diff --git a/drivers/media/platform/qcom/iris/iris_vdec.c b/drivers/media/platform/qcom/iris/iris_vdec.c
index ae13c3e1b426..c9f9c16cf084 100644
--- a/drivers/media/platform/qcom/iris/iris_vdec.c
+++ b/drivers/media/platform/qcom/iris/iris_vdec.c
@@ -196,6 +196,14 @@ int iris_vdec_s_fmt(struct iris_inst *inst, struct v4l2_format *f)
 	if (vb2_is_busy(q))
 		return -EBUSY;
 
+	/* Width and height are optional, so fall back to a valid placeholder
+	 * resolution until the real one is decoded from the bitstream.
+	 */
+	if (f->fmt.pix_mp.width == 0 && f->fmt.pix_mp.height == 0) {
+		f->fmt.pix_mp.width = DEFAULT_WIDTH;
+		f->fmt.pix_mp.height = DEFAULT_HEIGHT;
+	}
+
 	iris_vdec_try_fmt(inst, f);
 
 	switch (f->type) {