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Basically, the encoding code path wanted to set osdlevel=0 as default, while normal playback needs osdlevel=1. For this purpose, osdlevel was set to -1 (i.e. invalid) initially to detect whether the --osdlevel option was explicitly set. When encoding was not configured (CONFIG_ENCODING undefined), the osdlevel value was not set from -1 to 1 properly, and the OSD remained invisible by default. Fix this by getting rid of this logic. It shouldn't be needed, since osdlevel=1 never shows any OSD messages without user interaction. Should this ever change, we could still check whether encoding is in progress, or add another option to allow OSD rendering during encoding.
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.