AVC 760 Model 3 - Video quality

[voxmagna 0]

Hi, first post so I hope I can get some help with this. I have a UK PAL version with Firmware 2020-10-K8-04-AA-14.

 

When I bought the unit I fitted a 500Gb HDD expecting (and wanting) the shorter recording times shown in the manual version 1.4. I knew I would be disappointed with the MPEG4 and CIF recording quality, even at the BEST setting. But the manual says Model 3's output MJPEG at lower frame rates.

 

My manual says model 3's record MJPEG in best frame quality mode. I can't see the point in recording MPEG4 pictures from 540 line cameras when the compression blocking is so bad you lose recognition detail - the very point of CCTV. You only need one good frame, so what's the point of a high frame rate and picture quality with poor detail?

 

When I try to select the BEST quality FRAME mode my recorder is producing such small files I know my recordings are poor quality MPEG4. Based on recording file sizes, I estimate a 500Mb HDD at 30fps will run for 30 days.

 

Can anybody with an earlier version of Model 3 firmware confirm if they can get their HDD used up really fast when set to BEST quality FRAME mode? That's what I'm looking for - what Firmware version have you got?

 

I'm also trying to find out if I can 'image' the firmware I have in my box or if somebody has a backup file. I know the risk of tampering with firmware, but I'm not happy using the AVC 760 for the quality of pictures it produces. I can get far better quality pictures on the AV out from a cheap Digicam at 4 frames/second.

 

Replies or PM's very welcome.

 

Thanks

[junglejim42 0]

I use the same model and firmware vrsion. using a 750GB HD is get about 11 days recording using best and frame settings

[voxmagna 0]

Thanks, I'll keep exploring the setup menu.

[normicgander 0]

I hear what you're saying. DVRs in general over compress the video such that the video quality is not suitable. This is why "D1" or whatever is meaningless and has no figure of merit to obtain usable forensic images.

 

With HD so cheap it's time the OEMs reduce the compression rates. Still won't help field interlace issues associated with analog cameras which can also impact image capture.

[scorpion 0]

I have been thinking about this post for a while, but then I have been away, and I have not had a chance to pursue it more.

 

What I am wondering is if you have a 760A instead of a 760?

 

http://www.avtech.com.tw/english/cctv_spec.aspx?ID=AVC760A

 

If I understand you correctly you do not have the opportunity to record in MJPEG is this right?

[scorpion 0]

I have been thinking about this post for a while, but then I have been away, and I have not had a chance to pursue it more.

 

What I am wondering is if you have a 760A instead of a 760?

 

http://www.avtech.com.tw/english/cctv_spec.aspx?ID=AVC760A

 

If I understand you correctly you do not have the opportunity to record in MJPEG is this right?