Youtube reverse playlist script

it looks like YouTube doesn't support it, but it can be done:

first, you need to get all IDs from that sorted range (I copy/pasted source code into google spreadsheet and filtered it out)

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then just copy this list and paste it into http://roll.io/

press Run my list! button and you are good to watch

and as for downloading: https://www.youtube.net/channel.php?id

ADDITIONAL DETAILS:

source code in a spreadsheet: https://docs.google.com/spreadsheets/d/

chronologically sorted playlist: http://roll.io/#4U2pNU!0

this will download all video files in chronological order in format 00001-Title.mp4 etc. here are supported options: https://pastebin.com/raw/XGh82hg8 and there are more format options: https://pastebin.com/raw/fgqQbpRC also its possible to feed your desktop media player directly like: youtube-dl.exe -o - -a feed.txt | PotPlayerMini64.exe -

and also there is a possibility to download all IDs with:
youtube-dl.exe --get-id https://www.youtube.com/user/numberphile/ > t.txt
and ditch all that ID scraping from source code (note that then you need to open t.txt file with Word/Wordpad, because notepad will show it format-less in one string)

get list of IDs either with youtube-dl.exe or from source code
copy/paste it into google spreadsheet and create comma-separated list (ID,ID,ID...)
you can use =JOIN(",";A1:A) (as shown in A1)
then add the lead to it: ="https://www.youtube.com/watch_videos?video_ids="&A1 (as shown in A4)
copy cell A4, paste it into browser's search box and hit ENTER
this will create special playlist URL called "Untitled Playlist" where you will have chronologicaly sorted videos
https://www.youtube.com/watch?v=Muc5HQonSEo&list=TLGGiqkpBaB_k8UwNTA3MjAxOA

SIDE NOTE: unfortunately there is one downside... such playlist is limited only to 50 videos

to save such playlist, be sure that you are logged in into youtube
add &disable_polymer=true at the end of the URL and hit ENTER
https://www.youtube.com/watch?v=Muc5HQonSEo&list=TLGGiqkpBaB_k8UwNTA3MjAxOA&disable_polymer=true
then, somewhere around Subscribe button will appear + Add to button (or 3-dot/3-slash button with plus sign)
select Create a new playlist name it and press Create button
done!

there is also API approach, that can maybe handle 50+ videos (but that's not fun):
https://developers.google.com/youtube/v3/docs/playlists/insert#examples
or also AHK (AutoHotKey - https://www.autohotkey.com/ ) script:

;;;Select youtube videos with clipboard to create a playlist. Use CTRL + Y when finished. ;Below allows script to start with clipboard empty clipboard = ; Empty the clipboard ;Define playlist string playlist = http://www.youtube.com/watch_videos?video_ids= Msgbox Use clipboard to select videos. `nUse CNTL + Y when done selecting videos. `nCNTL + Z exits the script. #Persistent OnClipboardChange("ClipChanged") return ClipChanged(Type) { if clipboard contains youtube.com/watch,youtube.com/embed/,youtu.be { StringRight, clipboard, clipboard, 11 ; Removes all but last 11 characters gosub, doit return } return } doit: count++ playlist = %playlist%%clipboard%, TrayTip, Current Playlist:, %playlist% `nNumber of Videos: %count%`nUse CNTL + Y when done selecting videos ... Sleep 2000 TrayTip ; Turn off the tip. return ^y:: ;Remove last comma, display playlist, and copy playlist to clipboard StringTrimRight, playlist2, playlist, 1 ;Replace last comma with blank (also converts the clipboard to plain text). clipboard = %playlist2% ;Turn off OnClipboardChange OnClipboardChange("ClipChanged", 0) Msgbox Number of Videos in playlist: %count% `n%playlist2% `nPlaylist copied to clipboard `n`nUse CNTL + Z to exit ... ;Turn OnClipboardChange on again (necessary to keep Clipboard from aquiring playlist2) OnClipboardChange("ClipChanged", 1) return ^z:: ExitApp

add browser extension: firefox / chrome
select area with your mouse from where extension will extract all URL links
after selecting area / text with right-click-mouse-drag, click on extension icon and perform desired operation

here I wrote a simple spreadsheet playlist generator: https://docs.google.com/spreadsheets/d/
just add youtube links in any desired order and press that red text in cell B1