segment: Add an option to prepend a string to the list entries

Useful to generate lists with absolute urls.

Signed-off-by: Luca Barbato <lu_zero@gentoo.org>
hls: Add an option to prepend a baseurl to the playlist entries

Useful to generate playlists with absolute paths.

Signed-off-by: Luca Barbato <lu_zero@gentoo.org>
mpegvideo: move the MpegEncContext fields used from arm asm to the beginning

This should reduce the frequency with which the offsets need to be
updated.
mpegvideo: remove unused MpegEncContext.b4_stride
h264: drop commented out cruft
avconv_dxva2: define all used GUIDs directly instead of relying on the dxva2api.h header

This avoids issues with inconsistent headers with different versions of mingw-w64 and older MSVC variants.

Fixes FATE builds of MSVC 2010.

Signed-off-by: Anton Khirnov <anton@khirnov.net>