screenflow. But I don't know of any screencast app that includes zoom and draw, that will work on Linux, much less FreeBSD.

teckk · 03-29-2017, 10:09 AM

Quote:

By zooming I mean expand one small part of the screen.

ffmpeg will do that with no trouble.
Here is a 5 second example, getting the top left corner and doubling it's size, saving to x264 .mp4 and no audio.

Code:

ffmpeg -f x11grab -r 24 -s 320x240 -i :0.0 -t 00:00:05 -an -c:v libx264 -b:v 500k -s 640x480 output.mp4

Another example 100 pixles down and over from left, saving raw video with no audio

Code:

ffmpeg -f x11grab -r 20 -s 400x300 -i :0.0+100,100 -t 00:00:05 -an -c:v rawvideo -pix_fmt yuv420p -s 800x600 output2.avi

Quote:

I mean using the mouse to draw circles and arrows

You can capture the mouse movements with that. You can also use ffmpeg to overlay an image onto the video where you want, or subtitles, or capture your mics audio with the screen capture.
Look at man ffmpeg

And that will work on BSD with ffmpeg.