[jitsi-users] Which installation on which computers? Jitsi-meet still alive?


#1

Hi you "more-geeks-than-me"

There are lot of instructions, lots of features described-however I am lost:

1. Do I have to run an own server to use jitsi-meet?
2. Do I have to make a new installation (of which component?) each time
    I want to open a conference? According to the instruction below the
    host name has to be entered during installation. Confusing.
    At most I would make installations on host/servers once and leave
    them allone for unlimtted future use from persons that have the
    credentials.
3. Also confusiong according to that instruction you only need to
    install jitsi-meet but no videobridge?
4. Can others just use the conference without the person that
    originally organized it and made the installations?
5. Which servers (within the EU) are there where I can just open
    conferences?
6. Which of them support video?
7. Which pieces of software have to install those that just wish to
    join a conference?
8. Which software has to install the person that organizes the
    conference - on which computer? In my opinion should be as easy as
    to open a new whatsappgroup.
9. Is jitsi and/or jitsi-meet still alive? In the web I find a lot of
    stuff from 2014 and older that I am unsure if instructions given
    there are valid for the current releases.
    http://www.linux-magazin.de/Ausgaben/2015/12/Videokonferenzen (End
    2015) says that still improvement is needed. After such articles I
    would expect a reply in "News" or "Media" (Article in Media from
    2013! No updates after that).
10. Which restrictions are there from different browsers and operating
    systems? In my conferences individual persons come together that use
    mainly different windows, some Linux (Mint(Ubuntu)) like me,
    Browsers are the IE, Firefox and don't know what else. I want to
    transmit the webcam from all of them to all of us with audio and
    chat. Audio+video-chat all together is a must, encryption and
    support of mobile phones just a bonus.

I used instructions from
https://github.com/jitsi/jitsi-meet/blob/master/doc/quick-install.md
I am geek enough for hours of patience to fight through and understand
software that finally has to turn out as simple.
I want avoid Skype because of its horrible general terms and conditions,
servers under control of the NSA.
The people I support expect click-install-run. Installation has to be
straight-foreward or last not longer than 20 Min.

Frank


#2

Hi,

Hi you "more-geeks-than-me"

There are lot of instructions, lots of features described-however I am lost:

1. Do I have to run an own server to use jitsi-meet?

No, you can use someone else's deployment, e.g. https://meet.jit.si

2. Do I have to make a new installation (of which component?) each time
    I want to open a conference? According to the instruction below the
    host name has to be entered during installation. Confusing.
    At most I would make installations on host/servers once and leave
    them allone for unlimtted future use from persons that have the
    credentials.

No.

3. Also confusiong according to that instruction you only need to
    install jitsi-meet but no videobridge?

Correct. Why is it confusing?

4. Can others just use the conference without the person that
    originally organized it and made the installations?

Yes, depending on configuration.

5. Which servers (within the EU) are there where I can just open
    conferences?

https://meet.jit.si has servers located in EU, which will be used if you open a conference from EU.

6. Which of them support video?

All of them.

7. Which pieces of software have to install those that just wish to
    join a conference?

They need one a WebRTC-capable browser (Chrome, Firefox, Chromium).

8. Which software has to install the person that organizes the
    conference - on which computer? In my opinion should be as easy as
    to open a new whatsappgroup.

No additional software required.

9. Is jitsi and/or jitsi-meet still alive? In the web I find a lot of
    stuff from 2014 and older that I am unsure if instructions given
    there are valid for the current releases.
    http://www.linux-magazin.de/Ausgaben/2015/12/Videokonferenzen (End
    2015) says that still improvement is needed. After such articles I
    would expect a reply in "News" or "Media" (Article in Media from
    2013! No updates after that).

They are both alive. I count 4150 commits this year for jitsi-meet related projects.

