Video Quality

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Tiamat1701
Posts: 55
Joined: 24 Nov 2016, 02:06

Video Quality

Post by Tiamat1701 » 02 Dec 2016, 21:36

So I have my Presence sending recorded video to FTP at 1080p resolution. The video quality is terrible! It seems there are a lot of compression artifacts, even though the video is at 3 Mbps.

Sample video here:
https://dl.dropboxusercontent.com/u/206 ... f87fe4.mp4

You can't read the writing on the people's jacket or hat. In static, non-moving objects (wood chips on ground) there is a ton of pixelation from frame to frame, giving a "sparkling effect" Are other people getting terrible quality video?

kthemall
Posts: 66
Joined: 31 Oct 2016, 12:59

Re: Video Quality

Post by kthemall » 05 Dec 2016, 16:37

hi

i have the same, video quality is soooooo far away from that what you can see in the promo-video. this is never 1080p. i copy it to an ftp server on my internal lan, as mentioned quality is very poor although it is set to 1080p

Netatmo we need some information from you!!!!!



thx tom

Una Real
Posts: 300
Joined: 04 Dec 2012, 23:16

Re: Video Quality

Post by Una Real » 05 Dec 2016, 18:26

Tiamat1701 wrote:So I have my Presence sending recorded video to FTP at 1080p resolution. The video quality is terrible! It seems there are a lot of compression artifacts, even though the video is at 3 Mbps.

Sample video here:
https://dl.dropboxusercontent.com/u/206 ... f87fe4.mp4

You can't read the writing on the people's jacket or hat. In static, non-moving objects (wood chips on ground) there is a ton of pixelation from frame to frame, giving a "sparkling effect" Are other people getting terrible quality video?
3 Mbps is a poor data rate - even for VGA at 640x480 (which is normally around 4Mbps). Am not surprised you think it looks terrible if you're expecting HD at full resolution.

Tiamat1701
Posts: 55
Joined: 24 Nov 2016, 02:06

Re: Video Quality

Post by Tiamat1701 » 06 Dec 2016, 02:51

For comparison here is a video taken the same day with the Trendnet IP cam. The data rate averages about 4 Mbps but it is 30 fps (vs Presence which is 3 Mbps at 24 fps):

https://dl.dropboxusercontent.com/u/206 ... v00058.mp4

The mp4 recordings are a bit wonky though, so if you want to view it you might have to download VLC media player and play it locally after downloading the clip.

Una Real
Posts: 300
Joined: 04 Dec 2012, 23:16

Re: Video Quality

Post by Una Real » 06 Dec 2016, 09:10

No reflection on you, I make a practice of not downloading and opening files from unknown sources. So I won't be looking at your video. All I'm telling you is 3 or 4 Mbps is a far less than optimal bitrate for a 1920x1080 video file. I would fully expect it to look as you described.

And I do believe Presence records at 30 fps. At least that's what they claim. However, can't confirm because my unit is not set up yet.

Tiamat1701
Posts: 55
Joined: 24 Nov 2016, 02:06

Re: Video Quality

Post by Tiamat1701 » 06 Dec 2016, 12:33

I don't fault you (curses silently there goes my chance to infect everyone on the forums with the pwned lulz trojan backdoor rootkit) :lol:

FWIW I have used VLC player to look at the Presence recordings and it is 24 fps per VLC.
Last edited by Tiamat1701 on 06 Dec 2016, 12:48, edited 1 time in total.

Una Real
Posts: 300
Joined: 04 Dec 2012, 23:16

Re: Video Quality

Post by Una Real » 06 Dec 2016, 12:46

Haha...knew you had nefarious intent!

Interesting that your video is 24 fps. Of course, video quality isn't determined by resolution. In other words, just because something is described as HD 1080p doesn't mean it's going to look good. The bitrate has a lot to do with it, as does the complexity of the scene being recorded. An empty driveway and a few plain walls will look much better at the same bitrate than a detailed scene with lots of brush, trees, etc. And the amount of motion in the scene (or lack thereof) will also have a lot to do with the ultimate quality.

Are there many settings where you can control the parameters of the video that gets recorded?

Tiamat1701
Posts: 55
Joined: 24 Nov 2016, 02:06

Re: Video Quality

Post by Tiamat1701 » 06 Dec 2016, 12:51

Not for the Presence. My Trendnet camera does allow setting of bitrate, resolution, and also video quality (ie. compression). I suspect Presence has a lot of compression artifacts and has to do with the codec they are using.

Since my videos are being recorded to an FTP Server, I wish they would just allow for high quality recordings. I don't care about space when I've got 12 TB to work with.

Una Real
Posts: 300
Joined: 04 Dec 2012, 23:16

Re: Video Quality

Post by Una Real » 06 Dec 2016, 12:59

That's disappointing. I didn't mention codec, which is certainly important, because codecs are pretty much equal in yielding acceptable quality these days. Just figured they'd be using H264 as that's the most common for an mp4 container.

Let's hope Netatmo will jump in here with some additional info and suggestions.

Una Real
Posts: 300
Joined: 04 Dec 2012, 23:16

Re: Video Quality

Post by Una Real » 06 Dec 2016, 14:32

Just occurred to me that Netatmo may be taking into account where these units are sold. If so, we could be talking about two different video systems on these forums - NTSC and PAL - even though the video is HD and progressive. And so it may make sense that the framerate would be 24fps if the video format was PAL - versus the 30fps in NTSC. It's actually 25fps, but am thinking the VLC player is showing as 24fps. That's my theory anyway.

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