Provided by: libsdl3-doc_3.2.20+ds-2_all 

NAME
SDL_HINT_VIDEO_OFFSCREEN_SAVE_FRAMES - A variable controlling whether the offscreen video driver saves
output frames.
SYNOPSIS
#include <SDL3/SDL_hints.h>
#define SDL_HINT_VIDEO_OFFSCREEN_SAVE_FRAMES "SDL_VIDEO_OFFSCREEN_SAVE_FRAMES"
DESCRIPTION
This only saves frames that are generated using software rendering, not accelerated OpenGL rendering.
• "0": Video frames are not saved to disk. (default)
• "1": Video frames are saved to files in the format "SDL_windowX-Y.bmp", where X is the window ID, and Y
is the frame number.
This hint can be set anytime.
AVAILABILITY
This hint is available since SDL 3.2.0.
Simple Directmedia Layer SDL 3.2.20 SDL_HINT_VIDEO_OFFSCREEN_SAVE_FRAMES(3)