obs-ffmpeg: Set 1000 nits for HLG metadata

plugins/obs-ffmpeg/obs-ffmpeg-mux.c

@@ -163,10 +163,9 @@ static void add_video_encoder_params(struct ffmpeg_muxer *stream,
 						: AVCOL_RANGE_MPEG;
 
 	const int max_luminance =
-		((trc == AVCOL_TRC_SMPTE2084) ||
-		 (trc == AVCOL_TRC_ARIB_STD_B67))
+		(trc == AVCOL_TRC_SMPTE2084)
 			? (int)obs_get_video_hdr_nominal_peak_level()
-			: 0;
+			: ((trc == AVCOL_TRC_ARIB_STD_B67) ? 1000 : 0);
 
 	dstr_catf(cmd, "%s %d %d %d %d %d %d %d %d %d %d ",
 		  obs_encoder_get_codec(vencoder), bitrate,

plugins/obs-ffmpeg/obs-ffmpeg-output.c

@@ -223,10 +223,13 @@ static bool create_video_stream(struct ffmpeg_data *data)
 			data->config.video_encoder))
 		return false;
 
-	if ((data->config.color_trc == AVCOL_TRC_SMPTE2084) ||
-	    (data->config.color_trc == AVCOL_TRC_ARIB_STD_B67)) {
+	const enum AVColorTransferCharacteristic trc = data->config.color_trc;
+	const bool pq = trc == AVCOL_TRC_SMPTE2084;
+	const bool hlg = trc == AVCOL_TRC_ARIB_STD_B67;
+	if (pq || hlg) {
 		const int hdr_nominal_peak_level =
-			(int)obs_get_video_hdr_nominal_peak_level();
+			pq ? (int)obs_get_video_hdr_nominal_peak_level()
+			   : (hlg ? 1000 : 0);
 
 		size_t content_size;
 		AVContentLightMetadata *const content =