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ARRI ALEXA - Page 80

ARRI ALEXA
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80 Camera Controls
**The maximum frame rate is also limited by the write speed of the SxS PRO
card in use, which might reduce the maximum frame rate below the values
given in the table. ProRes 4444 is limited to 40 fps with SxS PRO cards up
to 32 GB capacity, and only reaches 60 fps with SxS PRO 64 GB cards .
***Apple ProResTM is a VBR (variable bit rate) codec. This means that the
actually available recording time depends on the image content. The number
given in the table is the MINIMUM available recording time for a 32 GB card.
When image content is easily compressable without loss of image quality,
the available recording time can exceed the number given in the table.
Also note that the available recording time is given for a 32 GB SxS PRO
card at 30 fps. A lower sensor fps will increase the available recording time,
while a higher sensor fps will decrease it.
²Only with High Speed license key installed on camera and active High
Speed mode. Outside of High Speed mode, the camera is limited to 60 fps.
REC OUT
Figure 60: MENU>REC OUT
The camera has two HD-SDI outputs that carry the camera image to be
recorded with external recording devices.
Note: Only use double shielded HD-SDI cables for recording to ensure error free data
transmission!
Frame rate Select the rate at which images are transmitted
per second.
HD-SDI format Select the format that is used to transmit
images. See following table for format details.
Scan format Defines how images are transmitted.
p: Progessive. Images are transmitted line
by line from left to right, starting at the top-
left pixel.
psf : Progressive segmented. Images are
first split into fields, which are then
transmitted line by line from left to right.
Note: Frame rates over 30 fps are only
available in progressive scan. This complies
with SMPTE standards.

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