[MPlayer-dev-eng] Known bugs section obsolete?

[Diego Biurrun]

Hi!

Please have a look at the known bugs section and tell me which if any of
these problems are still present.  I am tempted to rip this section out
since it is largely outdated and unmaintained.  This is probably not the
best solution.  Any ideas for a better way to track known problems and
workarounds?  Some of this might go in the FAQ, some might go to
sound.html or video.html, but maybe a separate problem section is
better.  Opinions?

Diego

Here is the known bugs section for easy reference:

Special system/CPU-specific bugs/problems:

    * SIGILL (signal 4) on P3 using 2.2.x kernels:
      Problem: kernel 2.2.x doesn't have proper (working) SSE support
      Solution: upgrade kernel to 2.4.x
      Workaround: ./configure --disable-sse
    * General SIGILL (signal 4):
      Problem: you compiled and run mplayer in different machines (for example compiled on P3 and running on Celeron)
      Solution: compile MPlayer on the same machine where you will use it!
      Workaround: ./configure --disable-sse etc. options
    * "Internal buffer inconsistency" during MEncoder run:
      Problem: known problem when lame < 3.90 was compiled with gcc 2.96 or 3.x.
      Solution: use lame >=3.90.
      Workaround: compile lame with gcc 2.95.x and remove any already installed lame packages, they may have been compiled with gcc 2.96.
    * Messed up MP2/MP3 sound on PPC:
      Problem: known GCC miscompilation bug on PPC platforms, no fix yet.
      Workaround: use FFmpeg's (slow) MP1/MP2/MP3 decoder (-ac ffmpeg)
    * sig11 in libmpeg2, when scaling+encoding:
      Problem: known GCC 2.95.2 MMX bug, upgrade to 2.95.3.

Various A-V sync and other audio problems:
General audio delay or jerky sound (exists with all or many files):

    * most common: buggy audio driver! - try to use different drivers, try ALSA 0.9 OSS emulation with -ao oss, also try -ao sdl, sometimes it helps. If your file plays fine with -nosound, then you can be sure it's sound card (driver) problem.
    * audio buffer problems (buffer size badly detected)
      Workaround: mplayer -abs option
    * samplerate problems - maybe your card doesn't support the samplerate used in your files - try the resampling plugin (-aop)
    * slow machine (CPU or VGA)
      try with -vo null, if it plays well, then you have slow VGA card/driver
      Workaround: buy a faster card or read this documentation about how to speed up
      Also try -framedrop

Audio delay/de-sync specific to one or a few files:

    * bad file
      Workaround:
          o -ni or -nobps option (for non-interleaved or bad files)
            and/or
          o -mc 0 (required for files with badly interleaved VBR audio)
            and/or
          o -delay option or +/- keys at runtime to adjust delay
      If none of these help, please upload the file, we'll check (and fix).
    * your sound card doesn't support 48kHz playback
      Workaround: buy a better sound card... or try to decrease fps by 10% (use -fps 27 for a 30fps movie) or use the resampler plugin
    * slow machine
      (if A-V is not around 0, and the last number in the status line increasing)
      Workaround: -framedrop

No sound at all:

    * your file uses an unsupported audio codec
      Workaround: read the documentation and help us adding support for it

No picture at all (just plain grey/green window):

    * your file uses an unsupported video codec
      Workaround: read the documentation and help us adding support for it
    * auto-selected codec can't decode the file, try to select another using -vc or -vfm options
    * you try to play DivX 3.x file with OpenDivX decoder or XviD (-vc odivx) - install Divx4Linux and recompile player

Video-out problems:

First note: options -fs -vm and -zoom are just recommendations, not (yet) supported by all drivers. So it isn't a bug if it doesn't work. Only a few driver supports scaling/zooming, don't expect this from x11 or dga.

OSD/sub flickering:
- x11 driver: sorry, it can't be fixed now
- xv driver: use -double option

Green image using mga_vid (-vo mga / -vo xmga):
- mga_vid misdetected your card's RAM amount, reload it using mga_ram_size option