10. Which restrictions are there from different browsers and operating
    systems? In my conferences individual persons come together that use
    mainly different windows, some Linux (Mint(Ubuntu)) like me,
    Browsers are the IE, Firefox and don't know what else. I want to
    transmit the webcam from all of them to all of us with audio and
    chat. Audio+video-chat all together is a must, encryption and
    support of mobile phones just a bonus.

https://meet.jit.si/unsupported_browser.html

I used instructions from
https://github.com/jitsi/jitsi-meet/blob/master/doc/quick-install.md
I am geek enough for hours of patience to fight through and understand
software that finally has to turn out as simple.
I want avoid Skype because of its horrible general terms and conditions,
servers under control of the NSA.
The people I support expect click-install-run. Installation has to be
straight-foreward or last not longer than 20 Min.

By "people" do you mean users of the system? They simply need to open a link in their browser.

Regards,
Boris

···

On 22/12/2016 18:13, Frank wrote:


#3

Hi,

I tried to open a conference and indeed seemingly a jitsi-meet window
openes when I entered
https://frank-thinkpad-t420/Trial in my Firefox.

1. Should I have entered "https://meet.jit.si" instead of
    "frank-thinkpad-t420" (which is my local computer) during installation?
2. Will others anyway be able to join a conference when I use
    "frank-thinkpad-t420"?
3. If not: How can I add or at least replace "frank-thinkpad-t420" by
    other hosts that allows others to access a conference?
    Whenever I tried to repeat the installation with another host name
    it says that jitsi meet already is installed and I found no
    instructions how to remove that installation to replace it by a
    correct one.
4. What happens if there are two groups that wish to open a conference
    of the same name using https://meet.jit.si/something?
5. Even if "frank-thinkpad-t420" was correct this denomination might be
    used by more than one user. What happens when these both open a
    conference?
6. However in the lower right corner there is a small window that says
    "me" but there is nothing shown from my webcam and in settings I
    can't select my webcam nor microphone - nothing. Pushing the camara
    icon does not help, neither.
7. Are all these settings only available after the choice of a correct
    host?
8. Do I have to start a conference before I can change these settings?
9. Is the use of a gravatar obligatory?
10. For which service, which server do I login using the Login-button
    under Autenticate in Profile?
11. How is encryption done when I and other participants only enter the
    url of the conference?
12. How is privacy assured?
13. Will the invited parties asked for a password?
14. Which password would that be?
15. As soon as I get a conference running with 3 participants working
    using different OS I could write step by step a german documentation
    for jitsi meet. Where should I post it to? In which format?
    For the website I suggest to separate documentation for jitsi-meet
    from documentation of videobridge and jitsi to avoid confusion.

Regards Frank

···

Am 23.12.2016 um 01:49 schrieb Boris Grozev:

Hi,

On 22/12/2016 18:13, Frank wrote:

Hi you "more-geeks-than-me"

There are lot of instructions, lots of features described-however I
am lost:

1. Do I have to run an own server to use jitsi-meet?

No, you can use someone else's deployment, e.g. https://meet.jit.si

2. Do I have to make a new installation (of which component?) each time
    I want to open a conference? According to the instruction below the
    host name has to be entered during installation. Confusing.
    At most I would make installations on host/servers once and leave
    them allone for unlimtted future use from persons that have the
    credentials.

No.

3. Also confusiong according to that instruction you only need to
    install jitsi-meet but no videobridge?

Correct. Why is it confusing?

4. Can others just use the conference without the person that
    originally organized it and made the installations?

Yes, depending on configuration.

5. Which servers (within the EU) are there where I can just open
    conferences?

https://meet.jit.si has servers located in EU, which will be used if
you open a conference from EU.

6. Which of them support video?

All of them.

7. Which pieces of software have to install those that just wish to
    join a conference?

They need one a WebRTC-capable browser (Chrome, Firefox, Chromium).

8. Which software has to install the person that organizes the
    conference - on which computer? In my opinion should be as easy as
    to open a new whatsappgroup.

No additional software required.

