Hello, Is OpenCV an option?
http://docs.opencv.org/doc/tutorials/highgui/video-write/video-write.html On Tue, May 12, 2015 at 8:21 PM, Matthew Woehlke < mw_tr...@users.sourceforge.net> wrote: > I have an application that generates a series of images (QImage) and > writes them to disk as a video. I am encoding the video using an > external FFmpeg process, which I start and communicate with via > QProcess. I feed this the images via its stdin, using QImage::save to > write them to the QProcess in BMP format (FFmpeg options '-f image2pipe > -c:v bmp -i -'). > > This works fine on Linux. On Windows, it is APPALLINGLY slow; on the > order of seconds per frame. Also, on Windows, it takes a very long time > (minutes) before even the initial output from FFmpeg appears. (I'm using > QProcess::ForwardedChannels, although switching to default and just > letting the output buffer doesn't seem to make a difference.) > > The problem *seems* to be with QProcess; running FFmpeg in a shell seems > to have reasonable performance. It's almost as if running the process > through QProcess is causing it to execute extremely slowly. > > Has anyone else encountered anything like this, or have any idea what > might be going wrong? > > (Note: This is with Qt 4. Upgrading to Qt 5 is not an option at this time.) > > -- > Matthew > > _______________________________________________ > Interest mailing list > Interest@qt-project.org > http://lists.qt-project.org/mailman/listinfo/interest > -- Pau Garcia i Quiles http://www.elpauer.org (Due to my workload, I may need 10 days to answer)
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