av_log(fc, AV_LOG_TRACE, "Specific MPEG-4 header len=%d\n", len);
if (!len || (uint64_t)len > (1<<30))
return AVERROR_INVALIDDATA;
av_log(fc, AV_LOG_TRACE, "Specific MPEG-4 header len=%d\n", len);
if (!len || (uint64_t)len > (1<<30))
return AVERROR_INVALIDDATA;