Camera Video Recording
What does “data rate” means in digital camera video recording?
My canon sx100 IS digital camera has two options for video recording.
1. Normal mode
2. LP mode
LP mode enables to record twice as much video then normal mode.
I recorded on both mode and found following information when I checked the video file properties.
Normal mode: Data Rate 14884kbps
LP mode: Data Rate 7384kbps
Does lower data rate means poor quality video then higher data rate?
Data rate (also bitrate) is the rate of recording… basically, how much data is used to represent your video. So yeah, if you drop to half the amount of information, something has to suffer.
There are points beyond which you need a trained eye to tell the difference… consumer tape records at 25Mb/s, some higher end pro formats go to 50Mb/s or even 100Mb/s, but much of that would be lost on the average viewer.
However, when you have different settings on your camcoder or still camera with video features, you better believe you’ll see a difference. Sometimes the lower video modes also go to a lower resolution, other times, not so much.
Consider your Canon SX100. Your best video mode is recording at 640×480 resolution at 30 progressive frames per second, which is just a bit less information than a typical DV camcorder. You are recording in Motion JPEG format, which is essentially the same thing as the DV format, and you’re employing only slightly more than half the data rate (14.8Mb/s versus 25Mb/s).. you’re going to see more compression artifacts in your highest quality video, at least on some things, than a DV camcorder. Of course, you have an excellent lens, good sensor, etc. so on many things, you may not see a great deal of difference, versus a “real” camcorder, but the potential’s there.
So now drop to LP mode… half again the bitrate… that could look ugly.. same information, twice the compression. It depends quite a bit on what you’re filming, but at this level, most people will see a difference, it’s not an expert-level thing, it’s right in yer face.
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