Grass Valley M-Series iVDR User Manual v.2.0.10 - Manual (Page 306)

306 M-Series User Manual 20 April 2005
Appendix A Specifications
Operational specifications
Topics include:
• “Video codec description” on page 306
• “Vertical blanking interval compression” on page 306
• “Media file system performance” on page 307
• “Video network performance” on page 307
• “AVI file encoding requirements for importing” on page 307
• “Composite analog video input performance” on page 307
Video codec description
Vertical blanking interval compression
DV25 compression mode on the iVDR supports EIA/CEA-608-B Line 21 data
services (closed captioning). This also includes the XDS portions of EIA-608
(eXtended Data Services) which is used for program ratings, time of day, etc. In
DV25 mode, the M-Series decodes and records all line 21 data from both video fields,
inserts it in the DV data stream, and then on playout, regenerates the signals on line
21.
M-Series MPEG I-Frame Only compression has the same capabilities when you
select the
VBI plus picture option in the Configuration dialog box. ( See “Selecting
video compression” on page 105 .) When VBI plus picture is selected, 32 additional
lines of the vertical blanking area are compressed along with the picture. This will
includes the closed captioning information transmitted in the vertical blanking
interval.
DV50 compression mode compresses additional VBI lines adjacent to the active
picture— 7.5 lines in 525 / 9 lines in 625. This includes the closed captioning (Line
21 data services and XDS) information transmitted in the vertical blanking interval.
Model Compression Types Description
M-122A DV25 SMPTE 314M-1999
M-222A DV25
MPEG2 I frame only SMPTE 314M-1999
4:2:2, data rate up to 25Mbs; Selectable encode range includes
active picture or active picture plus VBI.
M-222D DV25
MPEG2 I frame only SMPTE 314M-1999
4:2:2, data rate up to 25Mbs; Selectable encode range includes
active picture or active picture plus VBI.
M-322D DV25
DV50
MPEG2 I frame only
MPEG D10 (Play only)
SMPTE 314M-1999
SMPTE 314M-1999
4:2:2, data rate up to 50Mbs. Selectable encode range includes
active picture or active picture plus VBI.
4:2:2; 30, 40, 50 Mb/s; Media is input via network stream or
imported from file.