[FFmpeg-user] How to slow down video playback?

Simon Thelen ffmpeg-user at c-14.de
Sun Dec 28 19:01:39 CET 2014

On 14-12-28 at 18:33, Virgil Stokes wrote:
> I have used FFmpeg to extract PNG images for each frame of some short AVI files. 
> These AVIs were created for a research project in which a person's movements 
> were recorded over about 2 seconds at 25 fps.  These extracted images are then 
> processed and graphical objects are often superimposed on them; but, the PNG 
> images are always kept at the same size (720 x 576 Px).
> I use FFmpeg to merge these new PNG images back into an AVI file; then use Miro 
> to convert the AVI to an MP4.The problem that I have been unable to solve is 
> that when I playback this MP4 file in an HTML5 video player with FireFox (or 
> Chrome or IE) they are so short that the viewer has little chance to examine 
> them.  I would like to be able to show them frame-by-frame; but, this apparently 
> is a rather difficult problem for the HTML5 video player.
> Is it possible to use FFmpeg to create a very slow AVI (e.g. 1 frame per second) 
> or an MP4 file directly, that would allow the user to study the individual 
> images? I would be glad to provide one of these short AVIs for testing purposes 
> if needed.

Has examples and everything.

Simon Thelen

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