VideoCapture{filename}

[aronfothi]

Hi,
I've tried to run this functionality with web cam and it runs well. But I could not run it with any video file.
I tried this:

th> cap = cv.VideoCapture{filename='/home/user/MH.avi'}

th> cap:isOpened()
false

[shrubb]

@aronfothi

Hi,
That's strange. On my machine, this code succeeds. I'm sure this isn't related to the bindings. Are you sure you have OpenCV tied to the necessary codec?

[shrubb]

@aronfothi
Did you solve this issue? I've run out of ideas :(

[aronfothi]

Not yet. Could you give me a hint how i could detect the missing codec? The cap:isOpened() ->
false does not give me enough info.
(sry for late reply)

[shrubb]

@aronfothi
Try checking this:

1. When installing OpenCV, you should see a report like:

...

--   Video I/O:
--     DC1394 1.x:                  NO
--     DC1394 2.x:                  YES (ver 2.2.1)
--     FFMPEG:                      YES
--       codec:                     YES (ver 53.35.0)
--       format:                    YES (ver 53.21.1)
--       util:                      YES (ver 51.22.1)
--       swscale:                   YES (ver 2.1.0)
--       gentoo-style:              YES
--     GStreamer:                   
--       base:                      YES (ver 0.10.36)
--       app:                       YES (ver 0.10.36)
--       video:                     YES (ver 0.10.36)

Here you can see the codecs that OpenCV had been linked to.

2. Check the codec that your MH.avi is encoded with. Compare.

[aronfothi]

It was the problem. It was strange because i installed the ffmpeg just before the OpenCV but somehow it was missing. After reinstall it works well.
Thanks.