Owner`s manual

nanoFlash FAQs
10-Apr-10 ©Convergent Design, Inc. Page 18 of 42
71. What recording options and formats are supported?
Quicktime (MOV) and MXF Bit-Rates
Bit Rate
Mbps
CODEC
Audio Format
Color
Sampling
Raster
Comments
100/140/180/220
/280
I-Frame
PCM 24-Bit 48K
4:2:2
1920 x 1080 /
1280 x 720p
50/100/140/180
Long-GOP
PCM 24-Bit 48K
4:2:2
1920 x 1080 /
1280 x 720p
XDCAM 422
35
Long-GOP
PCM 24-Bit 48K
4:2:0
1920 x 1080 /
1280 x 720p
XDCAM EX
35
Long-GOP
PCM 24-Bit 48K
4:2:0
1440 x 1080 /
1280 x 720p
XDCAM HD
18
Long-GOP
PCM 24-Bit 48K
4:2:0
1920 x 1080 /
1280 x 720p
Proxy
30/40/50
I-Frame
PCM 24-Bit 48K
4:2:2
720 x 486i
SD - IMX
30/40/50
I-Frame
PCM 24-Bit 48K
4:2:2
720 x 576i
SD - IMX
MPG Bit-Rates
Bit Rate
Mbps
CODEC
Audio Format
Color
Sampling
Raster
Comments
35/25/19
Long-GOP
MPEG2-Layer 1
384 Kbps
4:2:0
1920 x 1080 /
1280 x 720p
Blu-Ray
5,6,7,8,9
Long-GOP
MPEG2-Layer 1
384 Kbps
4:2:0
720 x 486i
SD-DVD
5,6,7,8,9
Long-GOP
MPEG2-Layer 1
384 Kbps
4:2:0
720 x 576i
SD-DVD
72. Is the bit-rate constant with varying frame size and frame rate?
Yes, the bit-rate is independent of the frame size (1080 or 720) and the frame rate (24,
25, 30, etc). So the effective compression is actually lower at lower frame rates. With the
nanoFlash, if you select 100 Mbps, you always get 100 Mbps, even if you are recording
24p. For example, 1080p24 at 180 Mbps is more than twice the bit-rate of DVCProHD or
AVC-I, which scales the bit-rate to 80 Mbps when using this format.
73. Do you have a recommended bit-rate for most applications?
We believe that the 100 Mbps Long-GOP is the “sweet spot” for producing superb video
quality at reasonable data-rates. Higher bit-rates will provide a very slight improvement in
video quality, but at diminishing returns.
If one is recording images with an extreme amount of detail, lots of motion or explosions
in the frame such as in an action movie; and lots of camera movement, such as when
hand-held and running; then one may consider using 280 Mbps I-Frame. 100 Mbps Long-
GOP would probably work great, but 280 I-Frame adds “insurance” against motion
artifacts.