ffmpeg or mplayer for avi conversion? Post: 302179840

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Top Forums Shell Programming and Scripting ffmpeg or mplayer for avi conversion? Post 302179840 by dotancohen on Friday 28th of March 2008 06:33:56 PM

03-28-2008

Registered User

ffmpeg or mplayer for avi conversion?

I need to output a summary of a video as an animated gif. Ideally, I would have 8 equally-spaced frames from the video, and play them back one at a time, each for 0.25 seconds. So I'd have a 2 second animated gif.

This is what I have so far:

Code:

#!/bin/bash
mplayer "$@" -vo gif89a:output="$@".gif:fps=1 -vf scale=640:480 -endpos 8 -really-quiet

As you can see, I'm taking eight frames from the first eight seconds of video. What can I use to take eight frames from $timeOfVideo/7 time periods. Note that I'm dividing the time of the video by 7, not 8, so that I will have the first and last frames of the video in the gif.

My second problem is shortening the duration that each frame is shown. Currently, each frame is shown for 1 second. How can I reduce that to 0.25 seconds?

I am starting to think that ffmpeg is a better tool for the job, however, surprisingly I cannot find relevant examples in Google. Can ffmpeg do what I need? Can mplayer, for that matter? Something else?

Thanks in advance.

dotancohen

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LEARN ABOUT XFREE86

ng_gif_demux

NG_GIF_DEMUX(4) 					   BSD Kernel Interfaces Manual 					   NG_GIF_DEMUX(4)

NAME

     ng_gif_demux -- demultiplexer for packets from ng_gif(4) nodes

SYNOPSIS

     #include <netgraph/ng_gif_demux.h>

DESCRIPTION

     The ng_gif_demux netgraph node type demultiplexes the output from ng_gif(4) nodes in the netgraph(4) networking subsystem.

     The gif hook is meant to be connected to the lower or orphans hook of an ng_gif(4) node.  The inet, inet6, atalk, ipx, atm, natm, and ns
     hooks output frames of the given type when they are received on the gif hook.  When a frame is received on one of these hooks, it is encapsu-
     lated and sent out the gif hook.

HOOKS

     This node type supports the following hooks:

     gif    Connection to the lower or orphans hook of an ng_gif(4) node.

     inet   Hook for input and output of IP frames.

     inet6  Hook for input and output of IPv6 frames.

     atalk  Hook for input and output of AppleTalk frames.

     ipx    Hook for input and output of IPX frames.

     atm    Hook for input and output of ATM frames.

     natm   Hook for input and output of NATM frames.

     ns     Hook for input and output of NS frames.

CONTROL MESSAGES

     This node type supports only the generic control messages.

SEE ALSO

     gif(4), netgraph(4), netintro(4), ng_gif(4), ifconfig(8), ngctl(8), nghook(8)

AUTHORS

     Brooks Davis <brooks@FreeBSD.org>

BSD
								September 18, 2001							       BSD