[MacPorts] #17310: RFE: ffmpeg: change port version number to reflect current svn revision

[MacPorts]

#17310: RFE: ffmpeg: change port version number to reflect current svn revision
---------------------------------+------------------------------------------
 Reporter:  devans at macports.org  |       Owner:  acho at macports.com
     Type:  enhancement          |      Status:  new              
 Priority:  Normal               |   Milestone:  Port Enhancements
Component:  ports                |     Version:  1.6.0            
 Keywords:  version number       |        Port:  ffmpeg           
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 On their download page [http://www.ffmpeg.org/download.html], the ffmpeg
 developers say
 {{{
 FFmpeg has always been a very experimental and developer-driven
 project. It is a key component in many multimedia projects and has
 new features added constantly. New, official "releases" are few and
 far between. In short, if you want to work with FFmpeg, you are
 advised to go along with SVN development rather than relying on
 formal releases. SVN snapshots work really well 99% of the time so
 people are not afraid to use them.
 }}}
 and
 {{{
 If you are looking for a formal release, stop now, there are none.
 Maybe we will have some in the future, but don't hold your breath.
 }}}

 The ffmpeg port version is 0.4.9pre1_12.  This is the number of the last
 official release of ffmpeg which corresponds to svn revision 3298, Fri Jul
 9 20:08:33 2004 UTC, over 4 years ago.

 The current ffmpeg port svn revision is 14381 and ffmpeg itself reports
 its version as
 {{{
 $ ffmpeg --version
 FFmpeg version SVN-r14381, Copyright (c) 2000-2008 Fabrice Bellard, et al.
 }}}

 Based on this information, I propose that we change the ffmpeg
 port version to 0.4.9-${svn_rev} where ${svn_rev} is the current
 svn revision used in the port.

 I think this would yield a more informative and accurate version number
 that is consistent with the version the program itself reports but allows
 for possible future release numbers.

 I have attached a patch to make this change but in light of the fact that
 this change is a relatively significant one, I am asking for concurrence
 and/or comments from the port maintainer (even though the port is marked
 openmaintainer) before any such change is made.

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Ticket URL: <http://trac.macports.org/ticket/17310>
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