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Re: Yes, You Need A Firewall On Linux - Here’s Why And Which To Use

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On 2025-08-21 12:34, The Natural Philosopher wrote:
> On 21/08/2025 10:44, Carlos E.R. wrote:
>> I do not want reference documentation.
>>
>> I primarily want documentation that allows me to start using a new 
>> program, fast, and to achieve my goals.
>>
>> Once I have that, I want the reference documentation.
> 
> +1001

Yesterday, I wanted to share a video on WhatsApp. It was taken by a 
wildlife camera, and WhatsApp refused, said the video was not compatible.

First I tried avidemux, but still WhasApp refused.

I'm familiar with ffmpeg, I know it can do it. But it has a huge manual 
(which I have read), and they change the CLI interface often enough so 
that recipes I have in my notes no longer work. Finding the concoction 
will need a lot of time. So I can google, I can ask somewhere and wait, 
or I can ask ChatGpt. I did the later.

I got a reply that missed the output file (is that an hallucination or a 
"human" mistake?):

ffmpeg -i IMAG0009.avi -vf "scale=640:-2" -c:v libx264 -profile:v \
    baseline -level 3.0 -preset fast -c:a aac -b:a 128k \
    -movflags +faststart

To that I added "bird.avi" as output file, but WhatsApp rejected it. So 
I told ChatGpt all that. It replied giving me the missing data:

ffmpeg -i IMAG0009.avi -vf "scale=640:-2" -c:v libx264 -profile:v \
    baseline -level 3.0 -preset fast -c:a aac -b:a 128k \
    -movflags +faststart bird_whatsapp.mp4

and that worked. Having that command line, I modified it easily for more 
resolution (scale=1024:-2). I was already familiar with all the options, 
I just needed to find which would produce the wanted result, and not 
spend a day on it.


But if I want to find in the manual what "-b" stands for, I fail. Ask 
chatgpt, instant reply, it is bitrate. Oh, yes, I remember now.

:-)


Oh, searching the man for "movflags" or "faststart" fails. So ask the 
AI. They are in the man page for the MP3 muxer, it says. Oh, right, I 
forgot that.


So, even a reference manual is hard to use when you want to find a 
particular reference, basically using "grep".


-- 
Cheers, Carlos.

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Re: Yes, You Need A Firewall On Linux - Here’s Why And Which To Use "Carlos E.R." <robin_listas@es.invalid> - 2025-08-19 12:35 +0200
  Re: Yes, You Need A Firewall On Linux - Here’s Why And Which To Use Mike Scott <usenet.16@scottsonline.org.uk.invalid> - 2025-08-19 12:18 +0100
    Re: Yes, You Need A Firewall On Linux - Here’s Why And Which To Use Marc Haber <mh+usenetspam1118@zugschl.us> - 2025-08-19 15:16 +0200
      Re: Yes, You Need A Firewall On Linux - Here’s Why And Which To Use Lawrence D’Oliveiro <ldo@nz.invalid> - 2025-08-20 01:02 +0000
  Re: Yes, You Need A Firewall On Linux - Here’s Why And Which To Use Lawrence D’Oliveiro <ldo@nz.invalid> - 2025-08-20 01:01 +0000
    Re: Yes, You Need A Firewall On Linux - Here’s Why And Which To Use "Carlos E.R." <robin_listas@es.invalid> - 2025-08-20 12:52 +0200
      Re: Yes, You Need A Firewall On Linux - Here’s Why And Which To Use Lawrence D’Oliveiro <ldo@nz.invalid> - 2025-08-20 22:36 +0000
        Re: Yes, You Need A Firewall On Linux - Here’s Why And Which To Use "Carlos E.R." <robin_listas@es.invalid> - 2025-08-21 11:44 +0200
          Re: Yes, You Need A Firewall On Linux - Here’s Why And Which To Use The Natural Philosopher <tnp@invalid.invalid> - 2025-08-21 11:34 +0100
            Re: Yes, You Need A Firewall On Linux - Here’s Why And Which To Use "Carlos E.R." <robin_listas@es.invalid> - 2025-08-21 14:36 +0200
              Re: Yes, You Need A Firewall On Linux - Here’s Why And Which To Use Nuno Silva <nunojsilva@invalid.invalid> - 2025-08-21 14:27 +0100
                Re: Yes, You Need A Firewall On Linux - Here’s Why And Which To Use "Carlos E.R." <robin_listas@es.invalid> - 2025-08-21 21:37 +0200
                Re: Yes, You Need A Firewall On Linux - Here’s Why And Which To Use Nuno Silva <nunojsilva@invalid.invalid> - 2025-08-22 10:33 +0100
                Manuals [Was: Yes, You Need A Firewall On Linux - Here’s Why And Which To Use] "Carlos E.R." <robin_listas@es.invalid> - 2025-08-22 12:39 +0200
              Re: Yes, You Need A Firewall On Linux - Here’s Why And Which To Use Lawrence D’Oliveiro <ldo@nz.invalid> - 2025-08-22 01:12 +0000
          Re: Yes, You Need A Firewall On Linux - Here’s Why And Which To Use Lawrence D’Oliveiro <ldo@nz.invalid> - 2025-08-22 01:06 +0000
            Documentation [Was: Yes, You Need A Firewall On Linux - Here’s Why And Which To Use] "Carlos E.R." <robin_listas@es.invalid> - 2025-08-22 12:26 +0200
              Re: Documentation [Was: Yes, You Need A Firewall On Linux - Here’s Why And Which To Use] Lawrence D’Oliveiro <ldo@nz.invalid> - 2025-08-23 23:13 +0000
    Re: Yes, You Need A Firewall On Linux - Here’s Why And Which To Use John Ames <commodorejohn@gmail.com> - 2025-08-20 07:47 -0700
      Re: Yes, You Need A Firewall On Linux - Here’s Why And Which To Use Lawrence D’Oliveiro <ldo@nz.invalid> - 2025-08-20 22:37 +0000
  Re: Yes, You Need A Firewall On Linux - Here’s Why And Which To Use Stéphane CARPENTIER <sc@fiat-linux.fr> - 2025-08-20 19:25 +0000
    tldr [WAS: Yes, You Need A Firewall On Linux - Here’s Why And Which To Use] "Carlos E.R." <robin_listas@es.invalid> - 2025-08-21 12:04 +0200
      Re: tldr [WAS: Yes, You Need A Firewall On Linux - Here’s Why And Which To Use] Stéphane CARPENTIER <sc@fiat-linux.fr> - 2025-08-23 12:40 +0000
        Re: tldr [WAS: Yes, You Need A Firewall On Linux - Here’s Why And Which To Use] "Carlos E.R." <robin_listas@es.invalid> - 2025-08-24 00:40 +0200
        Re: tldr [WAS: Yes, You Need A Firewall On Linux - Here’s Why And Which To Use] Lawrence D’Oliveiro <ldo@nz.invalid> - 2025-08-23 23:15 +0000
          Re: tldr [WAS: Yes, You Need A Firewall On Linux - Here’s Why And Which To Use] Stéphane CARPENTIER <sc@fiat-linux.fr> - 2025-08-24 11:22 +0000
            Re: tldr [WAS: Yes, You Need A Firewall On Linux - Here’s Why And Which To Use] Lawrence D’Oliveiro <ldo@nz.invalid> - 2025-08-24 22:18 +0000

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