get back to single-version ffmpeg wrapper (no more v2); make sure the library builds and the tests pass on Ubuntu 10.04 that includes pretty old version of ffmpeg

3rdparty/ffmpeg/ffopencv.c

@@ -1 +1 @@
-#include "cap_ffmpeg_impl_v2.hpp"
+#include "cap_ffmpeg_impl.hpp"

CMakeLists.txt

@@ -369,7 +369,7 @@ if(UNIX)
         endif()
       endif()
       if(HAVE_FFMPEG_CODEC AND HAVE_FFMPEG_FORMAT AND HAVE_FFMPEG_UTIL)
-        if(HAVE_FFMPEG_SWSCALE OR NOT HAVE_GENTOO_FFMPEG)
+        if(HAVE_FFMPEG_SWSCALE)
             set(HAVE_FFMPEG 1)
         endif()
       endif()
@@ -382,12 +382,6 @@ if(UNIX)
       endif()
     endif()
 
-    if(HAVE_FFMPEG)
-      if(NOT ALIASOF_libavformat_VERSION VERSION_LESS "52.111.0")
-        set(NEW_FFMPEG ON)
-      endif()
-    endif()
-
     if(WITH_1394)
       CHECK_MODULE(libdc1394-2 HAVE_DC1394_2)
       if(NOT HAVE_DC1394_2)
@@ -455,7 +449,6 @@ if(APPLE AND WITH_FFMPEG)
             "${FFMPEG_LIB_DIR}/libavformat.a" "${FFMPEG_LIB_DIR}/libavutil.a"
             "${FFMPEG_LIB_DIR}/libswscale.a")
         set(HAVE_FFMPEG 1)
-        set(NEW_FFMPEG 1)
     endif()
     endif()
     endif()