Post by AtlanticFilmGear on Aug 3, 2014 10:01:16 GMT -5
Allan Tépper of ProVideo talks through the ins and outs of CFast media including the new ATOMOS Ninja Star!
The first CFast devices were shown at CES in 2009, but NAB 2014 was the first time I saw professional video products using it. CFast is a derivative format of CompactFlash which offers the very high bit rates required by virtually lossless intraframe 10-bit 4:2:2 códecs like ProRes 422 and DNxHD for HD, and even for 4K. The pioneers I saw using it were Átomos and Blackmagic. A tiny CFast chip now rivals an HDCAM SR tape, and a US$50 CFast reader now rivals an HDCAM SR deck which typically costs well over US$50k. Ahead are the details.
To clarify my statement in the above paragraph: I am aware that Avid’s DNxHD offers both 8-bit and 10-bit, but I was referring to the 10-bit variety.
What’s so special about CFast recording?
CFast 1.0 products that are already available offer 80MB/s write speed and 200MB/s read speed. CFast 2.0 (required for 4K with the mentioned códecs) is currently achieving 450MB/s speeds. Initially, some readers might not be so impressed with those numbers, since traditionally these types of media cards and códecs have measured their speed it Mb/s (megabits per second) rather than MB/s per second). Actually, that even includes high-end digital videotape recording formats, including JVC’s D9 (previously called “Digital S”), Panasonic’s DVC Pro, Panasonic’s DVC Pro50, Panasonic’s DVCPro HD, Sony’s Digital Betacam, Sony’s HDCAM, and Sony’s HDCAM SR. Even the high-end tapeless formats from Panasonic (more recently, AVC-Intra 50 and AVC-Intra 100) and Sony (XDCAM HD and more recently, XAVC and XAVC S) have also been specified in megabits. Take those megabit per second numbers and divide them by eight, and you’ll discover that they are much lower when compared to the above MB (megabyte) per second numbers. Or, if you prefer to continue to work with megabit per second nomenclature, I’ll gladly translate the numbers from the first sentence of this paragraph: In Mb/s (megabit per second) terminology, CFast 1.0 products that are already available offer 640 Mb/s write speed and 1600 Mb/s read speed. CFast 2.0 (required for 4K) is currently achieving 3600 Mb/s speeds.
For pocket-sized, mass-market memory cards sold in a blister pack, we are officially no longer in Kansas!
Take a Sony HDCAM SR deck for example. The HDCAM SR format typically has a video bit rate of 440 Mbit/s, and a total data rate of approx. 600 Mbit/s. If I translate to MB, that works out to 55 MB/s and 75 MB/s respectively. HDCAM SR decks typically cost well over US$50,000.00
Some pro video devices that use CFast
Átomos Ninja Star US$299 1080p 4:2:2 10-bit recorder (I am currently testing it… Standby for the review.)
Átomos Shogun 4K 4:2:2 recorder/monitor w/ balanced audio (I plan to test the Shogun both with the Panasonic Lumix GH4 and with the Sony A7s as soon as I receive it.)
Arri Amira camera
Blackmagic URSA camera
The above list is likely to be incomplete, but those are the ones I know about so far.
How do you read a CFast card into your computer?
Fortunately, you don’t have to spend over US$50,000 to read the CFast cards into your computer. The reader connects via USB 3.0 and costs about US$50. Oh, and one comes included with the US$299 Ninja Star recorder I am currently testing.
Will post those results as they become available.
The first CFast devices were shown at CES in 2009, but NAB 2014 was the first time I saw professional video products using it. CFast is a derivative format of CompactFlash which offers the very high bit rates required by virtually lossless intraframe 10-bit 4:2:2 códecs like ProRes 422 and DNxHD for HD, and even for 4K. The pioneers I saw using it were Átomos and Blackmagic. A tiny CFast chip now rivals an HDCAM SR tape, and a US$50 CFast reader now rivals an HDCAM SR deck which typically costs well over US$50k. Ahead are the details.
To clarify my statement in the above paragraph: I am aware that Avid’s DNxHD offers both 8-bit and 10-bit, but I was referring to the 10-bit variety.
What’s so special about CFast recording?
CFast 1.0 products that are already available offer 80MB/s write speed and 200MB/s read speed. CFast 2.0 (required for 4K with the mentioned códecs) is currently achieving 450MB/s speeds. Initially, some readers might not be so impressed with those numbers, since traditionally these types of media cards and códecs have measured their speed it Mb/s (megabits per second) rather than MB/s per second). Actually, that even includes high-end digital videotape recording formats, including JVC’s D9 (previously called “Digital S”), Panasonic’s DVC Pro, Panasonic’s DVC Pro50, Panasonic’s DVCPro HD, Sony’s Digital Betacam, Sony’s HDCAM, and Sony’s HDCAM SR. Even the high-end tapeless formats from Panasonic (more recently, AVC-Intra 50 and AVC-Intra 100) and Sony (XDCAM HD and more recently, XAVC and XAVC S) have also been specified in megabits. Take those megabit per second numbers and divide them by eight, and you’ll discover that they are much lower when compared to the above MB (megabyte) per second numbers. Or, if you prefer to continue to work with megabit per second nomenclature, I’ll gladly translate the numbers from the first sentence of this paragraph: In Mb/s (megabit per second) terminology, CFast 1.0 products that are already available offer 640 Mb/s write speed and 1600 Mb/s read speed. CFast 2.0 (required for 4K) is currently achieving 3600 Mb/s speeds.
For pocket-sized, mass-market memory cards sold in a blister pack, we are officially no longer in Kansas!
Take a Sony HDCAM SR deck for example. The HDCAM SR format typically has a video bit rate of 440 Mbit/s, and a total data rate of approx. 600 Mbit/s. If I translate to MB, that works out to 55 MB/s and 75 MB/s respectively. HDCAM SR decks typically cost well over US$50,000.00
Some pro video devices that use CFast
Átomos Ninja Star US$299 1080p 4:2:2 10-bit recorder (I am currently testing it… Standby for the review.)
Átomos Shogun 4K 4:2:2 recorder/monitor w/ balanced audio (I plan to test the Shogun both with the Panasonic Lumix GH4 and with the Sony A7s as soon as I receive it.)
Arri Amira camera
Blackmagic URSA camera
The above list is likely to be incomplete, but those are the ones I know about so far.
How do you read a CFast card into your computer?
Fortunately, you don’t have to spend over US$50,000 to read the CFast cards into your computer. The reader connects via USB 3.0 and costs about US$50. Oh, and one comes included with the US$299 Ninja Star recorder I am currently testing.
Will post those results as they become available.
You're just, awesome ... ~xo 