[MPlayer-users] Extracting frames from videos on the command line

[geoff.mplayer at alphaworks.co.uk]

mplayer-users-request at mplayerhq.hu wrote:

>Message: 1
>Date: Thu, 06 Apr 2006 17:00:37 -0700
>From: RC <rcooley at spamcop.net>
>Subject: Re: [MPlayer-users] Extracting frames from videos on the
>	command line
>To: "MPlayer usage questions, feature requests,	bug reports"
>	<mplayer-users at mplayerhq.hu>
>Message-ID: <20060406170037.515c9dfd.rcooley at spamcop.net>
>Content-Type: text/plain; charset=US-ASCII
>
>On Fri, 07 Apr 2006 00:15:41 +0100
>Geoff Soper <geoff.mplayer at alphaworks.co.uk> wrote:
>
>  
>
>>mplayer -vo jpeg -frames 1 Words.mpg
>>    
>>
>
>Try more than 1 frame.  Everything seems to be fine.
>
>  
>
Ah, OK, that seems to work. It looks like it's generating one less than 
whatever is specified, any idea what is causing this? I'd like to be 
able to extract non-consecutive frame i.e. 4  frames a second assuming 
the film has more than 4 frames a second. I've tried using -fps but that 
seem to produce apparently random results. Is my only solution to 
extract every frame and then just pick from them afterwards?

Thanks,
Geoff