Shell-Script für den Download von lecture2go-Videos, welches nicht nur die Möglichkeit bietet, Videos im Terminal anstatt im Browser herunterzuladen, sondern auch den Download von ganzen Vorlesungsreihen sowie von nicht offiziell zum Download freigegebenen Videos ermöglicht.
Das Skript kann mithilfe von "alias" referenziert werden, wodurch es sich wie ein installiertes Programm verhält. Das Speichern der heruntergeladenen Videos erfolgt im aktuellen Arbeitsverzeichnis.
Usage: ./l2gDownloader.sh [-(va) URL [-p PASSPHRASE] [-i TOKEN] [-r] [-c] [-m] [-s RANGE]]
Options:
-v URL Download a video.
-a URL Download all videos of a lecture series of which the given url belongs to.
-p PASSPHRASE Add passphrase for protected lecture series.
-i TOKEN Add authentification token for protected lecture series.
-s RANGE Specify a range of videos to download. Useless if combined with -v.
-c Compute MD5 checksum of the video file, add it to the file name
-r Download videos in reverse order: n --> 1 instead of 1 --> n (default behaviour). Useless if combined with -v.
-m Additionally convert video to audio track after downloading (requires ffmpeg).
Examples:
./l2gDownloader.sh -v https://lecture2go.uni-hamburg.de/l2go/-/get/l/4774
Download a single video.
./l2gDownloader.sh -a https://lecture2go.uni-hamburg.de/l2go/-/get/l/4774
Download all videos of this lecture series.
./l2gDownloader.sh -a https://lecture2go.uni-hamburg.de/l2go/-/get/l/4774 -s 2-3,7-9,1
Download videos from 2 to 3, from 7 to 9, and video 1 of this lecture series.
./l2gDownloader.sh -a https://lecture2go.uni-hamburg.de/l2go/-/get/l/4774 -s 1,2,8-
Download videos 1, 2, and from 8 to end of this lecture series.
./l2gDownloader.sh -a https://lecture2go.uni-hamburg.de/l2go/-/get/l/4774 -s -5,10-15
Download videos from beginning to 5, and from 10 to 15 of this lecture series.
./l2gDownloader.sh -v https://lecture2go.uni-hamburg.de/l2go/-/get/v/YYsL1MJFLmnX8bTchn0m7wxx -p GDBWS1617
Download a single video with given passphrase.
./l2gDownloader.sh -a https://lecture2go.uni-hamburg.de/l2go/-/get/v/YYsL1MJFLmnX8bTchn0m7wxx -p GDBWS1617
Download all videos of this lecture series with given passphrase.
./l2gDownloader.sh -v https://lecture2go.uni-hamburg.de/l2go/-/get/l/4774 -rc
or
./l2gDownloader.sh -v https://lecture2go.uni-hamburg.de/l2go/-/get/l/4774 -c -r
Download all videos of this lecture series in reverse order, compute add checksums to file name.
Limitations:
It's not possible to download several single videos or several lecture series in a single execution of the script.
It's not possible to download just the newly added videos from a lecture series.
It's not possible to view the download progress.
It's not possible to continue canceled downloads.
It's not possible to save the downloaded videos into another directory.
It's not possible to save already used passphrases to a file and try to use them next time automatically.
I will adress some of these limitations in the future.
Dependencies:
curl, getopts, md5sum, stat, grep, sed, head, cat, tac, ...
All used commands and programs should already be available in every linux environment. It's also possible to run
this script under Windows inside the Cygwin terminal.
Optinal Dependencies:
ffmpeg
ffmpeg is needed to extract the audio track from the video file. You don't need to install ffmpeg unless you want to
use this feature.
About:
l2gDownloader has been developed in October/November 2016. It's working for almost any video at the moment,
however this might change over time. If you're experiencing problems, please contact me (include url), maybe I will
fix it.
Die einzelnen Video-Fragmente werden mit curl heruntergeladen und aneinandergehängt. Dabei kann es vorkommen, dass bei einzelnen Fragmente ein Verbindungs-Timeout auftritt und ein paar Sekunden im Video fehlen (wodurch sich wiederum zwei Video-Dateien unterscheiden können, obwohl sie eigentlich vollkommen identisch sein sollten). Dies tritt häufiger bei instabilen Internetverbindungen auf, sollte aber bei normalen Verbindungen vernachlässigbar selten anzutreffen sein.
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