Half Video showing on preview

[ICT]

Hi

Trying to get a 1 camera setup going on my Arch Linux / Zoneminder 1.24.2 machine. The camera is an ACTI 1321, running over POE.

It took me a while but I finally have the settings right on the camera, which gives me a picture. The only issue is that this picture is only half visible (see shot), and I am struggling to work out why. If I up the resolution to the max 1280x1024, I see a white screen in place of the video. It seems very temperamental.

if you need any logs posting or similar just ask and tell me where I can find them

any help would be appreciated to get this resolved.

cheers

edit: can't post image as I am a massive spammer. (can without the http ) img15.imageshack.us/img15/655/captureeoq.jpg

[bb99]

Did you change shmmax value? Please post link (as you did in first post) showing monitor source tab settings or just list them out here.

[ICT]

Think I have the right tab, though I don't see shmmax value. I have read about how it's different for all machines though.

Thanks

img607.imageshack.us/img607/8854/capture1oe.jpg

[ICT]

bump? not sure how busy these forums can get.

anywhoo, looking on the wiki and saw the bit about the shmmax, so decided to have a play. I have got it to work on 268435456 for both values, but it is still only showing half the video as shown in screenshot one above, and only in 400x300.

I picked this resolution totally at random when I was playing at first - I can't surely have 'got lucky' and got the only resolution that works?? It's very odd

Reading

To enable mapped memory in ZoneMinder you need add add the --enable--mmap=yes switch to your configure line.

How do I find this 'configure line'? Would this be worth a shot?

[bb99]

Had a look at your source tab, all looks good if your camera is set-up to send on 7070 with exception of no path. I'm not real familiar with Acti's but I think it might be "live.sdp". Anyway you can bring the camera up in a browser directly and right click the image, select properties and it should give you a clue as to what should be in the "Remote Host Path". As a precaution the camera firmware settings and the setting in ZM must match exactly for it to work correctly. Example: if the camera resolution setting is 640*480 then ZM's resolution must be 640*480.

[ICT]

hi bb99

I have been having a play and have discovered a few things. First off if I right click the video I don't get a menu at all. I have tried view source and take the stream from that but it doesn't work.

If I set the cam from source to 320x240, then set that at the zoneminder end, I get a perfect video, no black sections at all. From that I have diagnosed the issue can only be memory allocation.

However, if I increase the memory twice or even thricefold, I am not seeing any higher resolutions supported. It is very strange. I have set shmmax and the other to the same value as suggested in articles:

268 435 456

then

536 870 912

for both parts. But I haven't seen any differences even after reboot.

I can't find the articles right now as I am being a fool, but there were two from guys struggling to get their cam to show anything, and the memory change fixed it. When I up the resolution, with any shmmax set, I only ever get half the video.

However I did set it to 400x300 with double the memory and got 2/3 instead of 1/3. So it's obviously a memory issue.

Finding the right numbers now is going to be hard.

thanks for your help

[ICT]

bump

[nightcrawler]

I sugest that you don't use SHMAX for your temp ram. but use MMAP. thats more flexible. see this recent post: http://www.zoneminder.com/forums/viewto ... 29&t=18266

And what kind off color palette do you use? Does it work correctly when swithting to grey of YUV422 palette ?

[ICT]

I am using the full colour palette.

I am a little confused trying to switch to MMAP, there doesn't seem to be a definitive guide out there on how it is achieved.

Ideally I wish to get this camera running in 1280x1024, full colour, 8 fps. I don't really understand how others are calculating shmmax and shmall as to me it seems completely random. Any number between 1 and 2560000000 for example. How is it calculated? surely zoneminder has a formula of some sort to calculate the correct settings?

Barring shmmax and shmall like you say, how do I go about switching to mmap. It seems fairly confusing. The topic was all well and good but did not have clear intructions to me. I need to know exact file locations etc.

thanks for your input

[bb99]

Formula and examples are in the wiki: http://www.zoneminder.com/wiki/index.ph ... solutions.

[ICT]

Well I tried that formula and got 500mb as the result:

1280x1024 = 1310720
x24 = 314572180
my buffer is set to 100, so x 100 = 31457218000
+ 10% = 3460300800
/8 = 432537600

What am I doing wrong? or is that right?

[bb99]

I looked over all the posts here and shared memory is not your issue at all assuming this is RDMelons ZMLarch 1.24.2? http://www.zoneminder.com/forums/viewto ... ped+memory, http://www.zoneminder.com/forums/search ... mit=Search. I'm sorry I'm not going to be able to help much from here as I only tested ZMLarch but upgraded to 1.24.2 (only tested to begin with) via Hiredguntech's post: http://www.zoneminder.com/forums/viewto ... +for+candy and haven't upgraded or changed a thing for well over a year and half now; thing is rock solid (this is a shared memory build not mmap). Also posted these instructions to the wiki (The Easy Way) incorporating the changes mentioned in subsequent posts http://www.zoneminder.com/wiki/index.php/Fedora. One of the Arch experts hopefully will chine in on this thread to help. By the way your math and understanding of the wiki article is perfect.

[ICT]

Ok well thanks for your help I really hope someone can help as this issue is rather strange. Having set mmax to the calculated number, of course it doesn't work. Need to work out shmall now.

thanks