flowblade from git not finding mlt [SOLVED]

ExecutorElassus

so, because flatpak doesn't work with apulse, and flowblade is pulseaudio-only, I've installed flowblade directly from git. This is causing difficulty starting the app, because it can't find mlt, on which it depends:

grknight · Retired Dev Joined: 20 Feb 2015 Posts: 2028

ExecutorElassus · Posted: Fri Sep 29, 2023 1:38 pm Post subject:

'python3 --version' returns "Python 3.11.5", so your suspicion was correct.

I changed the top line of both setup.py and flowblade to '#!/usr/bin/python3.12'. Now, I get the following error:

Hu · Administrator Joined: 06 Mar 2007 Posts: 23128

Python packages are installed to per-versioned directories. That error says you do not have the Python package gi installed for Python 3.12. You may not have it installed at all, or you may have it installed only for versions of Python other than 3.12. Either way, the solution is to install dev-python/pygobject with at least PYTHON_TARGETS=python3_12 (and optionally other targets, at your discretion).

ExecutorElassus · Posted: Fri Sep 29, 2023 2:57 pm Post subject:

pygobject is installed, but my package.use was set only to install PYTHON_TARGETS=python3_10 python3_11, and PYTHON_SINGLE_TARGET=python3_10.

So once this 'emerge -uD world' is done, I guess I have to update that (replacing python3_10 with python3_11, and replacing python3_11 with python3_12), and then remerging world to update python support.

Or is there a faster/cleaner way to do that?

Cheers,

EE

Hu · Administrator Joined: 06 Mar 2007 Posts: 23128

That is correct. You only need to add 3.12 for pygobject + anything it depends on. You can keep 3.10 or not, as you like. You can rebuild non-relevant packages with python 3.12 now or not, also as you like.

ExecutorElassus · Posted: Fri Sep 29, 2023 6:17 pm Post subject:

OK, now I have the same problem with "PIL". I really wish there were a way to find out what python package provides a given module, because a lot of them have very minimal, generic names that you can't really search for. Is it dev-python/pillow?

UPDATE: It was pillow. I got past not finding all the needed python modules, but now startup fails with this error:

Hu · Administrator Joined: 06 Mar 2007 Posts: 23128

That looks to me like a package bug. It tried to create some object, assumed the creation would never fail, then tried to use that object. When the object creation failed, that triggered an exception on use. The package should have detected the failure and given you a clear message, like "Failed to create compositor object: check <relevant conditions>". Without looking at the failed function, I cannot comment on what it needs or what is wrong.

ExecutorElassus · Posted: Fri Sep 29, 2023 8:03 pm Post subject:

welp, time to post the issue to the github!

ExecutorElassus · Posted: Sat Sep 30, 2023 11:53 am Post subject:

Also, the dependencies for flowblade are listed here. I just emerged frei0r-plugins, which didn't help, but is there anything else you see on that list that might create the problem I'm having?

Would the failed function be found in sequence.py? At that line number, I have this code:

ExecutorElassus · Posted: Sat Sep 30, 2023 2:09 pm Post subject:

According to this issue report, there are problems with gentoo's MLT and SDL1 support, with people having similar issues with flowblade crashing right at this point in the startup.

So now I'm going to go search to see if there's some workaround (that issue posted an ebuild, but the portage tree also has libsdl as a compatibility layer for SDL1 apps).

It's really frustrating that so many linux developers are defaulting to just releasing flatpak apps, since Linux was supposed to be about NOT releasing monolithic, all-in-one app packages.

UPDATE: I found a workaround by copying the ebuild to my /usr/local overlay, adding an -r1 to the end, and editing it to build against SDL1 instead of SDL2. Now it starts, huzzah! I'll mark this as [SOLVED], but now I have the issue that flowblade is … not the most intuitive software to use. Simple stuff like adding a text overlay seems really difficult to do. Oh well, time to learn things!

Cheers,

EE

ExecutorElassus · Posted: Thu Nov 02, 2023 7:06 pm Post subject:

UPDATE: mlt has now come out with version 7.20, and now flowblade segfaults right after initializing mlt.

Can anybody help me pin down what the issue is?

UPDATE: nevermind, it turns out that the problem is with mlt-7.20, which just added some new function that doesn't work with flowblade. Guess I'll wait for updates from upstream.

Cheers,

EE