This seems like an odd comparison.
If you're comparing bandwidth between CVI and analog directly, you're talking about the cable between the camera and the DVR. As long as you have a decent cable the bandwidth there is really not relevant to anything else.
Upload speed is presumably talking about Internet bandwidth, which is the DVR to the Internet. That would not technically be dependent on the camera to DVR technology or bitrate. A DVR could theoretically produce a stream of any practical resolution/bitrate.
Maybe a new h.264-based DVR using CVI would use less network bandwidth than an old-school analog DVR with MJPEG streaming, but that's not a comparison of analog to CVI.
I find it hard to believe that bandwidth would be lower. In our Dahua HDCVI 2.0 Test, camera bandwidth was relatively high, with a lot of the CVI cameras running over 4 Mb/s in the daytime, higher than most IP cameas in the same scene.
We don't have them listed in that chart, but a 900TVL camera in that scene usually runs well under 1 Mb/s. This is assuming average 28 quantization, VBR, no cap.
It's also impossible to make a blanket "A is lower than B" statement, since the scene, compression, brightness, sharpness, camera performance, and a lot of other variables impact it. Do you know what cameras/DVRs they were talking about, specifically?
The good news for remote viewing is that pretty much all of their CVI DVRs will send a secondary stream, up to VGA resolution. So you wouldn't necessarily be losing anything on the remote view side by switching, and you'd gain higher resolution recorded video.
Thanks for the info.
They were saying that remote viewing bandwidth for CVI would be the same as analog but the remote viewing picture quality would be much better. :)
I was wondering how that was possible...
Pro Focus LLC | 06/14/15 02:02am
Their claim could only be possible if you take into account that CVI cameras are progressive scan vs the analog SD being interlaced. However, if you had two cameras in the same scene, one CVI and one SD, both set to the same substream parameters, they should in fact have the same bitrate and image quality.
Let's return to a key assertion of the OP:
If the quality is better, then the bandwidth must be higher...
This would seem logical, but on the other hand look at any bandwidth comparison table on IPVM, you will find wildly varying bitrates for the same frames rates and resolutions, even for the same mfr.
Moreover, the subjective quality assessment does not seem to correlate to the bitrates. Meaning that the cameras with the highest bitrates don't necessarily have the highest quality.
But at the end of the day the fact is... you are NOT going to get analog sized bandwidth with IP quality. :)