9. Is jitsi and/or jitsi-meet still alive? In the web I find a lot of
    stuff from 2014 and older that I am unsure if instructions given
    there are valid for the current releases.
    http://www.linux-magazin.de/Ausgaben/2015/12/Videokonferenzen (End
    2015) says that still improvement is needed. After such articles I
    would expect a reply in "News" or "Media" (Article in Media from
    2013! No updates after that).

They are both alive. I count 4150 commits this year for jitsi-meet
related projects.

10. Which restrictions are there from different browsers and operating
    systems? In my conferences individual persons come together that use
    mainly different windows, some Linux (Mint(Ubuntu)) like me,
    Browsers are the IE, Firefox and don't know what else. I want to
    transmit the webcam from all of them to all of us with audio and
    chat. Audio+video-chat all together is a must, encryption and
    support of mobile phones just a bonus.

https://meet.jit.si/unsupported_browser.html

I used instructions from
https://github.com/jitsi/jitsi-meet/blob/master/doc/quick-install.md
I am geek enough for hours of patience to fight through and understand
software that finally has to turn out as simple.
I want avoid Skype because of its horrible general terms and conditions,
servers under control of the NSA.
The people I support expect click-install-run. Installation has to be
straight-foreward or last not longer than 20 Min.

By "people" do you mean users of the system? They simply need to open
a link in their browser.

Regards,
Boris

_______________________________________________
users mailing list
users@jitsi.org
Unsubscribe instructions and other list options:
http://lists.jitsi.org/mailman/listinfo/users

--
Noch mehr Datenschutz:
Versucht https://www.startpage.com/ als
Suchmaschine
Startpage sammelt keine Daten, trackt Euch nicht und liefert Ergebnisse
ähnlich gut wie Google.
Startpage befreit Euch aus der "Filterblase".
und:
Mein Schlüssel:
http://pool.sks-keyservers.net/pks/lookup?op=vindex&fingerprint=on&search=0xB6696E4099865ACA

Try Linux!
(Berate gern zum Umstieg)


#4

Hi Boris,

thanks for your explanations. I am still impressed about the level of
discussion in users@jitsi.org. How even higher sophisticated must the
discussion be in the developpers mailing list. Embarrasingly there is
nobody with questions as simple as my questions - but I am still trying
to get jitsi running -

- I tried to open a conference and indeed seemingly a jitsi-meet window
openes when I entered
https://frank-thinkpad-t420/Trial in my Firefox.

1. But: Should I have entered "https://meet.jit.si" instead of
    "frank-thinkpad-t420" (which is my local computer) during installation?
2. Will others anyway be able to join a conference when I use
    "frank-thinkpad-t420"?
    (I can not imagine how that should work)
3. If not: How can I add or at least replace "frank-thinkpad-t420" by
    other hosts that allows others to access a conference?
    Whenever I tried to repeat the installation with another host name
    it says that jitsi meet already is installed and I found no
    instructions how to remove that installation to replace it by a
    correct one.
4. What happens if there are two groups that wish to open a conference
    of the same name using https://meet.jit.si/something?
5. Even if "frank-thinkpad-t420" was correct this denomination might be
    used by more than one user. What happens when these both open a
    conference?
6. However in the lower right corner there is a small window that says
    "me" but there is nothing shown from my webcam and in settings I
    can't select my webcam nor microphone - nothing. Pushing the camara
    icon does not help, neither.
7. Are all these settings only available after the choice of a correct
    host?
8. Do I have to start a conference before I can change these settings?
9. Is the use of a gravatar obligatory?
10. For which service, which server do I login using the Login-button
    under Autenticate in Profile?
11. How is encryption done when I and other participants only enter the
    url of the conference?
12. How is privacy assured?
13. Will the invited parties asked for a password?
14. Which password would that be?
15. As soon as I get a conference running with 3 participants working
    using different OS I could write step by step a german documentation
    for jitsi meet. Do you know where should I post it to? In which format?

