symbols that would be hidden by the visibility patch, thus allowing VLC usage
with patched FFMPEG code, and sanitise the need for accessing non-public
symbols. Patch by Diego Petteno (flameeyes at gentoo do org).

   bank instead of being fprintf'd to stderr.

   checks for frequencies and bitrates in MPEG audio.

   repeat_first_field handling.

(da big courmischage)

 * modules/codec/ffmpeg/video.c: Better handling of aspect ratio change.

   (default values borrowed from ffmpeg).

* modules/codec/ffmpeg/*, modules/stream_out/switcher.c: fix compilation with new ffmpeg versions (use native timebase).

* include/vlc_common.h, include/modules_inner.h, modules/codec/ffmpeg/: MSVC build fixes by Steve Lhomme (steve dot lhomme at free dot fr) + IMPORT_SYMBOL change by me.

* ffmpeg/encoder.c: if p_codec->pix_ftms is not yet available in this version of ffmpeg, then we just pray...?
 At least now it compiles again. Gildas, could you check if this is correct please?

* modules/codec/ffmpeg/encoder.c: sanity check for frames in the past that libavcodec really doesn't like.

  - added fourcc for SNOW and DTS.
  - added 'qscale' (fixed quantizer scale - VBR) and 'strict' (standard compliance) encoding options.

  + convention is to use '-' in composed option names (not '_').

* modules/stream_out/duplicate.c: small coding style changes.
* modules/stream_out/transcode.c:
  + Forward the aopts{foo=bar,etc..} and vopts={foo=bar,etc...} options to the encoders.
  + Got rid of the ffmpeg encoder specific options.
* modules/codec/ffmpeg/*:
  + Changed the encoder options to normal config options.
  + Parse the options forwarded by transcode.
* include/vlc_codec.h:
  + encoder_t cleanup.
  + include a "sout_cfg_t *" in encoder_t to allow passing options.

* modules/codec/ffmpeg/*: use av_free() instead of free() where necessary.