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Operating the Equipment Locally — Video Menu: Video Encoder Menu
Page 4-32
Reference Guide: evolution 5000 E5780 and E5782 Encoder
ST.RE.E10135.4
Selected Item
Options
Description
An error message is shown with the correct range of bitrates if the wrong rate
is entered.
bitrate:
Set the bitrate.
In SD mode, high bitrates in low resolutions cannot always generate sufficient bits to match the requested
bitrate. However, a valid picture will still be produced.
CAUTION…
When using the Encoder with a PRO IRD M2/PSR/3/422BAS in 4:2:2 SD mode the upper
video bitrate limit of the IRD is 25 Mbit/s.
If the bitrate option is set to its maximum then bitrate Tracking is automatically
switched on. In this mode, any changes which cause the mux bitrate to
increase or decrease will cause the video rate to always fill the available mux
bitrate. Changes which cause the mux rate to change include varying audio
bitrate, RS-232 data bitrate, changing symbol-rate (on Voyager units).
bitrate tracking is switched off by manually setting the video bitrate to any
value lower than the maximum.
bitrate Tracking:
On an Encoder fitted with a Remux card, only changes to the Host bitrate will cause the video rate to track.
Increasing the final bitrate (e.g. by changing the symbol=rate) will NOT cause the video=rate of the local
service to increase. This is to allow the final rate to be increased to accommodate more Remux services.
Off <constant>
VBR mode not selected. Any unused bits are stuffed.
On <stuffing off>
This uses normal quantisation levels and any unused bits are used to carry
other data. This has no impact on the quality of the encoded pictures.
On <variable>
Quantisation level is limited with pictures which are easier to encode. This is
done in order to provide more unused bits to carry other data. This may have
an impact on the quality of certain encoded pictures.
VBR Mode (HD Only):
This option is only available
from the
Systems Menu
when the M2/ESO2/HDVBR
licence key is purchased.
The VBR Mode option is selected from the
Menu
by pressing the VBR Mode softkey. The option is used to
provide spare capacity in the video stream. Operating in a stuffing off mode or in a true variable bitrate mode,
a decision can be made as to how much impact there will be on the broadcast service. The spare capacity
these modes provide is ideal for opportunistic data insertion.
VBR Mode Option (SD
Only):
This option is only available
from the
Systems Menu
when the M2/ESO2/VBR
licence key is purchased.
It is possible to operate the Encoder in a standalone Variable bitrate (VBR)
mode. When in this mode the bitrate generated by the video encoder ranges
between a minimum (Bmin - dependent on Compression Mode) and a
maximum (Bmax - set by user, up to a limit defined by the Compression
Mode). The video encoder attempts to use a bitrate to achieve a particular
picture quality set by the user.
If this is set very high then the generated bitrate clips at the Bmax value. If it is
set very low then the bitrate clips at Bmin. Somewhere in-between the bitrate
varies, depending on the picture material being encoded. Simple pictures use a
lower bitrate than complex pictures.
When in this mode the main encoder output remains at the bitrate set within
the Mux menu and any spare unused bitrate is filled with stuffing packets.
These could optionally be removed and reinserted by some equipment
between the Encoder and Decoder.
Содержание E5780
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Страница 210: ...Glossary Page A 12 Reference Guide evolution 5000 E5780 and E5782 Encoder ST RE E10135 4 BLANK...
Страница 232: ...Technical Specification Page B 22 Reference Guide evolution 5000 E5780 and E5782 Encoder ST RE E10135 4 BLANK...
Страница 236: ...Creating and Downloading a Logo Page D 2 Reference Guide evolution 5000 E5780 and E5782 Encoder ST RE E10135 4 BLANK...
Страница 248: ...Creating and Downloading a Logo Page D 14 Reference Guide evolution 5000 E5780 and E5782 Encoder ST RE E10135 4 BLANK...
Страница 250: ...Band Plans Page E 2 Reference Guide evolution 5000 E5780 and E5782 Encoder ST RE E10135 4 BLANK...
Страница 258: ...Audio Modes Page F 2 Reference Guide evolution 5000 E5780 and E5782 Encoder ST RE E10135 4 BLANK...
Страница 266: ...Audio Modes Page F 10 Reference Guide evolution 5000 E5780 and E5782 Encoder ST RE E10135 4 BLANK...
Страница 268: ...Accuracy of Frequency Sources Page G 2 Reference Guide evolution 5000 E5780 and E5782 Encoder ST RE E10135 4 BLANK...
Страница 270: ...Use of Remux Card in ASTC Page H 2 Reference Guide evolution 5000 E5780 and E5782 Encoder ST RE E10135 4 BLANK...