webm module doesn't compile for iOS arm64

[endragor]

Operating system or device, Godot version, GPU Model and driver (if graphics related):
Godot master 6086252, compiling under macOS 10.12 for iOS arm64

Issue description:

Compilation of webm module produces errors in its assembly code when compiling for iOS arm64.

Steps to reproduce:

Enable webm module and compile for iOS arm64: scons tools=no p=iphone target=release arch=arm64 .

[akien-mga]

We have now entered release freeze for Godot 3.0 and want to focus only on release critical issues for that milestone. Therefore, we're moving this issue to the 3.1 milestone, though a fix may be made available for a 3.0.x maintenance release after it has been tested in the master branch during 3.1 development. If you consider that this issue is critical enough to warrant blocking the 3.0 release until fixed, please comment so that we can assess it more in-depth.

[akien-mga]

For anyone wanting to work on this, remember to re-enable building the webm module on iphone: https://github.com/godotengine/godot/blob/master/modules/webm/config.py#L2

[reduz]

remains on hero wanted, but eventually webm will be removed from core

[wirwoluf]

hi.
on this file;
https://github.com/godotengine/godot/blob/master/modules/webm/config.py#L2
I changed the line to "return True" but I am getting this error;

**ERROR**: No loader found for resource: res://splash/assets/intro.webm.
2020-05-30 23:10:03.431351+0300 Barno-Costume[1224:260284]    At: core/io/resource_loader.cpp:285:_load() - Method failed. Returning: RES()
**ERROR**: No loader found for resource: res://splash/assets/intro.webm.
  At: core/io/resource_loader.cpp:285:_load() - Method failed. Returning: RES()
2020-05-30 23:10:03.431383+0300 Barno-Costume[1224:260284] **ERROR**: res://Video.tscn:3 - Parse Error: [ext_resource] referenced nonexistent resource at: res://splash/assets/intro.webm
2020-05-30 23:10:03.431399+0300 Barno-Costume[1224:260284]    At: scene/resources/resource_format_text.cpp:440:poll() - res://Video.tscn:3 - Parse Error: [ext_resource] referenced nonexistent resource at: res://splash/assets/intro.webm

How can I fix that.
thanks.

[Calinou]

@wirwoluf WebM videos likely won't play with good enough performance on mobile anyway, so I'd suggest using Ogg Theora instead.

[wirwoluf]

@Calinou I used ogv at firs but performance was bad. and then I switch to webm-vp9. on desktop, it's performance is better than ogv. so I wanted to see on Iphone.