Regards Frank

···

Am 23.12.2016 um 01:49 schrieb Boris Grozev:

Hi,

On 22/12/2016 18:13, Frank wrote:

Hi you "more-geeks-than-me"

There are lot of instructions, lots of features described-however I
am lost:

1. Do I have to run an own server to use jitsi-meet?

No, you can use someone else's deployment, e.g. https://meet.jit.si

2. Do I have to make a new installation (of which component?) each time
    I want to open a conference? According to the instruction below the
    host name has to be entered during installation. Confusing.
    At most I would make installations on host/servers once and leave
    them allone for unlimtted future use from persons that have the
    credentials.

No.

3. Also confusiong according to that instruction you only need to
    install jitsi-meet but no videobridge?

Correct. Why is it confusing?

4. Can others just use the conference without the person that
    originally organized it and made the installations?

Yes, depending on configuration.

5. Which servers (within the EU) are there where I can just open
    conferences?

https://meet.jit.si has servers located in EU, which will be used if
you open a conference from EU.

6. Which of them support video?

All of them.

7. Which pieces of software have to install those that just wish to
    join a conference?

They need one a WebRTC-capable browser (Chrome, Firefox, Chromium).

8. Which software has to install the person that organizes the
    conference - on which computer? In my opinion should be as easy as
    to open a new whatsappgroup.

No additional software required.

9. Is jitsi and/or jitsi-meet still alive? In the web I find a lot of
    stuff from 2014 and older that I am unsure if instructions given
    there are valid for the current releases.
    http://www.linux-magazin.de/Ausgaben/2015/12/Videokonferenzen (End
    2015) says that still improvement is needed. After such articles I
    would expect a reply in "News" or "Media" (Article in Media from
    2013! No updates after that).

They are both alive. I count 4150 commits this year for jitsi-meet
related projects.

10. Which restrictions are there from different browsers and operating
    systems? In my conferences individual persons come together that use
    mainly different windows, some Linux (Mint(Ubuntu)) like me,
    Browsers are the IE, Firefox and don't know what else. I want to
    transmit the webcam from all of them to all of us with audio and
    chat. Audio+video-chat all together is a must, encryption and
    support of mobile phones just a bonus.

https://meet.jit.si/unsupported_browser.html

I used instructions from
https://github.com/jitsi/jitsi-meet/blob/master/doc/quick-install.md
I am geek enough for hours of patience to fight through and understand
software that finally has to turn out as simple.
I want avoid Skype because of its horrible general terms and conditions,
servers under control of the NSA.
The people I support expect click-install-run. Installation has to be
straight-foreward or last not longer than 20 Min.

By "people" do you mean users of the system? They simply need to open
a link in their browser.

Regards,
Boris

_______________________________________________
users mailing list
users@jitsi.org
Unsubscribe instructions and other list options:
http://lists.jitsi.org/mailman/listinfo/users

--
Noch mehr Datenschutz:
Versucht https://www.startpage.com/ als
Suchmaschine
Startpage sammelt keine Daten, trackt Euch nicht und liefert Ergebnisse
ähnlich gut wie Google.
Startpage befreit Euch aus der "Filterblase".
und:
Mein Schlüssel:
http://pool.sks-keyservers.net/pks/lookup?op=vindex&fingerprint=on&search=0xB6696E4099865ACA

Try Linux!
(Berate gern zum Umstieg)


#5

Hi,

Hi Boris,

thanks for your explanations. I am still impressed about the level of
discussion in users@jitsi.org. How even higher sophisticated must the
discussion be in the developpers mailing list.

Well a video conference is a complicated topic and deploying sometimes
can be complicated.

Embarrasingly there is nobody
with questions as simple as my questions - but I am still trying to get
jitsi running -

- I tried to open a conference and indeed seemingly a jitsi-meet window
openes when I entered
https://frank-thinkpad-t420/Trial in my Firefox.

But: Should I have entered "https://meet.jit.si" instead of
"frank-thinkpad-t420" (which is my local computer) during installation?

No, this should be the domain name for you deployment.

