MPEG (-4, h264) and FPS (MJPEG)

[al4711]

Hi,

some of the IP-Cameras vendor writes down that there cameras are able to deliver <25 FPS for MPEG4.

Does anybody can understand what they can mean with this?

Afaik MPEG have GOPs and in this GOPs you have frames but I don't think this are the 'Frames' which they mean :confused:?

Could they mean the 'showed' 'Frames' if yes how can you 'translate/transfer' it into MBits/sec :confused:?!

###Axis 211M
http://www.axis.com/products/cam_211m/index.htm
Frame rate:

Motion JPEG: Up to 12 fps at 1280x1024
20 fps at 1024x768 (partial scan)
30 fps at 800x600 (partial scan)
MPEG-4: Up to 8 fps at 1280x1024
13 fps at 1024x768 (partial scan)
20 fps at 800x600 (partial scan)
###

###Panasonic
http://panasonic.co.jp/pcc/products/en/netwkcam/lineup/bb-hcm581-580/spec.html
Frame rate*2 Max. 30 frames/sec. (640 x 480*3, 320 x 240, 192 x144)
###

###sony
http://bssc.sel.sony.com/BroadcastandBusiness/DisplayModel?m=0&p=3&sp=147&id=90837
SNCRX530N/W
MPEG4: VGA: max.30fps(NTSC), 25fps(PAL)
###

Thanks for help ;-)

Cheers

Aleks

[Dmitry Vergheles]

Hello al4711,

The frame parameter you mention, is frames per seconds that camera delivers as output. On the receiver, PC for example you can see even less if PC can't decode this frame rate in real-time.

From all the parameters you listed you can't count the rate, since no info about bitrate specified.

Only with MJPEG we can assume that it is 25 Mbit per sec.