Implement Running Godot as Movie Writer

* Allows running the game in "movie writer" mode.
* It ensures entirely stable framerate, so your run can be saved stable and with proper sound (which is impossible if your CPU/GPU can't sustain doing this in real-time).
* If disabling vsync, it can save movies faster than the game is run, but if you want to control the interaction it can get difficult.
* Implements a simple, default MJPEG writer.

This new features has two main use cases, which have high demand:
* Saving game videos in high quality and ensuring the frame rate is *completely* stable, always.
* Using Godot as a tool to make movies and animations (which is ideal if you want interaction, or creating them procedurally. No other software is as good for this).

**Note**: This feature **IS NOT** for capturing real-time footage. Use something like OBS, SimpleScreenRecorder or FRAPS to achieve that, as they do a much better job at intercepting the compositor than Godot can probably do using Vulkan or OpenGL natively. If your game runs near real-time when capturing, you can still use this feature but it will play no sound (sound will be saved directly).

Usage:

$ godot --write-movie movie.avi [scene_file.tscn]

Missing:

* Options for configuring video writing via GLOBAL_DEF
* UI Menu for launching with this mode from the editor.
* Add to list of command line options.
* Add a feature tag to override configurations when movie writing (fantastic for saving videos with highest quality settings).

1 files changed, 4 insertions, 0 deletions

diff --git a/editor/project_settings_editor.cpp b/editor/project_settings_editor.cpp
index 404199d2da..1524993bd0 100644
--- a/editor/project_settings_editor.cpp
+++ b/editor/project_settings_editor.cpp
@@ -35,6 +35,7 @@
 #include "editor/editor_log.h"
 #include "editor/editor_node.h"
 #include "editor/editor_scale.h"
+#include "servers/movie_writer/movie_writer.h"
 
 ProjectSettingsEditor *ProjectSettingsEditor::singleton = nullptr;
 
@@ -261,6 +262,7 @@ void ProjectSettingsEditor::_add_feature_overrides() {
 	presets.insert("standalone");
 	presets.insert("32");
 	presets.insert("64");
+	presets.insert("movie");
 
 	EditorExport *ee = EditorExport::get_singleton();
 
@@ -698,4 +700,6 @@ ProjectSettingsEditor::ProjectSettingsEditor(EditorData *p_data) {
 	import_defaults_editor->set_name(TTR("Import Defaults"));
 	tab_container->add_child(import_defaults_editor);
 	import_defaults_editor->connect("project_settings_changed", callable_mp(this, &ProjectSettingsEditor::queue_save));
+
+	MovieWriter::set_extensions_hint(); // ensure extensions are properly displayed.
 }