Opusfilter filters

[jelmervdl]

Add opusfilters as choices to the list of included filters.

• Add definitions for filters
• Add definitions for preprocessors
• Add UI for added parameter types
  • list
  • tuple
• Export to opusfilter YAML
• Import (parts of) opusfilter YAML

[jelmervdl]

One thing I noticed was that opusfilter effectively loads all its dependencies on start. For long running processes this makes sense (detect import errors early on etc.) but for this runner it is a bit annoying.

Maybe there is an easy way to hook into importlib and only load a proxy module for some modules, and only when accessing of any of its components is noticed we load the actual module.

[svirpioj]

One thing I noticed was that opusfilter effectively loads all its dependencies on start. For long running processes this makes sense (detect import errors early on etc.) but for this runner it is a bit annoying.

Is it some specific dependencies that cause trouble? I guess we could try to use dynamic import for those.

[jelmervdl]

I'm not sure which bit of it is causing it. I'm using importlib's LazyLoader at the moment, and that helps to shave it down to half but start-up time on my laptop is still 2.5 seconds.

I haven't looked at hooking up some measuring callbacks to lazyloader. I also imagine there are off-the-shelf tools out there that can help us measure and break down import times per package.

[svirpioj]

Is it some specific dependencies that cause trouble? I guess we could try to use dynamic import for those.

Well, there was quite a few, with python -X importtime and tuna those were easy to find. Now on OpusFilter's develop branch, the slow modules are imported only when needed. Reduced the startup time on my computer something like 80%.

Edit: Now it's in release 2.6.0.