lavu/opt: show default values for AV_OPT_TYPE_PIXEL_FMT and AV_OPT_TYPE_SAMPLE_FMT too

Signed-off-by: Paul B Mahol <onemda@gmail.com>

libavutil/opt.c

@@ -961,6 +961,12 @@ static void opt_list(void *obj, void *av_log_obj, const char *unit,
                 AVRational q = av_d2q(opt->default_val.dbl, INT_MAX);
                 av_log(av_log_obj, AV_LOG_INFO, "%d/%d", q.num, q.den); }
                 break;
+            case AV_OPT_TYPE_PIXEL_FMT:
+                av_log(av_log_obj, AV_LOG_INFO, "%s", av_x_if_null(av_get_pix_fmt_name(opt->default_val.i64), "none"));
+                break;
+            case AV_OPT_TYPE_SAMPLE_FMT:
+                av_log(av_log_obj, AV_LOG_INFO, "%s", av_x_if_null(av_get_sample_fmt_name(opt->default_val.i64), "none"));
+                break;
             case AV_OPT_TYPE_COLOR:
             case AV_OPT_TYPE_IMAGE_SIZE:
             case AV_OPT_TYPE_STRING: