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Topic starter
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
Topic starter
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
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.
DaveE reacted
2022-08-09 4:00 pm
Video making is its own art/lots of work. I use Screenflow and final cut pro. In the first few months you will have problems with everything, from sound to programs crashing, bad lighting etc. Accent can be a problem and it's hard to overcome. Subtitles help. Most people now watch videos with sound off (!!) so people burn subtitles in and that's clever. In general, for electronics video accent might be less of a problem. temi was a nice subtitle service. I use it with Final Cut. Anyway. It's a long journey!
2022-08-09 4:09 pm
@lookfwd I don't ever remember turning off the sound when watching a video.
First computer 1959. Retired from my own computer company 2004.
Hardware - Expert in 1401, and 360, fairly knowledge in PC plus numerous MPU's and MCU's
Major Languages - Machine language, 360 Macro Assembler, Intel Assembler, PL/I and PL1, Pascal, Basic, C plus numerous job control and scripting languages.
Sure you can learn to be a programmer, it will take the same amount of time for me to learn to be a Doctor.
2022-08-09 6:08 pm
@will Can't say I ever did that, just shows you there is no such thing as an average user.
First computer 1959. Retired from my own computer company 2004.
Hardware - Expert in 1401, and 360, fairly knowledge in PC plus numerous MPU's and MCU's
Major Languages - Machine language, 360 Macro Assembler, Intel Assembler, PL/I and PL1, Pascal, Basic, C plus numerous job control and scripting languages.
Sure you can learn to be a programmer, it will take the same amount of time for me to learn to be a Doctor.
lookfwd reacted
2023-03-25 9:38 pm
@robo-pi I like to use the DaVinci Resolve free version for my videos. It has a built-in sound editing feature called Fairlight. It is practically the industry standard for color grading video. As far as syncing the audio to the video I always hold my hands up to the camera and clap loudly. That produces a visual cue and an audio spike that I can later use to sync audio to video. And, since fairlight is in the same DaVinci Resolve editing platform, I don't think it would shrink the audio as you described. I've never experience it. Also, there are TONS of YouTube videos covering the use of it. My favorites are the Casey Farris and JayRTV YouTube channels.
Also, for screen capture for videos I need it for, I use the free software OBS (Studio?). You setup "Scenes" that include your hardware sources, Screen Capture; Webcam; microphone, etc . There is a learning curve in the beginning, but as I do things over and over and learn more things, it is really becoming a nice workflow for me.
Hope this helps.
2023-03-28 2:08 am
To err is human.
To really foul up, use a computer.
2023-03-28 2:56 am
OMG. I hope you are telling me the truth. I know this was an old post after I replied, but if true that @robi-pi has past. Well, that's sad. If so I wish the best for Rob-pi's family. I hope you're not pulling my leg. If so, that's on you, not me. Again, sad. I wish the best for his/her family.
2023-03-28 4:10 am
@abbienormal1960 Sadly, it's true. There should be some sort of graphic to add to the avatar, so people know.
First computer 1959. Retired from my own computer company 2004.
Hardware - Expert in 1401, and 360, fairly knowledge in PC plus numerous MPU's and MCU's
Major Languages - Machine language, 360 Macro Assembler, Intel Assembler, PL/I and PL1, Pascal, Basic, C plus numerous job control and scripting languages.
Sure you can learn to be a programmer, it will take the same amount of time for me to learn to be a Doctor.
2023-03-28 10:51 am
James (Robo-Pi) was and still is the forum's most illustrious member, his posts were legendary and his poetry unmatched. We were all devastated when we lost him to cancer. The forum has not been the same without him.OMG. I hope you are telling me the truth. I know this was an old post after I replied, but if true that @robi-pi has past. Well, that's sad. If so I wish the best for Rob-pi's family. I hope you're not pulling my leg. If so, that's on you, not me. Again, sad. I wish the best for his/her family.
There should be some sort of graphic to add to the avatar, so people know.
I would never do that. In the few cases when a family member informs me of the death of a member (three times so far, not including James) I have deleted the accounts and posts at their request. But in this case, his sister Marilyn asked that it be preserved, so she can read the posts (and poetry) that he graced us with. I intend to respect her wishes and will not alter the account in any way.
😎
Bill
"Never trust a computer you can’t throw out a window." — Steve Wozniak
Ron reacted
2023-05-21 12:46 pm
视频也是记录生活的一种方式。