Will others anyway be able to join a conference when I use
"frank-thinkpad-t420"?
(I can not imagine how that should work)

You need to register a domain name and set it up so it is pointed to
the ip address of the server where you have installed your jitsi-meet.

If not: How can I add or at least replace "frank-thinkpad-t420" by other
hosts that allows others to access a conference?

In order to use a name that is not resolvable using dns, you need to
go on every client that will use your deployment and edit his
/etc/hosts file and add an entry like:
1.2.3.4 frank-thinkpad-t420
Where 1.2.3.4 is the public address of your PC. Doing a deployment on
PC with a private address comes to setting up your router to forward
ports 10000-20000 UDP, 4443 and 443 TCP. And also setting up jvb to
know the public address of your router.

Whenever I tried to repeat the installation with another host name it says
that jitsi meet already is installed and I found no instructions how to
remove that installation to replace it by a correct one.

There are two options to reconfigure the debian packages or purge them
(using apt-get remove --purge and make sure there is no /etc/jitsi
folder).

What happens if there are two groups that wish to open a conference of the
same name using https://meet.jit.si/something?

They will enter in the same room.

Even if "frank-thinkpad-t420" was correct this denomination might be used by
more than one user. What happens when these both open a conference?
However in the lower right corner there is a small window that says "me" but
there is nothing shown from my webcam and in settings I can't select my
webcam nor microphone - nothing. Pushing the camara icon does not help,
neither.
Are all these settings only available after the choice of a correct host?
Do I have to start a conference before I can change these settings?
Is the use of a gravatar obligatory?

No this means your deployment has problems which you need to debug and
fix. When you have questions like that, you can always open
meet.jit.si and check how it behaves.

For which service, which server do I login using the Login-button under
Autenticate in Profile?

Not sure why you see this, but this must be configured, it can be your
xmpp server as well as google account, it can be used for several
features.

How is encryption done when I and other participants only enter the url of
the conference?

The transport between the web server and you is https, and the media
between every participant and the jvb is also encrypted. Search for
webrtc encryption.

How is privacy assured?
Will the invited parties asked for a password?

If you setup it by locking the room.

Which password would that be?

The one you setup.

As soon as I get a conference running with 3 participants working using
different OS I could write step by step a german documentation for jitsi
meet. Do you know where should I post it to? In which format?

Publishing it in some public blog will be ok and sending the link here
so people can look at it.

Cheers
damencho

···

On Fri, Dec 30, 2016 at 5:33 AM, Frank <IanMcBike@web.de> wrote:

Regards Frank

Am 23.12.2016 um 01:49 schrieb Boris Grozev:

Hi,

On 22/12/2016 18:13, Frank wrote:

Hi you "more-geeks-than-me"

There are lot of instructions, lots of features described-however I am lost:

1. Do I have to run an own server to use jitsi-meet?

No, you can use someone else's deployment, e.g. https://meet.jit.si

2. Do I have to make a new installation (of which component?) each time
    I want to open a conference? According to the instruction below the
    host name has to be entered during installation. Confusing.
    At most I would make installations on host/servers once and leave
    them allone for unlimtted future use from persons that have the
    credentials.

No.

3. Also confusiong according to that instruction you only need to
    install jitsi-meet but no videobridge?

Correct. Why is it confusing?

4. Can others just use the conference without the person that
    originally organized it and made the installations?

Yes, depending on configuration.

5. Which servers (within the EU) are there where I can just open
    conferences?

https://meet.jit.si has servers located in EU, which will be used if you
open a conference from EU.

6. Which of them support video?

All of them.

7. Which pieces of software have to install those that just wish to
    join a conference?

They need one a WebRTC-capable browser (Chrome, Firefox, Chromium).

8. Which software has to install the person that organizes the
    conference - on which computer? In my opinion should be as easy as
    to open a new whatsappgroup.

No additional software required.

