Do not initialize SDL video when not necessary

The SDL video subsystem is required for video playback and clipboard
synchronization.

If neither is used, it is not necessary to initialize it.

Refs 5e59ed3135
Refs 110b3a16f6
Refs #4418 <https://github.com/Genymobile/scrcpy/issues/4418>
Refs #4477 <https://github.com/Genymobile/scrcpy/issues/4477>

app/src/scrcpy.c

@@ -419,12 +419,16 @@ scrcpy(struct scrcpy_options *options) {
         sdl_set_hints(options->render_driver);
     }
 
-    // Initialize the video subsystem even if --no-video or --no-video-playback
-    // is passed so that clipboard synchronization still works.
-    // <https://github.com/Genymobile/scrcpy/issues/4418>
-    if (SDL_Init(SDL_INIT_VIDEO)) {
-        LOGE("Could not initialize SDL video: %s", SDL_GetError());
-        goto end;
+    if (options->video_playback ||
+            (options->control && options->clipboard_autosync)) {
+        // Initialize the video subsystem even if --no-video or
+        // --no-video-playback is passed so that clipboard synchronization
+        // still works.
+        // <https://github.com/Genymobile/scrcpy/issues/4418>
+        if (SDL_Init(SDL_INIT_VIDEO)) {
+            LOGE("Could not initialize SDL video: %s", SDL_GetError());
+            goto end;
+        }
     }
 
     if (options->audio_playback) {