macOS Installation

[snaggas]

Hi @thiesmoeller,

I tried to follow your new macOS installation instructions, but unfortunately got stuck at ninja -C build. The pylon libraries (such as pylon/BaslerUniversalInstantCamera.h) are not being found even though they do exist in /Users/<username>/Library/Frameworks/pylon.framework/Versions/A/Headers. I noticed the similarity with the "RPATH" comment, but wasn't quite sure how to solve it. Any suggestion?

Cheers, Sam

P.S. Minor comments:

• . ./unpack_pylon7.3.1.sh -d pylon_7_3_1_0011.dmg -t /Users/<username>/Library/Frameworks could have --accept added to save reading the code.
• the .dmg obviously needs to be in the same directory for that call
• the gst-plugin-pylon directory needs to be cloned before cd gst-plugin-pylon of course. I assume no particular location...?

[thiesmoeller]

• In the readme will keep forcing to read/accept the EULA,
• dmg file search will be fixed
• good point put the clone in the readme, if you read the readme online this makes sense
• will add to the macos build to CI so we have a working reference to start from ..

[thiesmoeller]

.. you forgot to checkout the feature branch

git checkout feature/macos_port_alpha

[snaggas]

Yes, I did forget that - thanks. The ninja calls then work without issues (although I think it's necessary to prefix them all: PYLON_ROOT=/Users/<username>/Library/Frameworks ninja -C build).

However, when I call LD_LIBRARY_PATH=/Users/<username>/Library/Frameworks/pylon.framework/Versions/A/Libraries gst-launch-1.0 pylonsrc ! fakesink there are some issues with libraries and finally "WARNING: erroneous pipeline: no element "pylonsrc"".

I would note that I tried both the homebrew and official versions of gstreamer, but I couldn't get as far with the official version (perhaps because it installs to the system Library, not the user library?). The meson build step throws some warnings which might be due the homebrew version.

[thiesmoeller]

you might have to clear your gstreamer cache

$HOME/.cache/gstreamer-1.0

it might be that pylonsrc got blacklisted after some failure

you can check this with

gst-inspect-1.0 -b

[thiesmoeller]

Ninja calls only have to be prefixed, if meson have to start to do a reconfigure. As you checked out the new branch, without deleting your build folder, there was a meson cache, that doesn't match the current sources -> new pylon finder run -> PYLON_ROOT has to be set

[snaggas]

Clearing the cache unfortunately doesn't help because the gst call causes the blacklisting (i.e. LD_LIBRARY_PATH=/Users/<username>/Library/Frameworks/pylon.framework/Versions/A/Libraries gst-launch-1.0 pylonsrc ! fakesink or gst-inspect-1.0 -b). These two are blacklisted: libgstpylon.dylib and libgstvalidatessim.dylib.

Here is that part of the output: (gst-plugin-scanner:99677): GStreamer-WARNING **: 16:19:50.010: Failed to load plugin '/usr/local/Cellar/gstreamer/1.22.5/lib/gstreamer-1.0/libgstpylon.dylib': dlopen(/usr/local/Cellar/gstreamer/1.22.5/lib/gstreamer-1.0/libgstpylon.dylib, 0x0002): Library not loaded: '@rpath/pylon.framework/Versions/A/Libraries/libGCBase_gcc_v3_1_Basler_pylon.dylib'

[thiesmoeller]

you have to replace <username> in the path -> or simply put $HOME/Library/Frameworks/pylon.framework/Versions/A/Libraries

[snaggas]

I actually did use the correct replacement for <username>. Sorry for the confusion - here is the actual call and result.

[thiesmoeller]

hm... only difference I see is, that I installed gstreamer from homebrew. ( also not mentioned in readme yet )

brew install gstreamer

Just checked again, this works on my side

[thiesmoeller]

It's possible that the official gstreamer build somehow only recognises the DYLD_LIBRARY_PATH environment variable for lookup. Can you give that a try?

[snaggas]

Actually, I've also been using the brew version, so I guess it makes sense to stick with that for now since it works for you.

I read the output above a bit more carefully and it seems to be getting the wrong path from @rpath. It's looking for the pylon libraries at the gstreamer installation: /usr/local/Cellar/gstreamer/1.22.5/lib/pylon.framework/Versions/A/Libraries

The pylon libraries are here of course: $HOME/Library/Frameworks/pylon.framework/Versions/A/Libraries

I tried forcing this with LD_LIBRARY_PATH=$HOME/Library/Frameworks/pylon.framework/Versions/A/Libraries DYLD_LIBRARY_PATH=$HOME/Library/Frameworks/pylon.framework/Versions/A/Libraries gst-launch-1.0 pylonsrc ! fakesink but that was just a guess and didn't work.

I was thinking of trying something like this but perhaps that's getting carried away.

[thiesmoeller]

The CI reproduces the error you see... https://github.com/basler/gst-plugin-pylon/actions/runs/5752206328/job/15593622426#step:4:979 which is good.

[snaggas]

It's not clear to me if you had success with your most recent changes, but they didn't work for me. For your info, I did at least get gst-launch-1.0 ... to run by putting a copy of the libraries where they were being sought. Obviously that's dirty, but it at least shows that it will run once the library problem has been solved...

[thiesmoeller]

I'm currently struggling with finding a good solution that still works when the system integrity protection kicks in. It seems that libraries have very limited locations in the filesystem