int av_log_level = AV_LOG_INFO;
-static void av_log_default_callback(void* ptr, int level, const char* fmt, va_list vl)
+void av_log_default_callback(void* ptr, int level, const char* fmt, va_list vl)
{
static int print_prefix=1;
AVClass* avc= ptr ? *(AVClass**)ptr : NULL;