diff --git a/media/ffvpx/libavutil/tx.c b/media/ffvpx/libavutil/tx.c
--- a/media/ffvpx/libavutil/tx.c
+++ b/media/ffvpx/libavutil/tx.c
@@ -603,17 +603,17 @@ static void print_cd_info(const FFTXCode
     print_type(&bp, cd->type);
 
     av_bprintf(&bp, ", len: ");
     if (!len) {
         if (cd->min_len != cd->max_len)
             av_bprintf(&bp, "[%i, ", cd->min_len);
 
         if (cd->max_len == TX_LEN_UNLIMITED)
-            av_bprintf(&bp, "∞");
+            av_bprintf(&bp, "unlimited");
         else
             av_bprintf(&bp, "%i", cd->max_len);
     } else {
         av_bprintf(&bp, "%i", len);
     }
 
     if (cd->factors[1]) {
         av_bprintf(&bp, "%s, factors", !len && cd->min_len != cd->max_len ? "]" : "");