Page 1 of 3

Help with multidecimate

Posted: Wed Jun 05, 2013 4:01 pm
by Ben
I am using a mpeg4 .avi file (of auto license plates – LPs) from a Honeywell DVR to feed into a program that recognizes a full frame with the LP in it and a blow-up of the LP in a smaller frame and gives these with a copy of the Date and Time stamp. The mpeg4 is recorded by motion sensing of the Honeywell DVR and has a one second pre and post motion sequence automatically inserted with every LP sequence. I would like to remove the pre and post recording which includes no pertinent information. I have tried motion detection software to save only the sequence with the auto and LP but I have been unable to find a program that captures all of the motion frames.

I am able to accomplish this with multidecimate with avisynth and am saving it as an mpeg4 .avi file. With the original mpeg4 file obtained from the Honeywell DVR, +/- 5% more LPs are captured than when using the multidecimate file. I assume that this is related to loss of resolution by the additional conversion to YUY2 and back to mpeg4. Does anyone have any suggest to solve this problem?

Thanks!

Ben

Re: Help with multidecimate

Posted: Fri Jun 07, 2013 7:33 am
by admin
Your description is not sufficient to enable me to help you.

I can help if you provide an unprocessed source video sample and a statement of exactly how you wish to transform it.

Re: Help with multidecimate

Posted: Fri Jun 07, 2013 9:47 am
by Ben
What information do you need?

I have attached an mpeg4 .avi clip.

I want to remove all of the blank frames before and after the frames that contain vehicular motion.

Thanks for your help!

Ben

Re: Help with multidecimate

Posted: Fri Jun 07, 2013 10:12 am
by Ben
The last post did not upload the attachment.

Here is another try.

Ben

Re: Help with multidecimate

Posted: Fri Jun 07, 2013 10:14 am
by Ben
I have tried three times to upload a file without success. Is there some secret?

Ben

Re: Help with multidecimate

Posted: Fri Jun 07, 2013 11:15 am
by admin
Use mediafire.com and post the link here.

Re: Help with multidecimate

Posted: Fri Jun 07, 2013 12:35 pm
by Ben

Re: Help with multidecimate

Posted: Fri Jun 07, 2013 4:36 pm
by admin
I can't open FFDS in VirtualDub. Please use the native stream or a common video codec such as HUFYUV. Thank you.

Re: Help with multidecimate

Posted: Fri Jun 07, 2013 8:48 pm
by Ben
The hufyuv is too large to upload. Can you use x264 lossless?

The file I uploaded was a mpeg4.

Ben

Re: Help with multidecimate

Posted: Fri Jun 07, 2013 8:51 pm
by admin
Can't you get an MPG out of that camera, instead of AVI? I can't tell you in advance if I will be able to play any AVI, unless it is Xvid, Divx, or HUFYUV. I regret that I don't have time to jump through hoops to help you, so please make it easy.