New SD Card Standard for possible better and cheaper video recording

[pacifact]

SD Association has announced new industry standard for SD card - UHS(Ultra High Speed)

The "I" logo indicates a maximum data transfer rate of 104MegaByte / s


Class 1 logo indicates real time HD video recording capability


The only difference between SDXC and SDHC is the capacity

The maximum capacity of SDHC card is 32GB only, SDXC will go more than that.

The new UHS-I card promises to deliver a maximum data transfer rate or 104MegaByte /s (take note, this is not megabit), approximate 670X. This is almost 4 times faster than the faster SD card you can find in the current market.

In terms of video and recording speed, UHS-I is faster than professional camcorder tapeless media such as Panasonic P2 card and Sony SxS card(800MegaBit/s) . The UHS-I card would be much cheaper.

UHS-I card might not deliver the most optimistic data transfer rate of 104MB/s, but it's believed that it could reach at least half of the claimed performance - 50MB/s. This is very interesting, this might allow future video DSLR or camcorder to record in a much higher bit rate of video.

(Sony handheld flagship video camera PMW EX1R has a maximum recording bit rate of 50Mbps, which is only about 5MB/s)

[The Miracle]

Both hardware and software need to come together to produce a seamless workflow.

Canon 5D Mark II can record at ~25Mbps, so it'll only need a card fast enough to write ~2.5MB/s.

Wonder if there's a chart with all these cameras / bit rates/ and how they do actually make a difference in the quality of video

[pacifact]

Both hardware and software need to come together to produce a seamless workflow.

Canon 5D Mark II can record at ~25Mbps, so it'll only need a card fast enough to write ~2.5MB/s.

Wonder if there's a chart with all these cameras / bit rates/ and how they do actually make a difference in the quality of video

I can't find a comprehensive chart for now, but there is a video by Convergent Design for their Nano Flash unit showing high bit rate and low bit rate quality difference. Nanoflash converts raw HDMI signal and compresses it onto CF card with very high bit rate like 200Mbps in Mpeg2

http://www.convergent-design.com/Pro...6/Default.aspx

5D MK II uses AVCHD H264 codec, with same kind of quality, the bit rate is only half of MPEG2, that's to say, it records roughly same video quality as SONY PMW EX1R(50Mbps)

[Willopher]

I wonder if a chart with all the cameras / bit / and what will really make a difference in video quality..

[pacifact]

I wonder if a chart with all the cameras / bit / and what will really make a difference in video quality..

Higher bit rate video file contains more info for post production, it might look the same to our eyes, unless you play it on a 42 inches LCD, viewing frame by frame.

It's a bit hard to compare image quality in that way, cameras might not be using the same codec, eg, AVCHD vs. MPEG3 Long GOP. Further more, camcorder sensor size,number of sensors(3CMOS vs 1 CCD) lens used will contribute to the final out come.

A suggested scientific way of testing the image quality vs bit rate is to use a third party hardware encoder to encode the raw signal (from HD SDI port) into different bit rate of video clip from one particular camera. Thus comparison could be found on ConvergenceDesign website for their Nanoflash(external hardware video encoder) product