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This is required, as the Xv image is directly used for rendering OSD and taking screenshots. These involve libswscale, which wants aligned strides. There doesn't seem to be an easy way to request aligned strides from Xv. Simply request an image with an aligned width, which usually results in an aligned stride. The padding border remains invisible. One caveat is that if padding is added, there might be scaling artifacts on the right pixel border of the screen. This is at least the case with nvidia binary drivers. Since we consider vo_xv a sensible choice only on crappy/slow hardware, performance is more important than quality.
Compiling with full features requires development files for several external libraries. Below is a list of some important requirements. For more information see the output of './configure --help' for a list of options, or look at the list of enabled and disabled features printed after running './configure'. If you think you have support for some feature installed but configure fails to detect it, the file config.log may contain information about the reasons for the failure. Libraries specific to particular video output methods (you'll want at least one of VDPAU, GL or Xv): - libvdpau (for VDPAU output, best choice for NVIDIA cards) - libGL (OpenGL output) - libXv (XVideo output) general: - libasound (ALSA audio output) - various general X development libraries - libfreetype (for libass) - libfontconfig (for libass) - libass - FFmpeg libraries (libavutil libavcodec libavformat libswscale libpostproc) Most of the above libraries are available in suitable versions on normal Linux distributions. However FFmpeg is an exception (distro versions may be too old to work at all or work well). For that reason you may want to use the separately available build wrapper that first compiles FFmpeg libraries and libass, and then compiles the player statically linked against those.