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README
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README
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OpenCaster
==Contact==
Lorenzo Pallara ([email protected])
Andrea Venturi ([email protected])
==Introduction==
This package is a collection of softwares for Linux system to play out and multiplex MPEG2 transport stream format
Use-cases:
MHP, MHEG5, HbbTv and others interactive tv standards object carousel broadcast
Playout of locally stored, offline encoded audio and video for non-live tv and radio stations
Multiplexing of input multicasted UDP transport stream to output multicasted UDP transport stream
VOD system based on mpeg2 transport stream over IP or over DVB for walled garden network like hotels with coax or ethernet.
DVB-SSU update
Data casting
Teletext generator
IP encapsualtor
PSI/SI generator
EPG generator
==Integration==
OpenCaster output has been successfully integrated with a long list of dvb products, among them there are products by Cisco/Scientific Atlanta, Ericsson/Tandberg, Dektec, Eurotek, Harmonic/Scopus, MainConcept, Mitan, Screen Service, Adtec, Wellav, Arris, Sr-Systems, Deltacast, ...
==Manual==
Avalpa Broadcast Server manual is available here: http://www.avalpa.com/the-key-values/15-free-software/33-opencaster
==Test==
OpenCaster has been tested with Rohde & Schwarz DVM100L, Rohde & Schwarz DVM 400, Dektec StreamXpert and a countless number of set top boxes, digital receivers and television sets
==Technical features==
- PSI generation (PAT, PMT, NIT, SDT, TDT, AIT, TOT, ...)
- EPG/EIT generation
- Object and data carousel generation and receivement (MHP, MHEG5, HbbTv, DVB-SSU, DSMCC, ...)
- third party software AC-3, MPEG2 audio, MPEG2 video and H264 video encoders support
- Audio Description generation support
- IP encapsulation (MPE)
- Teletext generation
- CBR transport stream muxing
- PCR stamping
- Null packet replacement
- PID filtering
- PID remapping
- Null packet insertion
- Video buffer verifier
- PCR timing verifier
- PES headers analyzer
- MPEG2 video and MPEG2/AC-3 audio ES header analyzer
- M2TS file generation from TS file
==Demo==
A demonstration transport stream is available at this address:http://www.avalpa.com/the-key-values/15-free-software/59-opencaster-demo-roll
==Handy tables==
DVB-T modulations:
Modulation Coding rate Guard interval
1/4 1/8 1/16 1/32
QPSK 1/2 4.976 5.529 5.855 6.032
2/3 6.635 7.373 7.806 8.043
3/4 7.465 8.294 8.782 9.048
5/6 8.294 9.216 9.758 10.053
7/8 8.709 9.676 10.246 10.556
16-QAM 1/2 9.953 11.059 11.709 12.064
2/3 13.271 14.745 15.612 16.086
3/4 14.929 16.588 17.564 18.096
5/6 16.588 18.431 19.516 20.107
7/8 17.418 19.353 20.491 21.112
64-QAM 1/2 14.929 16.588 17.564 18.096
2/3 19.906 22.118 23.419 24.128
3/4 22.394 24.882 26.346 27.144
5/6 24.882 27.647 29.273 30.160
7/8 26.126 29.029 30.737 31.668
channel to frequency table:
21 474
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31 554
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33 570
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62 802
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mpeg audio layer 2 suggested bit rates:
56 kbps -> 1 pes packet -> 1 ts packet
112 kbps -> 1 pes packet -> 2 ts packets
160 kbps -> 1 pes packet -> 3 ts packets
224 kbps -> 1 pes packet -> 4 ts packets
all the others fall in the middle and are not a wise choice