Fix first frame is black

src/capture/kms.c

@@ -570,6 +570,9 @@ static int gsr_capture_kms_capture(gsr_capture *cap, AVFrame *frame, gsr_color_c
     if(!capture_is_combined_plane)
         capture_pos = (vec2i){drm_fd->x, drm_fd->y};
 
+    self->params.egl->glFlush();
+    self->params.egl->glFinish();
+
     /* Fast opengl free path */
     if(self->monitor_rotation == GSR_MONITOR_ROT_0 && video_codec_context_is_vaapi(self->video_codec_context) && self->params.egl->gpu_info.vendor == GSR_GPU_VENDOR_AMD) {
         int fds[4];

src/capture/portal.c

@@ -336,6 +336,9 @@ static int gsr_capture_portal_capture(gsr_capture *cap, AVFrame *frame, gsr_colo
     
     const vec2i target_pos = { max_int(0, frame->width / 2 - self->capture_size.x / 2), max_int(0, frame->height / 2 - self->capture_size.y / 2) };
 
+    self->params.egl->glFlush();
+    self->params.egl->glFinish();
+
     // TODO: Handle region crop
 
     /* Fast opengl free path */

src/capture/xcomposite.c

@@ -258,6 +258,9 @@ static int gsr_capture_xcomposite_capture(gsr_capture *cap, AVFrame *frame, gsr_
 
     const vec2i target_pos = { max_int(0, frame->width / 2 - self->texture_size.x / 2), max_int(0, frame->height / 2 - self->texture_size.y / 2) };
 
+    self->params.egl->glFlush();
+    self->params.egl->glFinish();
+
     /* Fast opengl free path */
     if(video_codec_context_is_vaapi(self->video_codec_context) && self->params.egl->gpu_info.vendor == GSR_GPU_VENDOR_AMD) {
         vaapi_copy_egl_image_to_video_surface(self->params.egl, self->window_texture.image, (vec2i){0, 0}, self->texture_size, target_pos, self->texture_size, self->video_codec_context, frame);

src/main.cpp

@@ -3158,7 +3158,7 @@ int main(int argc, char **argv) {
     }
 
     double fps_start_time = clock_get_monotonic_seconds();
-    double frame_timer_start = fps_start_time - target_fps; // We want to capture the first frame immediately
+    double frame_timer_start = fps_start_time;
     int fps_counter = 0;
     int damage_fps_counter = 0;
 
@@ -3446,11 +3446,11 @@ int main(int argc, char **argv) {
         }
 
         double frame_time_overflow = frame_timer_elapsed - target_fps;
-        if (frame_time_overflow >= 0.0 && damaged) {
+        if ((frame_time_overflow >= 0.0 || video_pts_counter == 0) && damaged) {
             gsr_damage_clear(&damage);
             if(capture->clear_damage)
                 capture->clear_damage(capture);
-            frame_time_overflow = std::min(frame_time_overflow, target_fps);
+            frame_time_overflow = std::min(std::max(0.0, frame_time_overflow), target_fps);
             frame_timer_start = time_now - frame_time_overflow;
 
             const double this_video_frame_time = clock_get_monotonic_seconds() - paused_time_offset;