Initial release

README.md

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+```
+Kalturadl
+=========
+
+Download and compress lecture videos from Kaltura on Canvas
+
+Right-click the video and select "Inspect" or press Ctrl + Shift + I. Go to
+the "Network" tab. Play the video for 1-2 seconds, then pause it. Copy the
+"index.m3u8" URL from the Network tab.
+
+Download the video: `bash dlm3u8.sh <m3u8_url> <output.mkv>`
+
+Compress the video to 480p: `ffmpeg -i <input.mkv> -vf "scale=-1:480" -c:v 
+libvpx-vp9 -crf 30 -b:v 0 -cpu-used 4 -c:a aac -b:a 128k <output.mkv>`
+
+Archive all videos and course materials into a single file: `tar -cvpf -
+<course_folder>/ | zstd -3 -o "<course_name>_$(date +'%Y%m%d_%H%M%S').tar.
+zst"`
+```

archive.txt

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+tar -cvpf - cs101/ | zstd -3 -o "cs101_$(date +'%Y%m%d_%H%M%S').tar.zst"

compress.txt

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+ffmpeg -i input.mkv -vf "scale=-1:480" -c:v libvpx-vp9 -crf 30 -b:v 0 -cpu-used 4 -c:a aac -b:a 128k output.mkv

dlm3u8.sh

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+#!/usr/bin/env bash
+if [ "$#" -ne 2 ] ; then
+    echo "USAGE: $0 <m3u8_url> <output.mkv>"; exit
+fi
+base=$(echo "$1" | rev | cut -d'/' -f2- | rev)
+curl -s "$1" | grep -v "^#" | sed -e "s>^>$base/>" | xargs curl -s | ffmpeg -i pipe:0 -c:v copy -c:a copy "$2"