Opencv error on python

Question

no matter what "CV_FOURCC" I use I get this:

OpenCV Error: Unsupported format or combination of formats (Gstreamer Opencv backend doesn't support this codec acutally.) in CvVideoWriter_GStreamer::open, file /usr/src/packages/BUILD/OpenCV-2.2.0/modules/highgui/src/cap_gstreamer.cpp, line 489

writer = cv.CreateVideoWriter(
         filename=file,
         fourcc=cv.CV_FOURCC('F', 'M', 'P', '4') ,
         fps=iFps,
         frame_size=(800,600),
         is_color=1)
cv.WriteFrame(writer, cv.LoadImage(frames[i]))

Also /usr/src/packages/BUILD/OpenCV-2.2.0/modules/highgui/src/cap_gstreamer.cpp, does not exist.

Also CV_FOURCC('H','F','Y','U') makes empty file.

Input is *.png, output is *.avi

Details: Opensuse 10.4, OpenCv 2.2.0

EDIT: If I do this this it creates a working AVI file:

writer = cv.CreateVideoWriter(
         filename=file,
         fourcc=cv.CV_FOURCC('F', 'M', 'P', '4') ,
         fps=iFps,
         frame_size=(800,600),
         is_color=1)
cv.WriteFrame(writer, cv.LoadImage(frames[i]))
del writer # this makes a working AVI

looks like a setup issue. do the tests (<cmake_binary_dir>/bin[/debug|/release]/cxcoretest and cvtest) work? — mgalgs
– mgalgs, Commented Aug 2, 2011 at 22:00
@mitch_feaster I didn't compile it, I installed it with YaST2 — linuxrules94
– linuxrules94, Commented Aug 2, 2011 at 22:05
Have you tried the raw format CV_FOURCC('M', 'J', 'P', 'G') ? — karlphillip
– karlphillip, Commented Aug 3, 2011 at 1:40
possible duplicate of Unable to create a basic video file using OpenCV — karlphillip
– karlphillip, Commented Aug 3, 2011 at 16:53

linuxrules94 · Accepted Answer · 2011-08-05 03:15:14Z

1

If I do this this it creates a working AVI file:

writer = cv.CreateVideoWriter(
         filename=file,
         fourcc=cv.CV_FOURCC('F', 'M', 'P', '4') ,
         fps=iFps,
         frame_size=(800,600),
         is_color=1)
cv.WriteFrame(writer, cv.LoadImage(frames[i]))
del writer # this makes a working AVI

answered Aug 5, 2011 at 3:15

linuxrules94

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3 Comments

linuxrules94 Over a year ago

@karlphillip But if I do cvReleaseVideoWriter(writer) or cv.ReleaseVideoWriter(writer) it says "no attribute "ReleaseVideoWriter" in module.."

karlphillip Over a year ago

It's there. From your code I can't tell how you are including OpenCV but usually I do from opencv.cv import * and from opencv.highgui import *

JustInTime Over a year ago

I think you are both right, opencv.cv was a previous build of the current one, while cv is the latest. I also cant find cvReleaseVideoWriter in opencv2.3.

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