ALEXA SXT recording module

Apple ProRes

a high quality codec

Apple ProRes in-camera recording

Recording clips in Apple ProRes 4444 XQ can preserve the full sensor quantization in logarithmic encoding, with the same range of colors available in ARRIAW. Images recorded in a 4:4:4 codec are almost indistinguishable from uncompressed HD or UHD material. This makes internal recording attractive even for feature film productions for the big screen.
Recording in any of the high end 4:2:2 codecs provides perfect source material for Web or TV applications.

In 2010 ALEXA was the first digital motion picture camera on the market offering in-camera recording of Apple QuickTime/ProRes files onto SxS PRO cards, providing the full range of codecs from Apple ProRes 422 Proxy to Apple ProRes 4444 and later 4444 XQ.

In addition ALEXA Mini LF introduced an new way for Apple ProRes recording in 2019: sound, images and metadata are no longer wrapped inside a QuickTime *.mov container but use the common MXF (Material eXchange Format) container.

MXF is an open standard that is widely supported and allows for more flexible access to metadata. Using the same container also allows us to record ARRIRAW and Apple ProRes to the same drive without reformatting. Apple is supporting MXF/Apple ProRes and they have published the "SMPTE RDD 44: Mapping of ProRes into MXF".

ARRI cameras that currently support QuickTime/Apple ProRes will continue to use QuickTime.


Apple ProRes is a variable bitrate codec, therefore a longer recording time than initially indicated on the camera may be possible. Apple ProRes recordings are saved in a QuickTime *.mov container.

Apple ProRes White Paper (2018)