9. Is jitsi and/or jitsi-meet still alive? In the web I find a lot of
    stuff from 2014 and older that I am unsure if instructions given
    there are valid for the current releases.
    http://www.linux-magazin.de/Ausgaben/2015/12/Videokonferenzen (End
    2015) says that still improvement is needed. After such articles I
    would expect a reply in "News" or "Media" (Article in Media from
    2013! No updates after that).

They are both alive. I count 4150 commits this year for jitsi-meet related
projects.

10. Which restrictions are there from different browsers and operating
    systems? In my conferences individual persons come together that use
    mainly different windows, some Linux (Mint(Ubuntu)) like me,
    Browsers are the IE, Firefox and don't know what else. I want to
    transmit the webcam from all of them to all of us with audio and
    chat. Audio+video-chat all together is a must, encryption and
    support of mobile phones just a bonus.

https://meet.jit.si/unsupported_browser.html

I used instructions from
https://github.com/jitsi/jitsi-meet/blob/master/doc/quick-install.md
I am geek enough for hours of patience to fight through and understand
software that finally has to turn out as simple.
I want avoid Skype because of its horrible general terms and conditions,
servers under control of the NSA.
The people I support expect click-install-run. Installation has to be
straight-foreward or last not longer than 20 Min.

By "people" do you mean users of the system? They simply need to open a link
in their browser.

Regards,
Boris

_______________________________________________
users mailing list
users@jitsi.org
Unsubscribe instructions and other list options:
http://lists.jitsi.org/mailman/listinfo/users

--
Noch mehr Datenschutz:
Versucht https://www.startpage.com/ als Suchmaschine
Startpage sammelt keine Daten, trackt Euch nicht und liefert Ergebnisse
ähnlich gut wie Google.
Startpage befreit Euch aus der "Filterblase".
und:
Mein Schlüssel:
http://pool.sks-keyservers.net/pks/lookup?op=vindex&fingerprint=on&search=0xB6696E4099865ACA
Try Linux!
(Berate gern zum Umstieg)

_______________________________________________
users mailing list
users@jitsi.org
Unsubscribe instructions and other list options:
http://lists.jitsi.org/mailman/listinfo/users


#6

Hi Frank,

See inline.

Hi Boris,

thanks for your explanations. I am still impressed about the level of
discussion in users@jitsi.org. How even higher sophisticated must the
discussion be in the developpers mailing list. Embarrasingly there is
nobody with questions as simple as my questions - but I am still trying
to get jitsi running -

- I tried to open a conference and indeed seemingly a jitsi-meet window
openes when I entered
https://frank-thinkpad-t420/Trial in my Firefox.

1. But: Should I have entered "https://meet.jit.si" instead of
    "frank-thinkpad-t420" (which is my local computer) during installation?

You should not enter meet.jit.si. Choosing the domain is up to you. Using a local hostname might work for testing purposes, but will probably not work over the internet.

2. Will others anyway be able to join a conference when I use
    "frank-thinkpad-t420"?
    (I can not imagine how that should work)

I don't think so.

3. If not: How can I add or at least replace "frank-thinkpad-t420" by
    other hosts that allows others to access a conference?
    Whenever I tried to repeat the installation with another host name
    it says that jitsi meet already is installed and I found no
    instructions how to remove that installation to replace it by a
    correct one.

I don't know.

4. What happens if there are two groups that wish to open a conference
    of the same name using https://meet.jit.si/something?
5. Even if "frank-thinkpad-t420" was correct this denomination might be
    used by more than one user. What happens when these both open a
    conference?

Conferences are identified by the name (i.e. "something"), so they will end up in the same conference.

6. However in the lower right corner there is a small window that says
    "me" but there is nothing shown from my webcam and in settings I
    can't select my webcam nor microphone - nothing. Pushing the camara
    icon does not help, neither.

You will need to debug further, look at the java script console logs for example. Make sure that you allow the application access to the microphone and camera when it asks for it while initially loading.

