[Kwiver-users] [Kwiver-announce] About map-tk software

[Matthew Leotta]

Biao Yang,

Again, please send requests for support to kwiver-users at public.kitware.com <mailto:kwiver-users at public.kitware.com> or CC that list when responding directly to me.

We are working on some additional high-level documentation for MAP-Tk.  Hopefully there will be a blog post out in a month or so with a guide on how to get started with MAP-Tk.  We are also working on direct support for video files, but that will take a little longer.  Im the mean time I suggest you use FFMPEG to extract frames.  The command will be something like this:

    ffmpeg -i myvideo.avi  frame-%05d.png

Then you can get a list of those frames to pass into MAP-Tk, for example using the “ls” command like this:

    ls -1 frame-*.png > frame_list.txt

If you have high frame rate video you may want to down sample the frames if there is a lot of redundancy between frames.  You can do this either at extraction time or by specifying a subset of frames in the text file.  To extract frames with FFMPEG at 1 frame per second try:

   ffmpeg -i myvideo.avi -vf fps=1 frame-%05d.png

If you extract all the frames, but only want MAP-Tk to operate on a reduced set, you could do something like this to get a list of every 10th frame:

    ls -1 frame-*0.png > frame_list.txt

Once you have extracted frames and the image files are listed sequentially in a text file you can set "image_list_file = frame_list.txt” in your MAP-Tk configuration files.

I hope this helps.
—Matt





> On Feb 23, 2016, at 10:43 PM, yangbiaoshy <yangbiaoshy at 163.com> wrote:
> 
> Hello：
>  
>    Thank you for your reply，but I want use the command line tools to process my video data，I need to do what the video data preprocessing operation, There is no clue，If you can provide a maptk SDK development document.
>  
>  
> Thanks!
>  
> Biao Yang
>  
>  
> 2016-02-24
> yangbiaoshy
> 发件人：Matthew Leotta <matt.leotta at kitware.com>
> 发送时间：2016-01-15 22:22
> 主题：Re: [Kwiver-announce] About map-tk software
> 收件人："yangbiaoshy"<yangbiaoshy at 163.com>
> 抄送："kwiver-users"<kwiver-users at public.kitware.com>
>  
> (I have moved this discussion to the kwiver-users list.  kwiver-users is the appropriate list for support questions.  kwiver-announce is just for announcements.)
> 
> Thank you for your interest in our MAP-Tk software.  The GUI is a new addition to MAP-Tk.  In the current release, the GUI is only used to visualize the results produced by the command line tools.  The next minor release of MAP-Tk (v0.8.0 - expected in February or March) will add some processing capability to the GUI, but not yet end-to-end processing of video.  Ultimately we plan to support end-to-end processing in the GUI, but it will take some time.  MAP-Tk is still a relatively new project and is still considered “pre-release” software.
> 
> You can process video with the command line tools, but there are a few caveats to be aware of.  First, direct support of video files is under development, so for now you will need to decode your video file into a sequence of image files (e.g. PNG or JPG).  You can do this with ffmpeg or various other tools.  Second, if you are using the precompiled binary packages for MAP-Tk v0.7.1 you should be aware of a known issue of missing libraries in the package (https://github.com/Kitware/maptk/issues/125 <https://github.com/Kitware/maptk/issues/125>).  We hope to have this resolved in a week or two and then we will release new binaries with MAP-Tk v0.7.2.
> 
> I’m planning to write a blog post in the future that provides a step-by-step tutorial for running MAP-Tk, so keep a look out for that.
> 
> —Matt
> 
> 
> 
>> On Jan 15, 2016, at 3:36 AM, yangbiaoshy <yangbiaoshy at 163.com <mailto:yangbiaoshy at 163.com>> wrote:
>> 
>> hi :
>>    I download map-tk software ,  I want to process video data, but I can't import any video file  to software ,the map-tk gui only support conf\ply\krtd\txt  ,  my video file format  like  mp4\avi  and so on,  so how to import video file to map-tk software!
>>  
>> thanks
>>  
>>  
>> 2016-01-15
>> yangbiaoshy
>> _______________________________________________
>> Kwiver-announce mailing list
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