Download open caster 2.0 user manual - Avalpa Digital Engineering Srl

Avalpa Broadcast Server user manual
Many decoders, however, will have problems with such a simple set-up because they are
expecting a progressive video and audio time line and a correct buffer management
always progressive and forward-looking, we will address all these issues later on, for now
to keep first steps easy remind that every 8 seconds there could be some artefacts due to
the improper loop and to the modest decoder recovery skills.
VLC versions after 0.8.4 are reported to don't work any more with the tutorial files
sample.ts and firstvideo.ts because of these reasons regarding poor clock management
so even if VLC works correctly with a real set-up of OpenCaster where clock is properly
stamped it will fail to show the tutorials until clock management is put in place. (Check
Demonstration chapter for a transport stream that plays correctly on VLC for a longer time)
On the other Mplayer is able to correctly manage the clock issue:
mplayer -nocache -noidx udp://224.0.1.2:1234
Before using tsloop tool we need to introduce an important concept in OpenCaster
operations: the “fifo” (“First In First Out”)
fifo connections are the way OpenCaster tools pass TS packets to each other, the packets
are usually pulled out from the fifo but later on we will see more complex set-ups where
pull and push live together.
The following command creates a fifo:
mkfifo myfirstfifo.ts
after you can execute tsloop and the play command together:
tsloop sample.ts > myfirstfifo.ts &
tsrfsend myfirstfifo.ts -mt OFDM -mC QAM16 -mG 1/4 -mc 2/3 -mf 578
The '&' at the end of tsloop command is necessary to put the process in background .
The tsloop command will wait or the second command to "pull" the data out of the
myfirstfifo.ts.
You will be able to receive the stream with a dvb-t decoder tuning to 578 MHz, the
following pictures show the procedure step by step. Set top box manual scan menù reports
a signal is locked:
the scan finds 1 service: Avalpa 1
15
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