OK, I made work the mp4 container

So in all my trial , I have introduce en error in the video path /path/path/FooBar.mp4 as those test where taking place under Windows this time, the front / was making the file unreachable, "funny" in the console no error about that, but about codec that is not found..... O_o

MP4

it worked with

...
<source src="path/FooBar.mp4" type="video/mp4">
...
<!-- so without specifying the codec, at least -->

MKV

I've tried everything so far, I didn't managed to make it work :/ so it seem that finally Firefox do not support MKV with AV1

Thank you @IsoKiero@sopuli.xyz !
This is the solution.

unfortunately I can't apply it, because the NAS is a closed proprietary 💩

Worked, perfectly 👍

@MrJameGumb@lemmy.world No you were right at first ! the question is

When they cross each other, which one is the closet to the earth ?

So indeed when they cross they are the same point in space (more or less otherwise it's a collision :) ) so if they are at the same point the are at the same distance to Earth... :)

it say only 12V for the DC.

and for the PoE it said only: PoE (802.3af) and that's it :/

MP4 container part, solved --> https://lemmy.ml/post/22627660

btw:

when I open .mp4 container version of it, by file path (url bar) like file:///X:/path/FooBar.mp4 it works, so Firefox can Open it… (now still to make it work inside an html page )

for .mkv it trigger a file download…

Thanks @Malix@sopuli.xyz ,

by any change I've tried codecs="avc1.4d401f" with my videos but of course it's not working.

Whats drive me crazy, is when open trough file:/// Firefox can play it, but once inside an html page, you have to specify the right codec !? WTF

Thank you @taaz@biglemmowski.win no matter the type I enter, it's still not working...

btw the videos on your link are encoded H264 with , not AV1

Codec: H264 - MPEG-4 AVC (part 10) (avc1)

ffmpeg -i FooBar.mkv

Stream #0:0: Video: av1 (libdav1d) (Main), yuv420p(tv, bt709, progressive).....

Thanks all for your input,

I've found what works very well fsarchiver ! that can make live (or not) system backup awesome piece of software.

Thanks @Samsy@lemmy.ml !
I will still dig for the full resolution ( >= 2560x1440 )

Thanks @CondorWonder@lemmy.ca

it works ! Weirdly you just need to be patient ! even with the Same Wi-Fi network O_o

FYI great information about dual sim hardware type --> https://en.wikipedia.org/wiki/Dual_SIM#Types

Funny when I open .mp4 container version of it, by file path (url bar) like file:///X:/path/FooBar.mp4 it works, so Firefox can Open it.... (now still to make it work inside an html page 😑 )

for .mkv it trigger a file download...

Thank you BananaTrifleViolin,

I've tried all your solutions, none works.

Yes they are AV1 (I have encoded them)

Codec: AOMedia's AV1 Video (av01)
Color primaries: ITU-R BT.709
(audio): Codec: MPEG AAC Audio (mp4a)\

\

... So much for Web standards! ...

Couldn't agree more

I think you can also drag and drop video into Firefox to see if they will play.

no, this initiated a download :/