The recorded video is played back at 5x speed

[bassill]

The recorded video is played back at 5x speed

[baSSiLL]

Hi
At first sight looks like frame sequence you provide to SharpAvi has an actual frame rate lower than the value you've set for an AVI file. This usually happen when time needed to process a single frame being recorded from a live source (like camera or screencast) is more than 1/FPS.
Could you put more details about your problem? Are you talking about the sample screencast app or your own program? If the latter, what is it purpose, how the recording process is implemented?

[anand1688]

Hi

I have used the same logic as the sample code.

I have modified it to capture just a particular application window.

Everything else is the same.If I record a video for 10 s the out put video length is 2s

[baSSiLL]

What frame rate do you set for a video? And what is an actual rate of screenshots you write to an output video stream? To get the latter, count how many frames have been written in total and divide that by recording time.

[anand1688]

Hi

Frame rate I have set at 10
FramesPerSecond=10
The frame interval to capture is deduced as
var time_between_capture=TimeSpan.FromSeconds((1 / (double)writer.FramesPerSecond));

Also if I select any other codec than MotionJpeg, I get an vfw exception

[baSSiLL]

Check the number of frames that have been actually written to the stream - AviVideoStream.FramesWritten property. Is it close to 10 * < total seconds > or 2 * < total seconds >?

[baSSiLL]

As for codecs failure. Whether you run the program in 32 or 64 bits? The only MPEG-4 codec I've found working reliably in 64 bits is x264vfw. Of course, its 64-bit version should be installed.

[anand1688]

hi

I recorded for 20 s approx at FramePerSecond=10 the value is 31.

[baSSiLL]

So the actual frame rate is ~1.5 frames/second! When player opens an AVI file it plays those frames at 10 fps because this value is stored in header hence the playback looks accelerated.
You need to find a reason why your capture pipeline does not keep up with target 10 fps. Measure which part of frame processing takes the most time - getting screenshot, writing to a stream, thread synchronization or image processing if you have any.

[anand1688]

Hi I found the issue,I was finding the window each time the capture was happenning

[baSSiLL]

Cool! Thanks for letting know.