Arbeiten mit ProRes / DNxHD

For internal recording, ALEXA Classic cameras have an SxS Module. They can record QuickTime/ProRes or MXF/DNxHD files to Sony SxS PRO/SxS PRO+ cards.

ALEXA Classic cameras with an XR Module upgrade or ALEXA XT cameras have the XR Module instead, which allows them to record to XR Capture Drives, Sony SxS PRO/SxS PRO+ cards and CFast 2.0 cards. 

Uncompressed ARRIRAW can only be recorded to XR Capture Drives, but ProRes and DNxHD can be recorded to all three media. SxS PRO/SxS PRO+ or CFast 2.0 cards require a mechanical adapter from ARRI. XR Capture Drives share the same mechanical interface as other Codex Capture and Transfer Drives, but only XR drives can be used for recording on ALEXA cameras.

For detailed information on data- and frame-rates within the ALEXA Classic and ALEXA XT cameras have a look at our ALEXA SUP 11 Data Rates and ALEXA SUP 11 Max Frame Rates documents.

Recording Media Overview

ProRes Recording

ALEXA is the first camera offering internal, ready-to-edit recording to QuickTime/ProRes files. With Software Update Packet (SUP) 7.0, all cameras received a free upgrade enabling ProRes 2K recording. Now SUP 11.0 adds 3.2K ProRes to the lineup of ALEXA XT cameras. Recording in ProRes 2K or 3.2K(1) is a cost-efficient alternative to shooting ARRIRAW, as it requires less storage space and no processing, but at the same time delivers an astonishing image quality – 3.2K is an ideal base for up-scaling  to UHD delivery by only a factor of 1.2.

With the option to capture ProRes 2K in the 4:3 aspect ratio(2) the format offers true anamorphic capture with regular 2.0 anamorphic lenses and offers extra room for repositioning when using standard spherical lenses. SUP 9.0 enabled ProRes 4444 recording in High Speed Mode and SUP 10 added ProRes 4444 XQ.

(1) ProRes 3.2K available on ALEXA XT only.
(2) 4:3 ProRes 2K is available on ALEXA Plus 4:3, ALEXA Studio, ALEXA M, ALEXA XT, ALEXA XT Plus, ALEXA XT Studio and ALEXA XT M.

Format Sensor Mode   Resolution   Bit Depth Data Rate
@ 24 fps
[Mbit/s](1)
Data Volume
@ 24 fps
[GB/h](1)
fps Range
(3) (4)
ProRes 422 16:9 1920 x 1080 10 bit 126 57 0.75 - 120
ProRes 422 16:9 2048 x 1152 10 bit 143 64 0.75 - 60
ProRes 422 4:3 2048 x 1536 10 bit 190 86 0.75 - 48
ProRes 422 16:9(5) 3164 x 1778 10 bit 345 155 0.75 - 30
ProRes 422 (HQ) 16:9 1920 x 1080 10 bit 188 85 0.75 - 120
ProRes 422 (HQ) 16:9 2048 x 1152 10 bit 214 97 0.75 - 60
ProRes 422 (HQ) 4:3 2048 x 1536 10 bit 286 129 0.75 - 48
ProRes 422 (HQ) 16:9(5) 3164 x 1778 10 bit 518 233 0.75 - 30
ProRes 4444(2) 16:9 1920 x 1080 12 bit 283 127 0.75 - 120
ProRes 4444(2) 16:9 2048 x 1152 12 bit 322 145 0.75 - 60
ProRes 4444(2) 4:3 2048 x 1536 12 bit 429 193 0.75 - 48
ProRes 4444(2) 16:9(5) 3164 x 1778 12 bit 777 350 0.75 - 30
ProRes 4444 XQ(2) 16:9 1920 x 1080 12 bit 423 191 0.75 - 75
ProRes 4444 XQ(2) 16:9 2048 x 1152 12 bit 482 217 0.75 - 60
ProRes 4444 XQ(2) 4:3 2048 x 1536 12 bit 643 290 0.75 - 48
ProRes 4444 XQ(2) 16:9(5) 3164 x 1778 12 bit 1165 524 0.75 - 30

Notes:
(1) ProRes is a variable bit rate codec. The actual data rate varies with the image content.
(2) ProRes 4444/4444 XQ provides an alpha channel, which is not used by the ALEXA.
(3) All speeds adjustable with 1/1000 fps precision.
(4) 4 ProRes recording speed is limited on 32GB SxS PRO cards.
(5) ProRes 3.2K is available for ALEXA XT cameras and ALEXA Classic cameras with the XR Module upgrade only. ProRes 444 XQ 3.2K is not available on SxS Pro/Pro+ cards.

 

 

DNxHD Recording

ALEXA and ALEXA XT cameras allow in-camera recording of 1920 x 1080 (16:9) DNxHD encoded MXF files onto SxS PRO cards, CFast 2.0 cards(2) or XR Capture Drives(2). With an installed DNxHD license, ALEXA users can choose between MXF/DNxHD or QuickTime/ProRes recording codecs. ALEXA's MXF/DNxHD material can be edited in Avid Media Composer Version 5.5 and later without transcoding.

The Material eXchange Format (MFX) is a core media container technology for nonlinear workflows. An MXF container file can "wrap" different types of video and audio material along with associated metadata. The internal structure of MXF files is defined by the so-called Operational Patterns. ALEXA cameras record DNxHD encoded images together with sound and embedded metadata in an MXF container file using the Operational Pattern 1a (OP1a) file structure. This is ideal for both camera acquisition and archiving since audio and video is always kept together and no data is lost if recording is interrupted for any reason. An Avid Media Composer does not need to transcode this material, as it already is available in a native DNxHD codec.

To get more information about working with ALEXA DNxHD material,
please take a look at the MXF / DNxHD White Paper.

Format Sensor Mode   Resolution   Bit Depth Data Rate
@ 24 fps
[Mbit/s]
Data Volume
@ 24 fps
[GB/h]
fps Range<(1)
DNxHD 115 16:9 1920 x 1080 8 bit 116 52 0.75 - 120
DNxHD 220x 16:9 1920 x 1080 10 bit 176 79 0.75 - 120
DNxHD 444 16:9 1920 x 1080 10 bit 352 159 0.75 - 96

(1) All speeds adjustable with 1/1000 fps precision.
(2) CFast 2.0 cards and XR Capture Drives can only be used on cameras with XR Module.