Matrix Elements VB-800 Manual de usuario descargar pdf (Pagina 50)

Chapter 9. Stream a DVB channel (satellite or digital terrestial TV)

• cable frontend (QAM)

• dvb-frequency : speciﬁes the frequency to tune to in Hz; it is mandatory to supply the dvb-srate option to cable

frontends

• dvb-modulation : speciﬁes the modulation of the analog signal; valid values are -1 (QPSK), 0 (automatic QAM,

default), 16 (QAM16), 32 (QAM32), 64 (QAM64) 128 (QAM128), 256 (QAM256)

• terrestrial frontend (OFDM)

• dvb-frequency : speciﬁes the frequency to tune to in Hz; it is mandatory to supply the dvb-bandwidth option, all other

parameters are optional

• dvb-bandwidth : speciﬁes the bandwidth of the OFDM channel (6, 7 or 8 MHz depending on the country)

• dvb-hierarchy : speciﬁes if the OFDM channel uses hierarchic information; allowed values are -1 (no hierarchy), 0

(automatic, default), 1, 2 and 4

• dvb-code-rate-hp, dvb-code-rate-lp : speciﬁes the code-rate to use for higher and lower hierarchies respectively

(default auto, same syntax as dvb-fec)

• dvb-guard : speciﬁes the guard interval; valid values are 0 (automatic, default), 4 (1/4), 8 (1/8), 16 (1/16) and 32 (1/32)

• dvb-transmission : speciﬁes the transmission mode; valid values are 0 (automatic, default), 2 (2K) and 8 (8K)

We also ought to explain the other non-dvb-speciﬁc options of the example command-line:

• ts-es-id-pid : this option is necessary if you use the #duplicate stream output ﬁlter to split the multiplex in several

outputs; there is no need to use #duplicate neither ts-es-id-pid if you have one program only

• programs, program, sout-all : there are several ways of specifying the services to select (and optionally descramble):

• programs : used to specify one or serveral programs to select; VLC selects all known elementary streams of these

programs; this is the currently recommended way

• program : used to specify one program to select; it differs from using programs with only one program in that this

option only select the ﬁrst audio stream, and no subtitle stream; it should be used if you plan to switch programs and

audio with a GUI

• sout-all : tells VLC to select all programs; this is discouraged because of the extra CPU load needed to demultiplex

unwanted programs, and because it is not compatible with CAM descrambling

• The other options are standard stream output options and are described in the other chapters of this documentation.

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Matrix Elements VB-800 Manual de usuario Pagina 50