[MacPorts] #43100: ffmpeg, ffmpeg-devel: switch to using SDL2

[MacPorts]

#43100: ffmpeg, ffmpeg-devel: switch to using SDL2
-----------------------------------+----------------------
  Reporter:  thomas.c.jansen@…     |      Owner:  devans@…
      Type:  enhancement           |     Status:  assigned
  Priority:  Normal                |  Milestone:
 Component:  ports                 |    Version:  2.2.1
Resolution:                        |   Keywords:
      Port:  ffmpeg, ffmpeg-devel  |
-----------------------------------+----------------------

Comment (by devans@…):

 libsdl is used to implement the sdl outdev (output device). Per the
 documentation (${prefix}/share/doc/ffmpeg/ffmpeg-devices.html, Section
 4.8)


 {{{
 This output device allows one to show a video stream in an SDL window.
 To enable this output device you need libsdl installed on your system when
 configuring your build.
 }}}

 When libsdl is installed at build time, it is what lets you play video
 interactively using ffmpeg or ffplay or programmatically using the
 libavdevice API.  It is the only outdev that is built by default by our
 ffmpeg port.

 So from what we both have said above, you have successfully built ffmpeg
 without this device support (no libsdl or libsdl2).
 I assume that the project you are working on uses ffmpeg for decoding of
 video and libsdl2 for display?

 However, to be sure you are getting what you want, removing the dependency
 on libsdl is not enough.  Other ports that use libsdl can install it
 behind your back (90+ of these). To prevent building this device whether
 libsdl is installed or not, it should be explicitly disabled using the
 configure option
 {{{
 --disable-outdev=sdl
 }}}

 I think you have a legitimate situation here so if I gave you a way to
 disable the sdl outdev, recognizing that it means you won't be able to
 display videos in a SDL window using ffmpeg or ffplay, would that meet
 your needs?

-- 
Ticket URL: <https://trac.macports.org/ticket/43100#comment:7>
MacPorts <http://www.macports.org/>
Ports system for OS X