diff --git a/media/ffvpx/libavcodec/vp9.c b/media/ffvpx/libavcodec/vp9.c
--- a/media/ffvpx/libavcodec/vp9.c
+++ b/media/ffvpx/libavcodec/vp9.c
@@ -235,8 +235,11 @@ static int update_size(AVCodecContext *avctx, int w, int h)
         *fmtp++ = s->pix_fmt;
         *fmtp = AV_PIX_FMT_NONE;

         ret = ff_get_format(avctx, pix_fmts);
-        if (ret < 0)
+        if (ret < 0) {
+            ff_set_dimensions(avctx, s->w, s->h);
             return ret;
+        }

         avctx->pix_fmt = ret;
         s->gf_fmt  = s->pix_fmt;