output.avi from example corrupted + codec for recording cannot be specified in OpenCVFrameRecorder

[GoogleCodeExporter]

output.avi from example corrupted + codec for recording cannot be specified in OpenCVFrameRecorder

[GoogleCodeExporter]

You can set the codec by calling setCodecID() before start(), and you can set 
the frame rate by calling setFrameRate(), again before calling start().

As for OpenCVFrameRecorder generally sucking, please try to use 
FFmpegFrameRecorder instead, as mentioned in the README.txt.

As for sound, OpenCV simply does not support for sound. FFmpeg does, and it 
would be possible to modify FFmpegFrameRecorder to accept sound packets along 
the image frames, but I have no plan to add this feature myself. If you make a 
new version of FFmpegFrameRecorder that supports sound, please let me know and 
I will add it to the next release, thank you

Original comment by [email protected] on 24 Feb 2011 at 4:59

[GoogleCodeExporter]

[deleted comment]

[GoogleCodeExporter]

Hi Samuel. I tried it with my colleague, and you are completely right. We also 
installed FFmpeg on the mac machine 
(http://stephenjungels.com/jungels.net/articles/ffmpeg-howto.html, 
http://www.youtube.com/watch?v=3srKCD3ok3w), and used FFmpegFrameRecorder 
instead of OpenCVFrameGrabber, which worked much better. The only remaining 
problem now is the speed at which it is grabbing frames for the video recorder 
(only about 2 - 3 per second max). We tried modifying the frame rate by using 
the setFrameRate function of FrameRecorder (recorder.setFrameRate(x.x)), but it 
did not improve. I realised that the actual video display itself (of the 
webcam), had a very low refresh rate! So we tried modifying the FrameGrabber 
frame rate (grabber.setFrameRate(x.x)) - However, by using 
grabber.getFrameRate(), we saw that it was already set on 0.0! Modifying these 
values did not improve it, and still the refresh rate is about 2 - 3 grabbed 
frames per second, so we cannot see real-time / live display of my webcam. Any 
advice is kindly appreciated!

Original comment by [email protected] on 25 Feb 2011 at 1:51

[GoogleCodeExporter]

I'm glad it works, marking as done.

On Mac, FFmpeg does not support camera capture, and OpenCV, well, sucks, so I'm 
afraid that if you are not satisfied with OpenCVFrameGrabber, you will need to 
use QuickTime directly to capture from your Webcam...

Original comment by [email protected] on 25 Feb 2011 at 2:54

• Changed state: Done

[GoogleCodeExporter]

This project may be of interest for your project:
    http://lti-civil.org/

Original comment by [email protected] on 25 Feb 2011 at 3:00