Revert "obs-ffmpeg: Improve NVENC detection"

This reverts commit 94b59822.

Reverting this commit because it had some negative side effects, such as
adding 500 milliseconds to the startup time.  NVENC detection should
really be done through its proper API, and not via creating an encoder
on startup.

plugins/obs-ffmpeg/obs-ffmpeg.c

@@ -116,8 +116,6 @@ cleanup:
 	destroy_log_context(log_context);
 }
 
-static const char *nvenc_check_name = "nvenc_check";
-
 static bool nvenc_supported(void)
 {
 	AVCodec *nvenc = avcodec_find_encoder_by_name("nvenc_h264");
@@ -135,35 +133,8 @@ static bool nvenc_supported(void)
 #else
 	lib = os_dlopen("libnvidia-encode.so.1");
 #endif
-	if (!lib)
-		return false;
-
 	os_dlclose(lib);
-
-	bool success = false;
-	profile_start(nvenc_check_name);
-
-	AVCodecContext *context = avcodec_alloc_context3(nvenc);
-	if (!context)
-		goto cleanup;
-
-	context->bit_rate = 5000;
-	context->width = 640;
-	context->height = 480;
-	context->time_base = (AVRational) { 1, 25 };
-	context->pix_fmt = AV_PIX_FMT_YUV420P;
-
-	if (avcodec_open2(context, nvenc, NULL) < 0)
-		goto cleanup;
-
-	success = true;
-
-cleanup:
-	if (context)
-		avcodec_free_context(&context);
-
-	profile_end(nvenc_check_name);
-	return success;
+	return !!lib;
 }
 
 bool obs_module_load(void)