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).

2 files changed, 2 insertions, 0 deletions

diff --git a/editor/icons/MainMovieWrite.svg b/editor/icons/MainMovieWrite.svg
new file mode 100644
index 0000000000..21464bb57c
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+++ b/editor/icons/MainMovieWrite.svg
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+<svg height="16" width="16" xmlns="http://www.w3.org/2000/svg"><path d="M8 2a6 6 0 0 0-6 6 6 6 0 0 0 6 6 6 6 0 0 0 4-1.535V14h.002a2 2 0 0 0 .266 1A2 2 0 0 0 14 16h1v-2h-.5a.5.5 0 0 1-.5-.5V8a6 6 0 0 0-6-6zm0 1a1 1 0 0 1 1 1 1 1 0 0 1-1 1 1 1 0 0 1-1-1 1 1 0 0 1 1-1zm3.441 2a1 1 0 0 1 .89.5 1 1 0 0 1-.366 1.365 1 1 0 0 1-1.367-.365 1 1 0 0 1 .367-1.365A1 1 0 0 1 11.44 5zm-6.953.002a1 1 0 0 1 .547.133A1 1 0 0 1 5.402 6.5a1 1 0 0 1-1.367.365A1 1 0 0 1 3.67 5.5a1 1 0 0 1 .818-.498zM4.512 9a1 1 0 0 1 .89.5 1 1 0 0 1-.367 1.365A1 1 0 0 1 3.67 10.5a1 1 0 0 1 .365-1.365A1 1 0 0 1 4.512 9zm6.904.002a1 1 0 0 1 .549.133 1 1 0 0 1 .365 1.365 1 1 0 0 1-1.365.365 1 1 0 0 1-.367-1.365 1 1 0 0 1 .818-.498zM8 11a1 1 0 0 1 1 1 1 1 0 0 1-1 1 1 1 0 0 1-1-1 1 1 0 0 1 1-1z" fill="#e0e0e0"/></svg>
diff --git a/editor/icons/MainMovieWriteEnabled.svg b/editor/icons/MainMovieWriteEnabled.svg
new file mode 100644
index 0000000000..b12ea38bed
--- /dev/null
+++ b/editor/icons/MainMovieWriteEnabled.svg
@@ -0,0 +1 @@
+<svg height="16" width="16" xmlns="http://www.w3.org/2000/svg"><path d="M8 2a6 6 0 0 0-6 6 6 6 0 0 0 6 6 6 6 0 0 0 4-1.535V14h.002a2 2 0 0 0 .266 1A2 2 0 0 0 14 16h1v-2h-.5a.5.5 0 0 1-.5-.5V8a6 6 0 0 0-6-6zm0 1a1 1 0 0 1 1 1 1 1 0 0 1-1 1 1 1 0 0 1-1-1 1 1 0 0 1 1-1zm3.441 2a1 1 0 0 1 .89.5 1 1 0 0 1-.366 1.365 1 1 0 0 1-1.367-.365 1 1 0 0 1 .367-1.365A1 1 0 0 1 11.44 5zm-6.953.002a1 1 0 0 1 .547.133A1 1 0 0 1 5.402 6.5a1 1 0 0 1-1.367.365A1 1 0 0 1 3.67 5.5a1 1 0 0 1 .818-.498zM4.512 9a1 1 0 0 1 .89.5 1 1 0 0 1-.367 1.365A1 1 0 0 1 3.67 10.5a1 1 0 0 1 .365-1.365A1 1 0 0 1 4.512 9zm6.904.002a1 1 0 0 1 .549.133 1 1 0 0 1 .365 1.365 1 1 0 0 1-1.365.365 1 1 0 0 1-.367-1.365 1 1 0 0 1 .818-.498zM8 11a1 1 0 0 1 1 1 1 1 0 0 1-1 1 1 1 0 0 1-1-1 1 1 0 0 1 1-1z" fill="#e0e0e0" style="fill:#ee5353;fill-opacity:1"/></svg>