how much bytes is the overhead?
does the recieving ZMQ block has to get the
bytes in chunks of 188 bytes?
i recieve the udp ts stream in varies packet
sizes... and send the straight to the ZMQ
framework.
does a 188 byte packitizer exist in gnuradio,
so he can do this job?
or isn't this the reason for the sunc errors?
i somethimes get a few frames visible... so it
has to be related to timings...
Van: "Ron Economos"
<address@hidden>
Aan: "discuss-gnuradio"
<address@hidden>
Verzonden: Woensdag 26 april 2017 21:21:39
Onderwerp: Re: [Discuss-gnuradio] WARN:
transport stream sync error
You may want to put a file sink block after
your ZMQ block to make sure you're chain is
working as expected.
Usually 188 byte alignment is just done by picking
a UDP packet size that's a multiple of 188 bytes
(plus overhead). For example, VLC in UDP mode uses
1358 byte packets and puts 7 TS packets in each
UDP packet. Like so:
Ron
Are you saying that there are no sync
bytes in my stream?
or should i wait until i get byte 0x47 in
my udp packet, wait till i get 188 bytes,
and send them as an array of bytes in the
zeroMQ?
Van: "Ron Economos"
<address@hidden>
Aan: "discuss-gnuradio"
<address@hidden>
Verzonden: Woensdag 26 april 2017
20:16:10
Onderwerp: Re: [Discuss-gnuradio]
WARN: transport stream sync error
The BBheader block expects the Transport
Stream to start with a sync byte (0x47)
and that a sync byte appears every 188
bytes.
There's no sync byte synchronization in
the BBheader block, so if the stream
doesn't start with a sync byte, you'll get
continuous errors.
Ron
Hi,
My setup:
Linux gnuradio with dvb-s2 tx
sample code. adjusted to read from
ZeroMQ pull source
5M symbol. in 8psk dvb-s2 3/4 code
rate
Windows side: 2 programs:
1) program to make udpts stream
from webcam(5M) -> send udp stream
to 127.0.0.1:1234
2) program to listen to udp port
1234 get udp packets and send them to
ZeroMQ push socket
gnuradio is complaining about
transport stream sync error.
What can be the reason for this?
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