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Normally, video/audio/sub track selection is persistent across files played in the same mplayer instance. This is wanted, because settings should not be reset across files in general. However, if the track layout of a file is completely different from the previous, this will essentially select random tracks. In this case, keeping the track selection is confusing and unwanted. Reset the track selection to default if the track layout changes. The track layout is determined by number of tracks, track order, default flag, whether the track is an external subtitle, and track language. If a track layout change is detected when playing a new file, the -sid, -aid and -vid options are reset to "auto". This behavior is enabled only if the user selects tracks manually (via keybinds and the "switch_audio" slave properties etc.). If no user interactions take place, options specified on the command line will follow the old behavior.
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.