Dear readers,
I’m trying to create a cross platform mobile application (iOS and Android),
that captures frames from the webcam, encodes them and streams them over UDP to
a desktop application.
I’ve tested my setup and programs and they work just fine when both of the
devices stream and receiving are on the same VLAN/subnet. So I decided I would
test the receiving end on a Windows PC which is connected by means of an
ethernet cable, that unfortunately doesn’t work. The wired PC’s are on a
different subnet then the Wi-Fi devices, but there’s sill connectivity between
them.
For example issuing a traceroute or a ping from a laptop connected to the Wi-Fi
subnet (172.16.101.0/24) to a PC in the ethernet subnet (172.16.11.0/24):
"traceroute -P ICMP -p 6005 172.16.11.102”, works just fine.
The stream is openend and used in an comparable manner to this;
"
m_filename = "udp://172.16.11.102:6005”;
m_fmt_ctx = avformat_alloc_context();
m_fmt_ctx->oformat = m_fmt;
const char* cname = m_filename.toStdString().c_str();
strcpy(m_fmt_ctx->filename, cname);
// …
if (avio_open(&m_fmt_ctx->pb, m_filename.c_str(), AVIO_FLAG_WRITE) < 0)
{
/* HANDLE THE ERROR */
}
// write some packets and when we’re done call avio_close() and wrap up.
if (av_interleaved_write_frame(m_fmt_ctx, packet) < 0)
{
/* HANDLE THE ERROR */
}
“
The strange thing is when this code is in a “cross subnet” setup such as the
example above that all the functions such as avio_open() and
av_interleaved_write_frame() return 0, However there’s nothing actually being
writing, I’ve confirmed this using Wireshark.
Does anybody have an idea about what I might be doing wrong?
Cheers,
Tim.
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