Issues while playing a m3u8

[Dreamkey]

Hello, I'm trying to play a live webcam through VLC instead of its website.
For example this one: https://www.whatsupcams.com/en/webcams/ ... skicenter/

I already fixed the file, it was containing only the relative fragment path:

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FILE=`mktemp` URL=https://cdn-003.whatsupcams.com/hls/dk_hedeland01.m3u8 USER_AGENT='Mozilla/5.0 (Linux x86_64; rv:78.0) Gecko/20100101 Firefox/78.0' wget -q -U $USER_AGENT -N $URL -O $TMP_FILE sed -i "s#^\([^#].*ts\)#$(dirname $URL)/\1#" $FILE

Then I got 403 errors if I don't download the m3u8/fragments without an user-agent.
If I pass the ":http-user-agent=" argument on the command line it works, but I discovered the possibility to use "#EXTVLCOPT" inside the file itself, I tried to add it but it doesn't work:

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#EXTM3U #EXTVLCOPT:http-user-agent=Mozilla/5.0 (Linux x86_64; rv:78.0) Gecko/20100101 Firefox/78.0 #EXT-X-VERSION:3 ...

With or without quotes for the string, at the end of the file, it doesn't seem to be parsed, I can see 403 errors.

Last (and biggest) issue, with the js player the m3u8 is regularly downloaded to get the latest fragments.
With VLC, only the first two fragments are played, it freezes instead of playing the third, and I don't know how to "feed" VLC with new m3u8.

[Rémi Denis-Courmont]

Are you adding the VLC option in the HLS manifest or in a separate playlist? In the earlier case, it's definitely not going to work. Apple made it so that they use the same syntax and extension for all the wrong reasons, but they're effectively different file types.

As for playlist files, note that not all options can work there for a variety of reasons.

[Dreamkey]

It's directly inside the file I download/modify before giving it to VLC, so it means inside the manifest I guess. Here is an example (please note the ts file are not kept for a long time):

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#EXTM3U #EXTVLCOPT:http-user-agent=Mozilla/5.0 (Linux x86_64; rv:78.0) Gecko/20100101 Firefox/78.0 #EXT-X-VERSION:3 #EXT-X-MEDIA-SEQUENCE:30664 #EXT-X-TARGETDURATION:10 #EXTINF:10.000, https://cdn-003.whatsupcams.com/hls/dk_hedeland01-30664.ts #EXTINF:10.000, https://cdn-003.whatsupcams.com/hls/dk_hedeland01-30665.ts #EXTINF:10.000, https://cdn-003.whatsupcams.com/hls/dk_hedeland01-30666.ts

Does the playlist allow me to add the latest fragments?
Like using:

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vlc --one-instance --playlist-enqueue new.m3u8

What happens if two file list the same ts?