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diff --git a/emacsconf-extract.el b/emacsconf-extract.el
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+;;; emacsconf-extract.el --- BigBlueButton               -*- lexical-binding: t; -*-
+
+;; Copyright (C) 2022  Sacha Chua
+
+;; Author: Sacha Chua <sacha@sachachua.com>
+
+
+;; This program is free software; you can redistribute it and/or modify
+;; it under the terms of the GNU General Public License as published by
+;; the Free Software Foundation, either version 3 of the License, or
+;; (at your option) any later version.
+
+;; This program is distributed in the hope that it will be useful,
+;; but WITHOUT ANY WARRANTY; without even the implied warranty of
+;; MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
+;; GNU General Public License for more details.
+
+;; You should have received a copy of the GNU General Public License
+;; along with this program.  If not, see <https://www.gnu.org/licenses/>.
+
+;;; Commentary:
+
+;;; Code:
+
+(defun emacsconf-extract-extract-chat (filename)
+	(when (file-exists-p filename)
+		(message "%s" filename)
+		(mapcar
+		 (lambda (node)
+			 (when (string= (dom-attr node 'target) "chat")
+				 (let ((message
+								(replace-regexp-in-string
+								 "\\[<u>\\([^<]+\\)?</u>\\](\"\\([^<]+\\)\")"
+								 "<\\2>"
+								 (condition-case nil
+										 (html-to-markdown-string (dom-attr node 'message))
+									 (error
+										(replace-regexp-in-string
+										 "<a href=\"\\(.+?\\)\" rel=\"nofollow\"><u>\\(.+?\\)</u></a>"
+										 "<\\2>"
+										 (dom-attr node 'message)))))))
+					 (list (string-to-number (dom-attr node 'in)) (dom-attr node 'name) message))))
+		 (dom-by-tag (xml-parse-file filename) 'chattimeline))))
+;; (emacsconf-extract-extract-chat (expand-file-name "bbb-playbacks/haskell/slides_new.xml" emacsconf-cache-dir)) 
+
+(defvar emacsconf-extract-bbb-chat-use-wall-clock-time nil
+	"Non-nil means use wall clock time for logs.")
+(defun emacsconf-extract-chats ()
+	(interactive)
+	(mapc (lambda (o)
+					(let* ((playback-dir (expand-file-name (plist-get o :slug)
+																								 (expand-file-name "bbb-playbacks" emacsconf-cache-dir)))
+								 (chat
+									(emacsconf-extract-extract-chat 
+									 (expand-file-name
+										"slides_new.xml"
+										playback-dir)))
+								 metadata)
+						(when chat
+							(setq metadata (xml-parse-file (expand-file-name "metadata.xml"
+																															 playback-dir)))
+							(let ((recording-start (/ (string-to-number (dom-text
+																													 (dom-by-tag metadata 'start_time)))
+																				1000)))
+								(with-temp-file (expand-file-name (concat (plist-get o :video-slug) "--extract.txt")
+																									emacsconf-cache-dir)
+									(insert
+									 (mapconcat
+										(lambda (line)
+											(format "`%s` _%s_ %s  \n"
+															(if emacsconf-extract-bbb-chat-use-wall-clock-time
+																	(format-time-string "%H:%M:%S"
+																											(seconds-to-time
+																											 (+ recording-start
+																													(elt line 0))))
+																(format-seconds "%h:%.2m:%.2s"
+																								(elt line 0)))
+															(elt line 1)
+															(elt line 2)))
+										chat
+										"")))))))
+				(emacsconf-prepare-for-display (emacsconf-get-talk-info))))
+
+(defun emacsconf-extract-bbb-copy-files ()
+	(interactive)
+	(mapc
+	 (lambda (o)
+		 (let ((playback-dir (expand-file-name (plist-get o :slug)
+																					 (expand-file-name "bbb-playbacks" emacsconf-cache-dir))))
+			 (mapc (lambda (file)
+							 (when (and (file-exists-p (expand-file-name file playback-dir))
+													(not (file-exists-p (expand-file-name (concat (plist-get o :video-slug) "--bbb-" file) emacsconf-cache-dir))))
+								 (copy-file (expand-file-name file playback-dir)
+														(expand-file-name (concat (plist-get o :video-slug) "--bbb-" file) emacsconf-cache-dir)
+														t)))
+						 '("webcams.webm" "metadata.xml" "deskshare.webm" "deskshare.xml" "slides_new.xml" "webcams.opus"))))
+	 (emacsconf-prepare-for-display (emacsconf-get-talk-info))))
+
+
+(provide 'emacsconf-extract)
+;;; emacsconf-extract.el ends here