Ended up removing epiphany, it just kept crashing.
Tried thorium and it plays the H265 files at https://test-videos.co.uk/

Being lazy this morning I installed deb2tgz from SBo and used that with the deb package found at https://github.com/Alex313031/thoriu....157_amd64.deb

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Few days ago, I created a SlackBuild script to install thorium on Slackware.

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Just tried it... it works.
Tested the H265 links and no hurdles seen

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there is simple fix to your problem with firefox:
install Content Type Fixer:
https://addons.mozilla.org/en-US/fir...E2Ni4wLjAuMA..
Configure so it starts with firefox and select "force Downloading"

First time it will ask if you want to download file, select option always open with

That's all now you can open mp4 file in firefox. It will open mp4 with mpv

It was a good try. Firefox uses an internal version of ffmpeg copied into their source code. Firefox can be compiled to use many system libraries using the '--with-system-*' flag, but ffmpeg is unfortunately not one of them. '--enable-ffmpeg' is the closest you will get, but not what we need.

As I stated in the first post, I'm using Slackware64-current, daily updated.
Recompiled gstreamer, ffmpeg, installed x265-3.5-x86_64-1alien, nVidia kernel & driver all support HW decoder/encoder.

On my machine Thorium refuse to play HEVC. Not working from Zoneminder and also when dropping mp4 file to it.

All done as suggested above, but "the format is not supported" response when dropping HEVC file to it, or try to watch on Zoneminder page.

Just to confirm, when recompiling ffmpeg did you run it with `X265=yes`?

Checking the linked libraries from ffmpeg should show libx265

Thanks for the hint.
My results:


Sum of all work done until now:

ffmpeg compiled with HEVC support (above)
gstreamer compiled & installed afterwards
firefox - installed Content-type fixer plugin

falkon, firefox and thorium failed to play HEVC dropped to it and also clip from zoneminder
thorium-shell response:
Konqueror plays HEVC dropped in with internal player and all external players (VLC, xine, QtAV QML Player, QtAV Player,Dragon player, MPlayer)
Konqueror failed to play HEVC from within zoneminder.

What does that even mean? Perhaps you need to quickly describe exactly how zoneminder works in regards to how things are accessed, stored etc.. Those things aren't abstract, but concrete. Video streams go from somewhere to somewhere, video files are stored somewhere, you access it somehow.

Anyways, if you do want to run a test, you could take one of those HECV files you fetched and self host it with apache, and try to view it with the different web browsers (locally). Perhaps it is a bit too much, but it should give you a solid indication if each browser is or isn't able to play the format, without any kind of abstract things added, or any unknown factors.

Finally found a partial solution.

Gnome WEB aka Epiphany flatpak package from https://flathub.org/apps/org.gnome.Epiphany
flatpak package is from Aliens repository.
Epiphany is stable and YES, HEVC video play is fully supported from zoneminder.

Real solution would be a native Slackware web browser supporting HEVC.

So still not marked as solved.

Just tried Thorium again and it doesn't crash with https://test-videos.co.uk/
Give Thorium a shot and see if that solves your quest.

Installed version 117.0.5938.157 stable

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empty

Three posts earlier - Thorium failed (same version as yours).

Interesting. The latest epiphany versions are built against webkit2gtk6.0, while the older version on SBo is built against webkit2gtk4.1. I wonder if that makes the difference for your zoneminder videos. Notable differences are that webkit2gtk6.0 adds in libavif and libjxl as dependencies. I wonder if you're using any AV1 encoding?

FWIW I could play the sample HEVC clips in this thread with the older epiphany version using webkit2gtk4.1, but maybe there's something else with the newer version that you needed.


For the record: the epiphany version on SBo is version locked at 43.1 until next slackware release, due to the older versions of gtk4, gstreamer, and glib2 in slackware 15.0 (which are needed by epiphany, and/or its deps). Newer versions of epiphany like 45.1 can be built as a native package on slackware-current, but SBo targets 15.0 only. Once the next release comes around I'll be looking at updating it (and after webkit2gtk6.0 can be added).

For now it seems the flatpak is the best option.