1 files changed, 8 insertions, 0 deletions
diff --git a/libavutil/opt.c b/libavutil/opt.c
index 5de891bb82..007f51d089 100644
--- a/libavutil/opt.c
+++ b/libavutil/opt.c
@@ -1964,10 +1964,18 @@ static const AVClass test_class = {
     test_options
 };
 
+static void log_callback_help(void *ptr, int level, const char *fmt, va_list vl)
+{
+    vfprintf(stdout, fmt, vl);
+}
+
 int main(void)
 {
     int i;
 
+    av_log_set_level(AV_LOG_DEBUG);
+    av_log_set_callback(log_callback_help);
+
     printf("Testing default values\n");
     {
         TestContext test_ctx = { 0 };