ZeeVee ZvCli User Manual - Manual (Page 21)

Zv‐Cli v1_3 www.zeevee.com Page 21 of 32
Visual Watermark
ZvBoxes overlay a Zv logo in the lower corner of the broadcast stream. The logo has a ‘heartbeat’, slowly
appearing and disappearing. This is used to identify a ZvBox as being the source of video. This visual mark can
be disabled. However, every encoded video stream also has an embedded digital watermark containing
information about the ZvBox and system that created it that cannot be removed. This is added to help trace the
source of potentially pirated video, and does not affect visual quality in any way.
Syntax
set watermark‐visual { off | on } factory default: on
Advanced MPEG2 and Transport Commands
Commands in this section should only be used if you have a strong understanding of MPEG2 encoding
management of program streams in a cable environment.
Set Audio Delay
Syntax
set mpeg2 audio‐delay <1..10> factory default: 4
In some deployments, audio may not arrive to the ZvBox perfectly synchronized with the video. When this
happens, the picture on the HDTV will have a “lip sync” issue. This command allows for skewing of the audio to
better match the video.
Each unit above 4 is a single frame time; each unit below 4 is two frame times. The default of 4 is the proper
value to use when audio and video are synchronized at the input to ZvBox. Lower values present the audio
earlier at the HDTV.
Example:
ZvCli$ set mpeg2 audio‐delay 4
Success
Set DC coefficient precision
Syntax
set mpeg2 dc‐coefficient‐size {8‐bit | 9‐bit | 10‐bit | 11‐bit} factory default: 10‐bit
MPEG2 encoding dynamically produces a DC coefficient matrix while encoding video. The precision (number of
bits per value) used to transmit each value to the HDTV can be modified. The highest precision allowed is 11‐
bits. However, we have found that some HDTVs will not operate at that setting ‐ no picture is displayed!
The default setting of 10‐bit works with every HDTV that we have tested. Using 11‐bit will result in a *slightly*
better picture, especially in very gradual changes in shade, as well as dark scenes.
Example:
ZvCli$ set mpeg2 dc‐coefficient‐size 11‐bit
Success