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Because it's literally another magnitude of data rate. For cinema raw, the whole camera has to be designed around a high speed data path to a very fast and wide

by sho 9y ago

Because it's literally another magnitude of data rate. For cinema raw, the whole camera has to be designed around a high speed data path to a very fast and wide storage system. This is much bigger, more power hungry, more thermally demanding, and more expensive than even the high end DSLRs. The a7iii can shoot JPEG at 10fps pretty much continuously as far as I can tell. Well, that's about 80MB/s. Cinema RAW 4K @30fps varies wildly but one number I've heard is about 4.5Gbps. 550MB/s. That is a substantial increase which would require not only a redesign of the entire data path but presumably much higher grades of storage. Maybe one day but not happening anytime soon!

dharma1 9y ago
Many cameras shoot raw video - blackmagic, RED, kinefinity. And even more (Sony FS, Panasonic EVA 1) with external recorders. Almost all use SSD though for raw video - new SD cards have good enough speed but haven't been widely implemented - https://liliputing.com/2018/02/wd-demos-sd-card-880mb-s-speed-pcie-x1-interface.html https://liliputing.com/2018/02/wd-demos-sd-card-880mb-s-spee... And the data rates for raw video aren't that high btw - redcode is lossless at 3:1 and visually lossless up to 9:1. CinemaDNG is about 3:1 - 4:1 (vbr). My blackmagic pocket shoots 1080p/30fps RAW on a 90MB/s SD card and the camera is the size of smallest mirrorless. I think the real reason we haven't seen more consumer RAW video is there isn't enough demand - which is a shame. While I personally love RAW video for grading I'm looking forward to seeing how much dynamic range gets stored in 10bit HVEC footage, which I think will become very popular (because of HDR displays)
- gambiting 9y ago
  Even the article you linked says the new SD cards only do 430MB/s in testing - I'm afraid a full SSD is the only way to go for raw video.
  - dharma1 9y ago
    New UHS-ii cards do up to 300MB/s sequential write, blackmagic can record 1080p raw on them, could probably push more. For 4k Check BM Ursa Mini pro and Canon C200 - both shoot 4k raw internally to Cfast cards

by sho 9y ago

dharma1 9y ago

Many cameras shoot raw video - blackmagic, RED, kinefinity. And even more (Sony FS, Panasonic EVA 1) with external recorders. Almost all use SSD though for raw video - new SD cards have good enough speed but haven't been widely implemented - https://liliputing.com/2018/02/wd-demos-sd-card-880mb-s-speed-pcie-x1-interface.html https://liliputing.com/2018/02/wd-demos-sd-card-880mb-s-spee... And the data rates for raw video aren't that high btw - redcode is lossless at 3:1 and visually lossless up to 9:1. CinemaDNG is about 3:1 - 4:1 (vbr). My blackmagic pocket shoots 1080p/30fps RAW on a 90MB/s SD card and the camera is the size of smallest mirrorless. I think the real reason we haven't seen more consumer RAW video is there isn't enough demand - which is a shame. While I personally love RAW video for grading I'm looking forward to seeing how much dynamic range gets stored in 10bit HVEC footage, which I think will become very popular (because of HDR displays)

gambiting 9y ago
Even the article you linked says the new SD cards only do 430MB/s in testing - I'm afraid a full SSD is the only way to go for raw video.
- dharma1 9y ago
  New UHS-ii cards do up to 300MB/s sequential write, blackmagic can record 1080p raw on them, could probably push more. For 4k Check BM Ursa Mini pro and Canon C200 - both shoot 4k raw internally to Cfast cards