Problems with Video Files and a Nice Solution

Because of the sanitary emergency, I have been teleworking all this year.

For me, this has implied making lots of videos for my students, so I use InShot and Textro on an Android phone to record/ add effects and then I work on the computer for the post production.  I have been relying on Kdenlive (on PCLinuxOS) and OBS Studio (on OpenMandriva and MX Linux, for live streams).

But then, half way this year, I noticed that sometimes the audio of the videos that I edited on the phone with InShot was out of sync when I loaded them to Kdenlive.

As a solution, I used Pitivi on Mageia to convert the videos, which fixed the problem.  This additional step, however, is time-consuming and time has become an even more precious resource right now when one is teleworking. 

Today, I shot four videos and edited them on InShot.  When I loaded them to the Kdenlinve project, to my distress, the audio was not in sync.

I could not afford to run them through Pitivi and use up an average of 15 minutes on the conversion of each clip. I thought that, if I could join the clips together, the audio might be OK in Kdenlive.  I was worth giving it a shot.

I did a quick search for a Linux tool to merge the four clips together.   I found this page here.

The section on MKVToolNix caught my attention.  I installed it on PCLinuxOS and tried the GUI version.  I could not figure out what I had to do (I was really in a rush), so I closed it and, after opening Konsole, I typed the command (substituting the file names, of course):

mkvmerge -o output.mp4 file1.mp4 \+ file2.mp4 \+ file3.mp4

The konsole window displayed some info in less than five seconds and told me that the operation was completed.

In disbelief, I opened the output video file and... yes, the four clips were there in one.

I put that output file on my project folder in Kdenlive and ran the preview to see if the audio was OK. It was perfect.

This helped me finish the post production a lot earlier.

COVID-19, Telework, and Linux! Happy Anniversary, Mandriva Chronicles!

With the present sanitary emergency created by COVID-19, I've been away from this blog for two months already.

It's not that I have not had the motivation to post, no.  Actually, my work load blew up to three times its normal size because of the mandatory teleworking policies of the university where I work.

In the course of three weeks, I saw everyone move to cyberspace (willingly or reluctantly).  Anxiety, contradictory policies, and uncertainty became the new educational environment for many.  And, with this, I forgot that last Friday was the 10th Anniversary of this humble blog.

 What can I report?

1.  Well, the idea of the younger generations being "digital natives" shattered into a million pieces; as I had always suspected, it was nothing but a myth.  This crisis forced students to use the Web to study and, in great numbers, they are admitting defeat.  It turns out that their online skills seem nothing else that proficiency for using social networks: they cannot read and concentrate, have problems understanding how to post in forums, and become confused when submitting their assignments in an online mailbox.

2.  Linux has been up to the challenge: even though I have been forced to install programs such as Zoom and (yuck!) MS Teams on my laptop and my daughter's desktop, PCLinux OS and Mageia have been reliable, helping me attend meetings and helping my daughter continue with her elementary school classes.

Megatotoro and I decided to ditch Zoom and favored a more flexible online approach.  This idea implied producing lots of audiovisual material --something that we have no training on.  Thus, we had to learn how to produce videos in Linux for our courses.  In a week, I taught myself Kdenlive and Openshot, became more proficient with Audacity, and relied more in the image-editing of the always trustable GIMP.

In the meantime, other professors have been struggling trying to adapt their lessons to something they can deliver through Zoom meetings.  How successful that attempt is I cannot say.  Students claim that Zoom sessions generate anxiety and make them very tired, which has been confirmed in this article.  

So, yes, it has been a busy time.  But, all, in all...

Linux truly saved me from this technological virus that seems to be eroding the mental health of my colleagues...

HAPPY BELATED ANNIVERSARY, MANDRIVA CHRONICLES!!

Kdenlive and Audacity... A Powerful Combo for Education

The university where I work is pushing all professors to use a platform for online courses.

I am very critical of those learning environments because it is easy to claim that technology enhances education without considering the dark side of ICTs.

It was time to give the platform a try.  After all, the university is also advocating the use of FLOSS, so...

The creation of a virtual environment was rather easy, but to produce content is perhaps the most time-consuming activity.  Fortunately, my basic GIMP skills gave me a decent standing concerning the presentation of the different sections.

Then I decided to go ahead and produce a simple video. For this task, I selected Audacity (for recording/editing sound) and Kdenlive (for the video sequence).

I was expecting many problems because I am not an expert in sound/video.  In addition, it was my first time with Kdenlive.

The video-creating process was pretty straight-forward, however.  I got the still images and organized them to fit the sound track that I produced with Audacity and I never felt confused or got stuck; everything was intuitive.

Of course, my video was very simple, but I can say that Kdenlive and Audacity make a powerful combo for beginners who need to produce a quick video for a presentation.


I need to keep experimenting with them.