static void print_primaries(WriterContext *w, enum AVColorPrimaries color_primaries)
{
    const char *val = av_color_primaries_name(color_primaries);
    if (!val || color_primaries == AVCOL_PRI_UNSPECIFIED) {
        print_str_opt("color_primaries", "unknown");
    } else {
        print_str("color_primaries", val);
    }
}
A NULL pointer dereference occurs when the application dereferences a pointer that it expects to be valid, but is NULL, typically causing a crash or exit.