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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