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Color Recording Method
The AVCHD color sample ratio is 4:2:0, with 8 bits per sample.
This means basically the camera uses more brightness information than
color. The human eye is far more sensitive to changes in light than color.
To save file size color is encoded at a reduced level and de-coded during
replay or editing to restore the original color hue.
Data Rate
The amount of storage space required by AVCHD footage depends on
the quality setting chosen on the camcorder. Most camcorders support
several quality levels, although these quality levels have different names
and bit rates on different camcorders. When variable bit rate (VBR)
encoding is used, complex and rapidly changing video requires more
data, shortening recording time. Therefore, stated variable bit rates are
an average.
Table 3: Recording Time using MP4 Format
FHD is 1920 x 1080 25 (PAL) 30 (NTSC) frames per second
HD is 1280 x 720 25 (PAL) 30 (NTSC) frames per second
VGA is 640 x 480 25 (PAL) 30 (NTSC) frames per second
In addition the camera can shoot, in VGA mode 200 fps without audio and
100 fps in 1280 x 720 mode without audio (240 and 120 fps NTSC)
The above information regarding the two video/audio encoding codecs is
for information only and it is not essential to know at this stage but I
thought it worthwhile including it here for those with an insatiable thirst for
more in depth knowledge!
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