diff --git a/src/screencast/pipewire_screencast.c b/src/screencast/pipewire_screencast.c
index 561f09d..cef3b92 100644
--- a/src/screencast/pipewire_screencast.c
+++ b/src/screencast/pipewire_screencast.c
@@ -35,6 +35,44 @@ static struct spa_pod *build_buffer(struct spa_pod_builder *b, uint32_t blocks,
 	return spa_pod_builder_pop(b, &f[0]);
 }
 
+static struct spa_pod *fixate_format(struct spa_pod_builder *b, enum spa_video_format format,
+		uint32_t width, uint32_t height, uint32_t framerate, uint64_t *modifier)
+{
+	struct spa_pod_frame f[1];
+
+	enum spa_video_format format_without_alpha = xdpw_format_pw_strip_alpha(format);
+
+	spa_pod_builder_push_object(b, &f[0], SPA_TYPE_OBJECT_Format, SPA_PARAM_EnumFormat);
+	spa_pod_builder_add(b, SPA_FORMAT_mediaType, SPA_POD_Id(SPA_MEDIA_TYPE_video), 0);
+	spa_pod_builder_add(b, SPA_FORMAT_mediaSubtype, SPA_POD_Id(SPA_MEDIA_SUBTYPE_raw), 0);
+	/* format */
+	if (modifier || format_without_alpha == SPA_VIDEO_FORMAT_UNKNOWN) {
+		spa_pod_builder_add(b, SPA_FORMAT_VIDEO_format, SPA_POD_Id(format), 0);
+	} else {
+		spa_pod_builder_add(b, SPA_FORMAT_VIDEO_format,
+				SPA_POD_CHOICE_ENUM_Id(3, format, format, format_without_alpha), 0);
+	}
+	/* modifiers */
+	if (modifier) {
+		// implicit modifier
+		spa_pod_builder_prop(b, SPA_FORMAT_VIDEO_modifier, SPA_POD_PROP_FLAG_MANDATORY);
+		spa_pod_builder_long(b, *modifier);
+	}
+	spa_pod_builder_add(b, SPA_FORMAT_VIDEO_size,
+		SPA_POD_Rectangle(&SPA_RECTANGLE(width, height)),
+		0);
+	// variable framerate
+	spa_pod_builder_add(b, SPA_FORMAT_VIDEO_framerate,
+		SPA_POD_Fraction(&SPA_FRACTION(0, 1)), 0);
+	spa_pod_builder_add(b, SPA_FORMAT_VIDEO_maxFramerate,
+		SPA_POD_CHOICE_RANGE_Fraction(
+			&SPA_FRACTION(framerate, 1),
+			&SPA_FRACTION(1, 1),
+			&SPA_FRACTION(framerate, 1)),
+		0);
+	return spa_pod_builder_pop(b, &f[0]);
+}
+
 static struct spa_pod *build_format(struct spa_pod_builder *b, enum spa_video_format format,
 		uint32_t width, uint32_t height, uint32_t framerate,
 		uint64_t *modifiers, int modifier_count) {
@@ -146,7 +184,7 @@ static void pwr_handle_stream_param_changed(void *data, uint32_t id,
 	uint8_t params_buffer[1024];
 	struct spa_pod_builder b =
 		SPA_POD_BUILDER_INIT(params_buffer, sizeof(params_buffer));
-	const struct spa_pod *params[2];
+	const struct spa_pod *params[3];
 	uint32_t blocks;
 	uint32_t data_type;
 
@@ -163,8 +201,56 @@ static void pwr_handle_stream_param_changed(void *data, uint32_t id,
 		data_type = 1<<SPA_DATA_DmaBuf;
 		assert(cast->pwr_format.format == xdpw_format_pw_from_drm_fourcc(cast->screencopy_frame_info[DMABUF].format));
 		if ((prop_modifier->flags & SPA_POD_PROP_FLAG_DONT_FIXATE) > 0) {
-			// TODO: fixate
+			const struct spa_pod *pod_modifier = &prop_modifier->value;
+
+			uint32_t n_modifiers = SPA_POD_CHOICE_N_VALUES(pod_modifier) - 1;
+			uint64_t *modifiers = SPA_POD_CHOICE_VALUES(pod_modifier);
+			modifiers++;
+			uint32_t flags = GBM_BO_USE_RENDERING;
+			uint64_t modifier;
+
+			struct gbm_bo *bo = gbm_bo_create_with_modifiers2(cast->ctx->gbm,
+				cast->screencopy_frame_info[cast->buffer_type].width, cast->screencopy_frame_info[cast->buffer_type].height,
+				cast->screencopy_frame_info[cast->buffer_type].format, modifiers, n_modifiers, flags);
+			if (bo) {
+				modifier = gbm_bo_get_modifier(bo);
+				gbm_bo_destroy(bo);
+				goto fixate_format;
+			}
+
+			logprint(INFO, "pipewire: unable to allocate a dmabuf with modifiers. Falling back to the old api");
+			for (uint32_t i = 0; i < n_modifiers; i++) {
+				switch (modifiers[i]) {
+				case DRM_FORMAT_MOD_INVALID:
+					modifiers = NULL;
+					n_modifiers = 0;
+					flags = GBM_BO_USE_RENDERING;
+					break;
+				default:
+					continue;
+				}
+				bo = gbm_bo_create_with_modifiers2(cast->ctx->gbm,
+					cast->screencopy_frame_info[cast->buffer_type].width, cast->screencopy_frame_info[cast->buffer_type].height,
+					cast->screencopy_frame_info[cast->buffer_type].format, modifiers, n_modifiers, flags);
+				if (bo) {
+					modifier = gbm_bo_get_modifier(bo);
+					gbm_bo_destroy(bo);
+					goto fixate_format;
+				}
+			}
+
+			logprint(ERROR, "pipewire: unable to allocate a dmabuf");
 			abort();
+
+fixate_format:
+			params[0] = fixate_format(&b, xdpw_format_pw_from_drm_fourcc(cast->screencopy_frame_info[cast->buffer_type].format),
+					cast->screencopy_frame_info[cast->buffer_type].width, cast->screencopy_frame_info[cast->buffer_type].height, cast->framerate, &modifier);
+
+			uint32_t n_params = build_formats(&b, cast, &params[1]);
+			n_params++;
+
+			pw_stream_update_params(stream, params, n_params);
+			return;
 		}
 
 		if (cast->pwr_format.modifier == DRM_FORMAT_MOD_INVALID) {