Lazarus

Programming => General => Topic started by: sysrpl on December 05, 2021, 02:25:23 pm

Title: Do you want video tutorials?
Post by: sysrpl on December 05, 2021, 02:25:23 pm
I am getting ready to start recording some of my projects running on Raspberry Pi computers and have my video capture environement ready, as the Raspberry Pi isn't powerful enough to both run my Pascal demos and record itself with ffmpeg.

This had me thinking, do you guys have any interest in Lazarus development related videos? I made a test video located below. If you're interested let me know and I may record some tutorials on specific topics and up the productions values. Let me know and I might move forward on this.

Here is an example:

https://www.twitch.tv/videos/1224798488

Of course I could also self host this content, ensuring t never expires.
Title: Re: Do you want video tutorials?
Post by: AlexTP on December 05, 2021, 03:02:41 pm
This video is either unavailable or not supported in this browser. (Error #4000)
Linux x64, Firefox.
Title: Re: Do you want video tutorials?
Post by: sysrpl on December 05, 2021, 03:12:41 pm
This video is either unavailable or not supported in this browser. (Error #4000)
Linux x64, Firefox.
If your system cannot play the video, then this is the correct message. Apparently, you are missing some video codecs that you need to install if you expect to view this video and others like it. At a guess, I'd say that you do not have the AVC (Advanced Video Codec) installed. Use ffprobe to verify.

     Stream #0:0(und): Video: h264 (High) (avc1 / 0x31637661), yuv420p(tv,bt709), 1920x1080 [SAR 1:1 DAR 16:9], 5955 kb/s, 60 fps, 60 tbr, 15360 tbn, 120 tbc (default)
     Metadata:
       handler_name    : VideoHandler
     Stream #0:1(und): Audio: aac (mp4a / 0x6134706D), 48000 Hz, stereo, fltp, 128 kb/s (default)
     Metadata:
       handler_name    : SoundHandler

Title: Re: Do you want video tutorials?
Post by: dseligo on December 05, 2021, 07:36:20 pm
This video is either unavailable or not supported in this browser. (Error #4000)
Linux x64, Firefox.
If your system cannot play the video, then this is the correct message. Apparently, you are missing some video codecs that you need to install if you expect to view this video and others like it. At a guess, I'd say that you do not have the AVC (Advanced Video Codec) installed. Use ffprobe to verify.

I also tried to view the video and got same error. I'm on Windows 11.
While I am not particularly interested in watching videos, I think that for a purpose of tutoring you should make videos that don't request installing additional video codecs. It will probably repel your intended audience.
Title: Re: Do you want video tutorials?
Post by: Tony Stone on December 05, 2021, 07:41:01 pm
YES.  Simply YES!  I have been following a lot of your content from the stuff you post in the IRC channels and your web site at https://www.getlazarus.org/ (https://www.getlazarus.org/)!  You have a lot of interesting stuff so far.  Keep it up and thank you!
Title: Re: Do you want video tutorials?
Post by: Blade on December 05, 2021, 10:14:40 pm
I'm also getting an error message.

"This video is either unavailable or not supported in this browser. (Error #4000)"

Why not use YouTube or DailyMotion?
Title: Re: Do you want video tutorials?
Post by: Bart on December 05, 2021, 10:32:02 pm
I also tried to view the video and got same error. I'm on Windows 11.
While I am not particularly interested in watching videos, I think that for a purpose of tutoring you should make videos that don't request installing additional video codecs.

+1 here.

Bart
Title: Re: Do you want video tutorials?
Post by: Tony Stone on December 05, 2021, 11:15:51 pm
Video played fine for me by the way.  I am using Brave browser and Linux Mint with Cinnamon... if it is of any value to you.

And I agree with others, video tutorials tend to be usually only good for beginners.  The School Freeware Lazarus videos are quite good IMO.  Right to the point...

But I anytime I am trying to understand anything with some complexity videos tend to leave me with more questions or start to make me disinterested in the subject.  Some people that that are very knowledgeable and experts in areas make absolutely horrible video presentations! lol... We can't all be good at everything.

And the people putting videos out with no audio what so ever shouldn't even bother uploading!   %)
Title: Re: Do you want video tutorials?
Post by: trev on December 06, 2021, 12:21:33 am
I also tried to view the video and got same error. I'm on Windows 11.
While I am not particularly interested in watching videos, I think that for a purpose of tutoring you should make videos that don't request installing additional video codecs. It will probably repel your intended audience.

+1 here too. (FreeBSD 12, SeaMonkey 2.53.10)
Title: Re: Do you want video tutorials?
Post by: sysrpl on December 06, 2021, 01:13:54 am
After a bit of research, I've found the problem is Firefox does not support the yuv422 color space which is what my USB video capture box outputs. Conversion to yuv420 or other color spaces during streaming results in compression artifacts and other nasty things.
Title: Re: Do you want video tutorials?
Post by: dseligo on December 06, 2021, 02:21:41 am
I've found the problem is Firefox does not support the yuv422 color space

Yes, I can confirm that it works in Edge
Title: Re: Do you want video tutorials?
Post by: cappe on December 06, 2021, 08:28:27 am
Video works for me
Title: Re: Do you want video tutorials?
Post by: 440bx on December 06, 2021, 09:14:54 am
FWIW, it also plays for me without any trouble.  That's using Chrome on Win 7.

Aside from that, very nice stuff @sysrpl.  Your video reminded me of Archimedes and Galileo :)
Title: Re: Do you want video tutorials?
Post by: cappe on December 06, 2021, 10:25:54 am
Regarding what I wrote, I make a correction, with linux with Chorme works, while with firefox it tells me unsupported video (Error #4000)
Title: Re: Do you want video tutorials?
Post by: marcov on December 06, 2021, 01:31:39 pm
Windows 10, firefox, also error 4000
Title: Re: Do you want video tutorials?
Post by: dseligo on December 07, 2021, 08:58:25 am
OP already said:

After a bit of research, I've found the problem is Firefox does not support the yuv422 color space which is what my USB video capture box outputs. Conversion to yuv420 or other color spaces during streaming results in compression artifacts and other nasty things.

So: Firefox won't play this video.
Title: Re: Do you want video tutorials?
Post by: nomorelogic on December 11, 2021, 11:28:48 am
for those who use linux with kde: firefox does not play the video but konqueror does
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