Video production nightmares.  

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Robo Pi
(@robo-pi)
Noble Member
Joined: 9 months ago
Posts: 1462
2020-02-05 1:54 am  

I'm working on a KiCad tutorial video.   I just recorded a 10 minute presentation.   I'm thinking this will probably be the first 1/3 of the actual video.  So the full video will be about 30 minutes long.   However, I've been working on this for two full days now just to try to get this first 10 minutes recorded properly.

I actually had to record the entire video four times!  Some were due to my own stupid mistakes.  But when I finally recorded a "perfect" video I realized that sound was all garbled.  Turned out to be a bad connection on the microphone.  Grrrrrrrrr!  So I had to do it over again.  Then when I finally got a "perfect video" I realized that the mouse cursor hadn't been recorded.  So I had to do it over one more time just to record the mouse cursor.  So I've already made the first 10 minutes of this video four times over.

When I finally got the video finished I needed to clean up the sound.  So I extracted the sound from the video and cleaned it up on Audacity.  However, when I put it back into the video I realized it wasn't lined up perfectly anymore.   And it wasn't just offset by a constant, but the audio track was actually shorter than the original.  So it was being played back at a slightly different speed.    I'll need to look into why that's occurring.  Fortunately in this video I'm not recording my face so I don't need to worry about lip-sync.  But clearly this is going to be a problem for any videos where lip-sync is important.

In any case, after all that I put the video into Kdenlive on the Jetson Nano to do some final editing.   The program crashed on me four times!  Losing all my work every time.   I think the crashes were basically my fault.   After a lot of patience and retrying I finally got the video edited and it's currently being rendered as I type this.   It's going to take 20 minutes to render a 10 minute video.  Assuming it doesn't crash in the process.

To make matters worse, I record other parts of the video in 1280 x 720.   But this video is in 1920 x 1080.   So I'm not sure how this is going to work with the other parts of the video?

I looked and do not see a way to tell the screen capture program to record in 1280 x 720.   So I've got tons of learning to do on how to make videos yet.   I hope this works out.   I'll be combining this with previous parts of the video shortly and see how that goes.

I sure hope I can get this down to a more dependable process.   I really need to invest in a super computer for processing video content.   Kdenlive on the Jetson Nano appears to be working to some degree.  But it takes its good old time.

 

DroneBot Workshop Robotics Engineer
James


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Robo Pi
(@robo-pi)
Noble Member
Joined: 9 months ago
Posts: 1462
2020-02-05 3:13 am  

SLOWLY LEARNING!

I just discovered that the way to record a 1280 x7 20 screen video is to simply set the monitor to 1280 x 720.

Duh. 😲 

That works.  Makes for smaller videos files and quicker rendering too.  Plus it has the added advantage of making everything larger on the screen which is good for an instructional video.

Now I need to record the entire 10 minute video from scratch once again!  Chalk it up to a hard learning curve.  But at least I'm making progress ever so slowly.

DroneBot Workshop Robotics Engineer
James


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casey
(@casey)
Reputable Member
Joined: 8 months ago
Posts: 328
2020-02-05 7:22 am  

If I had to choose between a video tutorial and a text tutorial I would choose the text. A video can give a good overall feel and understanding of the subject matter but as a reference or study it is a nightmare.  With text you can quickly find the part of interest and read at the speed that most suits you.  No continual rewind or pause of a video required.  My understanding however is that the utube videos can provide an income to the creator whereas the text does not?

 Unlike Bill and a few others many who make videos really don't have the clear speaking style required or they have a strong accent I struggle to decipher.  Most of what I know on electronics and programming came from the many books I have collected over the years and I can usually quickly pick out the book and page on the topic I needed to reread or reference.

So in short: videos by a good teacher like Bill are worth watching but they must be backed up by text otherwise you waste a lot of time rewinding and pausing while trying to take notes. 

 


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