[MEncoder-users] possible to explicity write duplicate frames?

[Lobster]

On 24/07/2012 9:17 a.m., Jeffrey Laut wrote:
> Is it possible to convert a video using mencoder, and have it write each
> frame that is a duplicate frame?
>
> I am recording webcam video with ffmpeg.  Usually the first 5 to 7 frames
> are duplicate frames, and then there may be couple more throughout the
> video.
>
> I am then using opencv to analyze the video, but opencv does not see the
> duplicate frames.  For example, if* *I tell ffmpeg to record at 10 fps for
> 300 seconds, I expect to have 3000 frames.  Indeed, when I convert the
> video from the uncompressed to compressed using mencoder, it says there are
> 3000 frames.  When I process the video using opencv, it is not counting the
> duplicate frames more than once, and therefore reporting less frames.
>
> I would like to have a video file where each frame is explicitly recorded.
>   Is this possible?
>
> The command I use for converting is;
>
> mencoder -nosound -ovc lavc -o video_converted.avi video.avi
>
>
> I have also tried using the "-noskip" command.  This removes the skipped
> frames from the video, which is not exactly what I want.  I want to have
> the duplicate frames written as individual frames in the video file.
>
>
> Thank you for any help.
> -Jeff
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>
>
You must use the harddup vf to encode duplicate frames,
and just to be safe specify the output frame rate.
I.E -vf harddup -ofps 10