[MPlayer-dev-eng] mplayer-1.0rc2: fspp is broken

[Ivan Kalvachev]

On Wed, Apr 30, 2008 at 11:14 AM, Denys Vlasenko
<vda.linux at googlemail.com> wrote:
> Hello,
>
>  mplayer-1.0rc1 was working ok for me. rc2 seems
>  to have problems with fspp.
>
>  mplayer -vf fspp=5:1:6 movie.avi - produces loud
>  hissing sound instead of normal audio (video seems
>  to be ok).
>
>  mplayer -vf scale=1280 movie.avi - works as expected
>  (movie is scaled up, sound is ok).
>
>  mplayer -vf scale=1280,fspp=5:1:6 movie.avi -
>  again hissing sound, and the movie is not scaled!
>
>  I also observed a case when -vf crop=XXXXX worked
>  but -vf crop=XXXXX,fspp=5:1:6 complained about
>  one of crop parameters being wrong (!).
>
>  It seems that fspp scribbles over unrelated memory areas,
>  producing random breakage.
>
>  I googled for it and I am definitely not the only one
>  seeing this. Some people experience this and some are not.
>  For some, it seems compiler-dependent.
>
>  Unfortunately the most informative post I found still was
>  too terse:
>
>  "
>  Compiler did not align stack variables. Libavcodec has been miscompiled
>  and may be very slow or crash. This is not a bug in libavcodec,
>  but in the compiler. You may try recompiling using gcc >= 4.2.
>  Do not report crashes to FFmpeg developers.
>  "
>
>  Seeing this, I rebuilt mplayer with -mpreferred-stack-boundary=4
>  but problems remain.
>
>  My gcc is version 4.2.1.
>
>  Help?

First this is bugreport, and they don't belong to this maillist.

Second, rc2 is 9 months old, there have been many fixes. Use current svn.

Third, video causing audio issue indeed sounds like memory corruption
(writing out of bounds), valgrind is rather good at detecting these. I
find it strange gcc421 to cause stack align warning, as it is supposed
to have fixed this issue.

There are bugreport guidelines in the documentation, follow them (how
to compile with debug support, what info to collect, where to send
it).