7. Are all these settings only available after the choice of a correct
    host?
8. Do I have to start a conference before I can change these settings?

I don't understand what setting you are referring to.

9. Is the use of a gravatar obligatory?

No, you can replace it with another service by using these two properties:
https://github.com/jitsi/jitsi-meet/blob/master/interface_config.js#L56

10. For which service, which server do I login using the Login-button
    under Autenticate in Profile?

I don't understand the question.

11. How is encryption done when I and other participants only enter the
    url of the conference?
12. How is privacy assured?

See here: https://github.com/jitsi/jitsi-meet/issues/409

13. Will the invited parties asked for a password?
14. Which password would that be?

No, unless you explicitly set a password for the room (you can do that after pressing the "share the link" button on top).

15. As soon as I get a conference running with 3 participants working
    using different OS I could write step by step a german documentation
    for jitsi meet. Do you know where should I post it to? In which format?

Thank you for the willingness to contribute to our project! I'm not sure what the best way would be. With the projects changing quite quickly, our original documentation is often a bit behind. I don't think our team would be able to maintain documentation and provide any help in another language (and one which almost none of us speak). That being said, if you post a tutorial somewhere online we could link to it as an additional resource.

Regards,
Boris

···

On 30/12/2016 05:33, Frank wrote:

Regards Frank

Am 23.12.2016 um 01:49 schrieb Boris Grozev:

Hi,

On 22/12/2016 18:13, Frank wrote:

Hi you "more-geeks-than-me"

There are lot of instructions, lots of features described-however I
am lost:

1. Do I have to run an own server to use jitsi-meet?

No, you can use someone else's deployment, e.g. https://meet.jit.si

2. Do I have to make a new installation (of which component?) each time
    I want to open a conference? According to the instruction below the
    host name has to be entered during installation. Confusing.
    At most I would make installations on host/servers once and leave
    them allone for unlimtted future use from persons that have the
    credentials.

No.

3. Also confusiong according to that instruction you only need to
    install jitsi-meet but no videobridge?

Correct. Why is it confusing?

4. Can others just use the conference without the person that
    originally organized it and made the installations?

Yes, depending on configuration.

5. Which servers (within the EU) are there where I can just open
    conferences?

https://meet.jit.si has servers located in EU, which will be used if
you open a conference from EU.

6. Which of them support video?

All of them.

7. Which pieces of software have to install those that just wish to
    join a conference?

They need one a WebRTC-capable browser (Chrome, Firefox, Chromium).

8. Which software has to install the person that organizes the
    conference - on which computer? In my opinion should be as easy as
    to open a new whatsappgroup.

No additional software required.

9. Is jitsi and/or jitsi-meet still alive? In the web I find a lot of
    stuff from 2014 and older that I am unsure if instructions given
    there are valid for the current releases.
    http://www.linux-magazin.de/Ausgaben/2015/12/Videokonferenzen (End
    2015) says that still improvement is needed. After such articles I
    would expect a reply in "News" or "Media" (Article in Media from
    2013! No updates after that).

They are both alive. I count 4150 commits this year for jitsi-meet
related projects.

10. Which restrictions are there from different browsers and operating
    systems? In my conferences individual persons come together that use
    mainly different windows, some Linux (Mint(Ubuntu)) like me,
    Browsers are the IE, Firefox and don't know what else. I want to
    transmit the webcam from all of them to all of us with audio and
    chat. Audio+video-chat all together is a must, encryption and
    support of mobile phones just a bonus.

https://meet.jit.si/unsupported_browser.html

I used instructions from
https://github.com/jitsi/jitsi-meet/blob/master/doc/quick-install.md
I am geek enough for hours of patience to fight through and understand
software that finally has to turn out as simple.
I want avoid Skype because of its horrible general terms and conditions,
servers under control of the NSA.
The people I support expect click-install-run. Installation has to be
straight-foreward or last not longer than 20 Min.

By "people" do you mean users of the system? They simply need to open
a link in their browser.

Regards,
Boris

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