----VVVV enables verbose mode and prints the values of parameters used to
setup the hardware for audio and video transfers.
<<<<ffffiiiilllleeeennnnaaaammmmeeee>>>>
specifies the name of the file to store the video data. If the ----aaaa3333
option is chosen audio data will be stored in a separate audio file,
ffffiiiilllleeeennnnaaaammmmeeee....aaaaiiiiffffcccc. If the files already exist they will be truncated.
DDDDEEEESSSSCCCCRRRRIIIIPPPPTTTTIIIIOOOONNNN
The utility aaaavvvvccccaaaappppttttuuuurrrreeee uses the Digital Media libraries to record a
sequence of video images input from a Silicon Graphics video device.
Audio data can also be captured in a separate AIFC file with the ----aaaa
option. If the audio and video hardware are locked to a common external
reference signal the audio and video data are guaranteed to be
synchronized.
aaaavvvvccccaaaappppttttuuuurrrreeee is best suited to store large volumes of audio and video data
in realtime. This is possible if a striped logical volume disk array of
sufficient size and configuration is used with the XFS file system. The
logical volume, xxxxllllvvvv____mmmmggggrrrr and xxxxllllvvvv____aaaasssssssseeeemmmmbbbblllleeee, and file system, mmmmkkkkffffssss____xxxxffffssss,
administration tools to configure your disk array. Another set of
production utilities, ddddiiiisssskkkkaaaalllliiiiggggnnnn and ddddiiiisssskkkkppppeeeerrrrffff are also available and make
an otherwise daunting task much simpler to perform.
Files created with this utility will be written in the QuickTime file
format. See ////uuuussssrrrr////sssshhhhaaaarrrreeee////ssssrrrrcccc////ddddmmmmeeeeddddiiiiaaaa////mmmmoooovvvviiiieeee for details on how to create and
edit QuickTime files using the SGI movie library.
The size of a video image is determined by the combination of the capture
mode, fields or frames, colorspace, and packing. The image size and
video format are then used to compute the required data transfer rate.
The video input timing and format must be set beforehand with vvvvccccpppp. If
audio input is selected with the ----aaaa option the default audio device is
used. The audio control parameters can be adjusted with aaaappppaaaannnneeeellll.
aaaavvvvccccaaaappppttttuuuurrrreeee can be run in two ways, burst mode or stream mode. In stream
mode it is assumed that the disk array onto which the data will be
recorded has been performance tested for the specified data format. The
video data is recorded directly to a file through a small fifo in memory
as defined by the ----bbbb buffer size option. If the disk device is not setup
for real-time capture the ----bbbb option can be used to record in batch mode
fashion using as many buffers as can be stored in memory with frame
accurate control in small intervals over the desired duration of time.
The ----vvvv option specifies a text file containing V-LAN edit commands.
Robust error checking is not performed, therefore, unpredictable behavior
should be expected if invalid V-LAN commands are issued or if the
commands are issued in the wrong order. Permissions and ownership of the
command file must be properly set. If V-LAN control is chosen and the CCCCOOOO
((((CCCCooooiiiinnnncccciiiiddddeeeennnncccceeee OOOOnnnn)))) and SSSSCCCC ((((SSSSeeeetttt CCCCooooiiiinnnncccciiiiddddeeeennnncccceeee)))) commands are issued the GPI
input of the video device must be connected to the V-LAN transmitter to
accurately initiate the data transfer. This option should be used in
conjunction with the ----tttt flag. A special cable must be constructed for
the trigger input. See AAAAppppppppeeeennnnddddiiiixxxx AAAA of the DDDDIIIIVVVVOOOO XXXXIIIIOOOO BBBBooooaaaarrrrdddd OOOOwwwwnnnneeeerrrr''''ssss GGGGuuuuiiiiddddeeee
