[FFmpeg-user] How can I extract m3u8 URL for use with ffmpeg on this site?

[Bo Berglund]

On Sat, 16 Apr 2022 15:04:02 +0200, Reino Wijnsma <rwijnsma at xs4all.nl> wrote:

>...you can see that the m3u8-url for the HLS manifest is only valid for 2 minutes (1650113048 - 1650112928 = 120).
>The m3u8-url for the individual videostreams on the other hand is valid for 24 hours (1650113048 - 1650199328 = 86400 / 60 / 60 = 24).

I just found this out with the help of my cron job trying to deduce the lifetime
of the m3u8 retrieved via Firefox interaction. Turns out I had to wait almost 24
hours since I created the URL in Firefox before the alarm triggered.

As you say it seems to live for 24 hours.
In this URL:
https://nbcnews3.akamaized.net/hls/live/723429/NBCNewsNowa418c506/clear/hdntl=exp=1650232874~acl=%2f*~data=hdntl~hmac=2f327aa18ebec99f42654f1f6018ef74e98f12ba085743535ca3d6fb6677c7aa/VIDEO_1_4596000.m3u8

One can see an item 'exp=1650232874', where the number seems to be seconds since
1970. That is the base of timekeeping on Linux, right?

date +%s   gives the seconds since the 1970.

And when I extract an M3U8 URL in Firefox at a certain time and subtract the
value given by the cmd 'date +%s' it returns 86400 +/- change, so the URL
lifetime is in fact 24 hours.

I tried to manually enter a new bigger value for the exp= item to see if it
could be extended to 48 hours but it did not work...
It returned an error when used with ffmpeg.


-- 
Bo Berglund
Developer in Sweden