I am using website https://bitmovin.com/demos/drm to test and learn.
The site requests 11331.mpd file and gets back information about 5 different resolution video streams and 1 audio. All with the same KID eb676abb-cb34-5e96-bbcf-616630f1a3da. It then proceeds requesting init.mp4 file and follows with requests segment_0.m4s where 0 gets increased by 1 for each of the following requests.
Here is my first question: Where in the mpd file do I see how many segments are available? Is that information even included or it stops only when server stops responding with proper replies?
If I understand this correctly, I should be able to concatenate initialization mp4 file and all of the segments into a mp4 file, which would then also need to be decrypted. For example with ffmpeg.
Passing the path to 11331.mpd to youtube-dl does not work on this page, although I am sure this did work for me in the past on other sites. mpd xml file also seem to be way more obfuscated than the m3u8 files.
For example: how does one parse the information like this:
<cenc:pssh xmlns:cenc="urn:mpeg:cenc:2013">AAAAW3Bzc2gAAAAA7e+LqXnWSs6jyCfc1R0h7QAAADsIARIQ62dqu8s0Xpa7z2FmMPGj2hoNd2lkZXZpbmVfdGVzdCIQZmtqM2xqYVNkZmFsa3IzaioCSEQyAA==</cenc:pssh>
It looks like base64 encoded but trying to decode it does not return readable data (parts of it are readable). Which could mean part of the data returned does not have readable ascii representation. In that case, how to properly cut this up AAAAW3Bzc2gAAAAA7e+LqXnWSs6jyCfc1R0h7QAAADsIARIQ62dqu8s0Xpa7z2FmMPGj2hoNd2lkZXZpbmVfdGVzdCIQZmtqM2xqYVNkZmFsa3IzaioCSEQyAA== to extract the readable data, and what data is hidden (binary) in unreadable places?
