Screen capture video and sound on Ubuntu

There are a couple of ways you can do a screen capture on Ubuntu. The problem is that most of the integrated graphical user interfaces are either not stable and crash in the middle of recording, or are not using proper codecs thus creating huge files, which one has to convert in order to edit or publish.

I'll share the two basic and reliable tools I'm using: Simple Screen Recorder and manually recording via FFmpeg:
For the Simple Screen Recorder is notable that it has pause shortcuts as well as one can adjust its various options very easily.

Installation:

sudo add-apt-repository ppa:maarten-baert/simplescreenrecorder
sudo apt-get update
sudo apt-get install simplescreenrecorder

Afterward, just start using the program.

The second option is to manually record your screen. The first step is to install FFmpeg

sudo apt-get install ffmpeg

 Then create capture.sh file with

sudo nano capture.sh

and place the following information inside. Contents of the screen recorder:

#!/bin/sh
#
REC_iface=$(pactl list sources short | awk '{print$2}')
SCREEN_res=$(xrandr -q --current | grep '*' | awk '{print$1}')
REC_iface=alsa_input.usb-Superlux_digit_Superlux_E205U-00.analog-stereo
ffmpeg -async 1 -threads auto -f pulse -i $REC_iface -ac 2 -acodec vorbis -f x11grab -thread_queue_size 1024 -r 15 -s $SCREEN_res -i :0.0 -vcodec libx264 -crf 36 -preset slow -pix_fmt yuv420p  screencast.mp4

the only thing you need to change in this file is the REC_iface, this is your microphone input which you can find with the command:

pactl list sources short

Afterward, give chmod +x capture.sh to the file to make it executable.

then start the capturing process:
./capture.sh
this will start the recorder. Wait 5 seconds and start your screencast. When ready just click CTRL+C to stop the recording.

Cheers!