gstreamer

[Brian Holt]

I've been using Pyglet to do the same job... Here is a gist:
gist.github.com/3097115

If its useful, I could put in a PR.

Brian

On 12 July 2012 10:31, Otto Fajardo <otto.fajardob at gmail.com> wrote:

> Hi Tony,
>
> thanks very much for your reply! I solved the problem and found a couple
> of things that can be useful for other users:
>
> 1- I am using Windows XP.
>
> 2- I didn't manage to property install gstreamer. I fail to import
> critical modules. No idea why.
>
> 3- Opencv works! The interesting thing is that it needs pygtk module to be
> installed.
>
>    In the past I already tried opencv for this purpose and failed. While
> trying to install gstreamer I install pygtk, and now it works
> fine, both using scikits and opencv itself!!!
>    Windows binaries for both opencv and pygtk can be obtained from
> Christoph Gohlke webpage, so it's quite easy to install.
>    I think you could mention this in your webpage, could be useful for
> future users.
>
> 4- I found something I think is a but, and I have a suggestion:
>
>    * Bug: the method duration is not working well, it gives strange
> results to me. The problem is in video.py line 107. I replace this line by
>      return cv.GetCaptureProperty(self.capture,
> cv.CV_CAP_PROP_FRAME_COUNT)/cv.GetCaptureProperty(self.capture,
> cv.CV_CAP_PROP_FPS)
>      and now works fine.
>
>   * Suggestion: implement a method to directly obtain fps from the video.
> It's quite easy, will be 2 minutes:
>     I added two funtions in video.py, one in classs CvVideo:
>     def fps(self):
>
>     return cv.GetCaptureProperty(self.capture, cv.CV_CAP_PROP_FPS)
>
>     and another in class Video:
>
>     def fps(self):
>
>     return self.video.fps()
>
>
>
>    I think this is useful.
>
>
>
> Cheers!
>
>
>
>
> 2012/7/12 Tony Yu <tsyu80 at gmail.com>
>
>> Hi Otto,
>>
>> See response below.
>>
>>  On Wed, Jul 11, 2012 at 5:14 AM, Otto <otto.fajardob at gmail.com> wrote:
>>
>>> Hi,
>>> I would like to try the Video function in skimage.io. I installed
>>> gstreamer, toghether with gstreamer sdk providing the python bindings.
>>> So, when I say import pygst from python console, it does not complain.
>>> However, trying to use the Video function like this:
>>>
>>> myvideo = skio.Video(source=source,backend='gstreamer')
>>>
>>> gives this error message:
>>>
>>>
>> <snip>
>>
>>
>>>     raise ImportError("GStreamer Python bindings 0.10+ required")
>>> ImportError: GStreamer Python bindings 0.10+ required
>>>
>>> So: how to install properly these python bindings for gstreamer???
>>>
>>
>> What system are you running and how did you install GStreamer?
>>
>> I don't actually have GStreamer installed, so my usefulness here is
>> limited. Looking at the code though, I'm not sure it's actually failing on
>> the version check (which I think raises an Assertion error, but the caught
>> exception is an ImportError).
>>
>> Could you try running the following imports:
>>
>> import gst
>> import gobject
>> from gst.extend.discoverer import Discoverer
>>
>>
>>
>>>
>>> By the way: Is this module appropiate to open a video file, let's say
>>> an avi file, that is compressed using for example with XViD, and then
>>> retrieve single frames as numpy arrays?
>>>
>>> thanks!
>>
>>
>> If GStreamer can read it, then the video plugin should be able to as
>> well. Yes, you can access a frame with the video's `get` method (which
>> returns a numpy array).
>>
>> You can also use the video functionality by using OpenCV as a backend
>> (but that could be difficult to install, depending on your system).
>>
>> Cheers,
>> -Tony
>>
>
>
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