**External links are only visible to Support Staff****External links are only visible to Support Staff**
ffmpeg also seems to struggle when using the m3u8 file. You're right, the Dropbox site is pretty flaky. And ffmpeg only pulls audio and video separately.
Workaround:
I did also find that if I provide the .m4v URLs to yt-dlp, it was able to download the videos with audio. That seems adequate to me for now. After rendering the page, using a bit of JS on the browser console let me get the list of videos on the page, newline separated:
Code:
var w = window.open("");
w.document.write("<table><thead><th>Links<tbody>");
for(var x of document.querySelectorAll("a"))
w.document.write( "<tr><td>"+x.href);