├── .gitignore ├── LICENSE ├── README.md └── main.py /.gitignore: -------------------------------------------------------------------------------- 1 | /parts.txt 2 | -------------------------------------------------------------------------------- /LICENSE: -------------------------------------------------------------------------------- 1 | GNU LESSER GENERAL PUBLIC LICENSE 2 | Version 3, 29 June 2007 3 | 4 | Copyright (C) 2007 Free Software Foundation, Inc. 5 | Everyone is permitted to copy and distribute verbatim copies 6 | of this license document, but changing it is not allowed. 7 | 8 | 9 | This version of the GNU Lesser General Public License incorporates 10 | the terms and conditions of version 3 of the GNU General Public 11 | License, supplemented by the additional permissions listed below. 12 | 13 | 0. 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Revised Versions of the GNU Lesser General Public License. 145 | 146 | The Free Software Foundation may publish revised and/or new versions 147 | of the GNU Lesser General Public License from time to time. Such new 148 | versions will be similar in spirit to the present version, but may 149 | differ in detail to address new problems or concerns. 150 | 151 | Each version is given a distinguishing version number. If the 152 | Library as you received it specifies that a certain numbered version 153 | of the GNU Lesser General Public License "or any later version" 154 | applies to it, you have the option of following the terms and 155 | conditions either of that published version or of any later version 156 | published by the Free Software Foundation. If the Library as you 157 | received it does not specify a version number of the GNU Lesser 158 | General Public License, you may choose any version of the GNU Lesser 159 | General Public License ever published by the Free Software Foundation. 160 | 161 | If the Library as you received it specifies that a proxy can decide 162 | whether future versions of the GNU Lesser General Public License shall 163 | apply, that proxy's public statement of acceptance of any version is 164 | permanent authorization for you to choose that version for the 165 | Library. -------------------------------------------------------------------------------- /README.md: -------------------------------------------------------------------------------- 1 | # How to use 2 | Run python script with one parameter. The parameter should be the watch presentation link BBB gave you. 3 | 4 | Output will be a list of commands to enter in your terminal. If you run all those commands, the webcam recording will be downloaded (because it contains the audio), then the shapes.svg file will be downloaded which contains positions and URLs of the slides, then the slides will be downloaded, and a video file will be created for each slide. The slides will then be concatenated and merged with the audio, which is extracted, to a file called __final.mp4__. 5 | 6 | Because of a bug in BBB which creates a wrong time for the last slide, you need to edit the last video creation command to use the right time. You need to figure out yourself how long the last slide should be displayed. 7 | 8 | ## Example usage 9 | ```bash 10 | python3 main.py https://example.org/playback/presentation/2.3/123a4-123 > commands.sh 11 | # now edit the third line from the bottom in commands.sh 12 | # to make the -t parameter use the right length 13 | # like ffmpeg -loop 1 -i image30.png -c:v libx264 -t 70 -pix_fmt yuv420p -r 15.000150 image30.mp4 14 | # where 70 means 70 seconds 15 | bash commands.sh 16 | ``` 17 | 18 | # Notes 19 | 20 | Note that while the files will be small, video will still be actually rendered, so the process needs quite a lot of computing power or time. For 70 minutes of recording it took me 10 minutes on a medium 2020 PC. If your internet connection is not fast, that time needs to be added, too. 21 | 22 | BBB sources are roughly 2 MB / minute for the audio and webcam and 500 KB per slide (can vary depending on the amount of webcams displayed). 23 | 24 | # Requirements 25 | This script is meant to be run on Linux. The commands require ffmpeg and wget. 26 | 27 | A text file will be written to the directory of this script as an input for the concetanation so this script needs to be placed in a writable directory. 28 | 29 | # Source 30 | https://github.com/Konzertheld/bbb-slides-video-python 31 | -------------------------------------------------------------------------------- /main.py: -------------------------------------------------------------------------------- 1 | import os 2 | import sys 3 | import urllib3 4 | import xml.etree.ElementTree as ET 5 | http = urllib3.PoolManager() 6 | 7 | if len(sys.argv) > 1: 8 | # TODO: check if begins with http etc 9 | url_parts = sys.argv[1].split('/') 10 | base_url = '/'.join(url_parts[0:3]) 11 | 12 | # check BBB version 13 | if "/2.0/" in sys.argv[1]: 14 | bbb_id = url_parts[len(url_parts) - 1].split('=')[1] 15 | elif "/2.3/" in sys.argv[1]: 16 | bbb_id = url_parts[len(url_parts) - 1] 17 | else: 18 | print("WARNING unsupported version") 19 | exit(1) 20 | 21 | shapes_url = base_url + "/presentation/" + bbb_id + "/shapes.svg" 22 | r = http.request('GET', shapes_url) 23 | if r.status == 404: 24 | print("WARNING 404") 25 | exit(2) 26 | shapes = r.data.decode('utf-8') 27 | shapes_xml_root = ET.fromstring(shapes) 28 | print("wget " + base_url + "/presentation/" + bbb_id + "/video/webcams.webm") 29 | print("ffmpeg -i webcams.webm -vn -c:a copy audio.ogg") # read webcams write no video use same audio codec 30 | with open(os.getcwd() + '/parts.txt', 'w') as f: 31 | for child in shapes_xml_root: 32 | if 'image' in child.tag: # this ignores polls, drawn elements etc 33 | start_str = child.attrib["in"].split(".")[0] 34 | end_str = child.attrib["out"].split(".")[0] 35 | print("wget " + base_url + "/presentation/" + bbb_id + "/" + child.attrib['{http://www.w3.org/1999/xlink}href'] + " -O " + child.attrib["id"] + ".png") 36 | print("ffmpeg -loop 1 -i " + child.attrib["id"] + ".png -c:v libx264 -t " + str(int(end_str) - int(start_str)) + " -pix_fmt yuv420p -r 15.000150 " + child.attrib[ 37 | "id"] + ".mp4") # read image write using H264 use duration from shapes file, use frame rate from webcam file 38 | f.writelines(["file '" + child.attrib["id"] + ".mp4'\n"]) 39 | 40 | print("ffmpeg -f concat -safe 0 -i " + os.getcwd() + "/parts.txt -c copy slides.mp4") # read list from file, use same codecs 41 | print("ffmpeg -i slides.mp4 -i audio.ogg -c copy final.mp4") # read video-only and audio-only, output using same codec 42 | else: 43 | print("No argument supplied, call with BBB URL") 44 | --------------------------------------------------------------------------------