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Linux software for making, editing & compressing screencasts

Posted by admin |

Currently I use this:

Recording - Kazam, can record region of the desktop, among other things

Editing - KDEnlive, shows the sound graph very well and makes it easy to punch in markers with just typing "*", and to then remove pauses and extraneous and erroneous words. You make cuts by typing "x" and then cut in a good place. Cut once more, then type "s" to get the selection tool, select the cut part, delete it. Finally right click in the empty space and choose "Remove empty" space from the context menu. That will move all clips in that channel to the right of the cut left in order to close the space.

 KDEnlive is no good in my tests at compressing though, so I render it losslessly, and procede to the next step:

Compressing - Handbrake - still fiddling with the settings here. I want no JPEG artefacts since It's a screencast with sharp edges and few colors, so one would assume some kind of GIF or PNG encoding would be good.

Here are my settings right now for producing a screen cast:

Sound: Mono, mp3, bitrate: 96

Video: Bitrate 150kb/s. Encoder: H264. Tune: still image. Variable frame rate, 2-pass encoding.


Mar 18, 2017 09:10

Sphincs quantum resistant hashing

Posted by admin |

PHINCS-256 is a high-security post-quantum stateless hash-based signature scheme

Read more: Link - SPHINCS: Introduction

Mar 14, 2017 10:47

ChaCha20 a cryptographic algo that is amazingly simple

Posted by admin |

Chacha20 is a secure, fast, and amazingly simple encryption algorithm. It's author Daniel J. Bernstein explains it well in his Salsa20 and Chacha20 design papers (which I recommend), but did not dwell on details experts already know. Filling the gap took me a while.

Read more: Link - The design of Chacha20

Feb 18, 2017 12:40

Prevent Linux raising windows, disrupting your workflow

Posted by admin |

Found an option in Compiz manager -> General options -> Focus and raise behaviour

Changed the 'Focus prevention level' from "Low" to "Normal" and it seems to have worked

Read more: Link - [SOLVED] Prevent newly opened apps to steal the focus

Feb 12, 2017 12:29

On my to-read list

Posted by admin |

Game theory credibility, could be interesting for smart contracts:

A Theory of Credibility - Credibility.pdf

Jan 22, 2017 10:47

Discourse is a very nice message board

Posted by admin |

I really like it.


Read more: Link - Discourse

Nov 20, 2016 01:16

Extract a file with the dtrx command

Posted by admin |

dtrx in Linux tries to extract any archive. It asks questions that can be a bit tricky and confuses case when doing so, but it seems to work fine.'


Untar a File in Linux/Ubuntu -

Nov 17, 2016 12:05

Starting supervisord on Ubuntu 16.04

Posted by admin |
# Make sure Supervisor comes up after a reboot.
sudo systemctl enable supervisor

# Bring Supervisor up right now.
sudo systemctl start supervisor


Read more: Link - supervisord - ubuntu server 16.04: cannot get supervisor to start automatically - Unix & Linux Stack Exchange

Nov 15, 2016 10:35