File Format Comparison

Comparison of existing DVB file formats.

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"Nokia" format.

Example:

:SAT "Astra" 19.2 E
:NET "Canal Sat
:TRP 1074 1189500 275000 1 V 0 3/4
:CHN "Canal Sat
:CHN "Hit List" 29461 R

• Can only represent DVBS.
• From libdvb - cannot find other examples.
• Can be edited in a text editor.
• Easy to parse.
• Appears to be the format used by an unknown nokia receiver (?)
• May not be the same across all nokia devices.

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meztler bros' libdvb XML

Example:

<?xml version="1.0"?>
<satellite>
<transponder type="S" freq="11817000" srate="27500000" polarity="V" >
<service id="8001" ca="1">
<description tag="0x48" type="1" provider_name="CANALSATELLITE" service_name="S$
<ca_descriptor tag="0x09" system_id="0x0500" ca_pid="2" />
<ca_descriptor tag="0x09" system_id="0x0500" ca_pid="5" />
<stream type="198" pid="1251">
</stream>
</satellite>

• Can represent all FE types.
• Extensible
• Can be edited in a text editor, but XML reduces clarity.
• Easy to parse, but requires XML parser.

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meztler bros' libdvb plaintext

Example:

LNB ID 2 TYPE 0  LOF1 9750000 LOF2 10600000 SLOF 11700000 DISEQCNR 2
  SAT ID 3592 NAME "Thor 2,3          " LNBID 2 FMIN 10700000 FMAX 12700000
    TRANSPONDER ID 0001 SATID 3592 TYPE 0 FREQ 11229000 POL H SRATE 24500000 FEC 7/8
      CHANNEL ID 0 SATID 3592 TPID 1 SID ca TYPE 0 VPID 2bc APID 2bd ANAME "eng" TTPID c9 PCRPID 2bc
      CHANNEL ID 1 SATID 3592 TPID 1 SID cb TYPE 0 VPID 200 APID 280 TTPID 240
      CHANNEL ID 2 SATID 3592 TPID 1 SID cd TYPE 0 VPID 258 APID 259 TTPID cb
      CHANNEL ID 3 SATID 3592 TPID 1 SID 196 TYPE 0 VPID 384 APID 385 TTPID 12d

• Can represent all FE types.
• Exact meaning of some values unclear.
• Extensible.
• Easy to edit in a text editor.
• Easy to parse.

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satcodx

Example:

SATCODX103PANAMSAT 9        TDIC10037200001USA Amer3020PAN009CA______195103000000000000000030000100001ESP__________ica Latina  
SATCODX103PANAMSAT 9        TDIC10037200001Cino Lat3020PAN009CA______195103000000000000000040000100001ESP__________ino         
SATCODX103PANAMSAT 9        TDIC10037200001Exa TV  3020PAN009CA______195103000000000000000050000100001ESP__________            
SATCODX103PANAMSAT 9        TDIC10037200001Hallmark3020PAN009CA______195103000000000000000060000100001ESP__________ Channel Mex
SATCODX103PANAMSAT 9        TDIC10037200001MVS Empr3020PAN009CA______195103000000000000000070000100001ESP__________esarial     

• Likely can only be able to represent DVBS.
• Not easily editable.. or understood :)
• Easy to parse.
• Not extensible.

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zap

BBC Radio 1:658166670:INVERSION_OFF:BANDWIDTH_8_MHZ:FEC_2_3:FEC_1_2:QAM_64:TRANSMISSION_MODE_2K:GUARD_INTERVAL_1_32:HIERARCHY_NONE:0:6210:14336
BBC Radio 2:658166670:INVERSION_OFF:BANDWIDTH_8_MHZ:FEC_2_3:FEC_1_2:QAM_64:TRANSMISSION_MODE_2K:GUARD_INTERVAL_1_32:HIERARCHY_NONE:0:6226:14400
BBC Radio 3:658166670:INVERSION_OFF:BANDWIDTH_8_MHZ:FEC_2_3:FEC_1_2:QAM_64:TRANSMISSION_MODE_2K:GUARD_INTERVAL_1_32:HIERARCHY_NONE:0:6242:14464
BBC Radio 4:658166670:INVERSION_OFF:BANDWIDTH_8_MHZ:FEC_2_3:FEC_1_2:QAM_64:TRANSMISSION_MODE_2K:GUARD_INTERVAL_1_32:HIERARCHY_NONE:0:6258:14528

• Can represent all FE types - but exact FE type is not encoded in the file.
• Easily editable and understood.
• Easy to parse.
• Not easily extensible - you can keep adding on more stuff at the end, but this reduces clarity a great deal.

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