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How to use the "[Video links:]" blocks in the "intro"s of eev

This is 15-min long video - that I recorded in 2021may12 - that explains how to use the "[Video links:]" blocks that now appear in lots of places in the sandboxed tutorials of eev - for example, here:

http://angg.twu.net/eev-intros/find-eev-quick-intro.html#6
http://angg.twu.net/eev-intros/find-eev-quick-intro.html#7.3

Here are:

The video itself,
  (find-eevvlinksvideo "0:00")
  http://www.youtube.com/watch?v=xQqWufQgzVY
  http://angg.twu.net/eev-videos/2021-video-links.mp4

An index of the video:
(find-eevvlinksvideo  "0:00")
(find-eevvlinksvideo  "0:42" "pandemic -> shorter attention spans")
(find-eevvlinksvideo  "1:07" "Let's start the technical part")
(find-eevvlinksvideo  "1:14"   "remember that the tutorials are sexps like")
(find-eevvlinksvideo  "1:27"   "one of the main keys for beginners is M-j")
(find-eevvlinksvideo  "1:32"   "M-j explains that you can... M-5 M-j")
(find-eevvlinksvideo  "1:44"   "I'm going to explain how to use these blocks")
(find-eevvlinksvideo  "2:10" "If we open this tutorial in a browser")
(find-eevvlinksvideo  "2:33"   "each line has two hyperlinks")
(find-eevvlinksvideo  "2:38"   "the second one goes to the video")
(find-eevvlinksvideo  "3:41"   "the first links go to help")
(find-eevvlinksvideo  "3:59"   "let's try to go to help")
(find-eevvlinksvideo  "4:18"   "it ends with this mysterious paragraph")
(find-eevvlinksvideo  "5:05" "Here we have a copy of these blocks")
(find-eevvlinksvideo  "5:11"   "if I execute this `find-eevnavvideo'")
(find-eevvlinksvideo  "5:26"   "the second line plays the local copy")
(find-eevvlinksvideo  "6:00"   "the last line says `Local file found'")
(find-eevvlinksvideo  "6:09"   "if I execute this `find-eevtestblsvideo'")
(find-eevvlinksvideo  "6:15"   "the last line says `Local file NOT found'")
(find-eevvlinksvideo  "6:57" "We need to run this eepitch block")
(find-eevvlinksvideo  "7:14"   "If you need help: (find-psne-intro)")
(find-eevvlinksvideo  "7:35"   "(eepitch-shell) creates a target buffer")
(find-eevvlinksvideo  "8:05" "Now that I have a local copy")
(find-eevvlinksvideo  "8:08"   "this `find-eevvideo' sexp is going to work")
(find-eevvlinksvideo  "8:20"   "the last line says `Local file found'")
(find-eevvlinksvideo  "8:35" "To follow a `find-eev*video' sexp in Emacs")
(find-eevvlinksvideo  "8:44"   "if we already have the local copy")
(find-eevvlinksvideo  "8:44"   "the sexp in the second line plays it")
(find-eevvlinksvideo  "8:53"   "if we don't have the local copy")
(find-eevvlinksvideo  "8:58"   "message at the end of the buffer")
(find-eevvlinksvideo  "9:21" "Sections 1, 2, 3")
(find-eevvlinksvideo  "9:37" "Something that I forgot to explain")
(find-eevvlinksvideo  "9:58"   "middle of the temporary buffer")
(find-eevvlinksvideo "10:04"   "URL of the .mp4 file")
(find-eevvlinksvideo "10:15"   "the directory with local copies")
(find-eevvlinksvideo "10:28"   "youtube URL")
(find-eevvlinksvideo "10:44"   "youtube URL: follow with M-x brg")
(find-eevvlinksvideo "11:17" "Advanced features")
(find-eevvlinksvideo "11:42"   "source code of `find-eev2020video'")
(find-eevvlinksvideo "12:02"   "(find-efunction 'find-eev2020video)")
(find-eevvlinksvideo "13:15"   "I changed my mind, let me show")
(find-eevvlinksvideo "13:30"   "M-e <down> M-e")
(find-eevvlinksvideo "13:44"   "M-e <down> M-e")
(find-eevvlinksvideo "13:52"   "to play the video straight away")
(find-eevvlinksvideo "14:07"   "redefine: section in the tutorial")
(find-eevvlinksvideo "14:25"   "this sexp redefines")
(find-eevvlinksvideo "14:31"   "instead of creating a temp buffer")

A link to this page:
  http://angg.twu.net/2021-video-links.html

The "script" of the video:
  (find-angg "elisp/video-links-2021.el")

How I adjust the time offsets:
  (find-audiovideo-intro "2. `eev-avadj-mode'")

Announcements:
https://lists.gnu.org/archive/html/emacs-devel/2021-05/msg00527.html
https://www.reddit.com/r/emacs/comments/nb7gwj/how_to_use_the_video_links_blocks_in_the_intros/
https://lists.gnu.org/archive/html/hyperbole-users/2021-05/msg00039.html