[MPlayer-users] Segfault when using Trellis quantization

[Jose FC]

> >> > but when I enable Trellis quantization, Mencoder segfault's at the
> >> > very beginning of the encoding process.
>
> Try compiling Mplayer without optimization and with debug info
> (use something like CFLAGS="-O0 -g" ./configure; make except
> that I'm not sure how easy it's to compile mplayer with custom flags).
> The crash may likely go away when not using optimization... in
> that case compile with normal optimization but still with debug
> info (CFLAGS="-O3 -g").
>
> Then load mencoder with gdb:
> # gdb mencoder
>
> > set args <put your mencoder options here>
> > run
>
> [gdb should now display that it segfaulted, and the line.
> copy them and send on this list]
>
> > bt
>
> [copy the backtrace info too]
>
> If you're able to do this, it'll help greatly debugging.
>
> Btw, recently mplayer has given me too also often segfaults. Seems to be
> related to Xvideo (with -vo x11 seems to go away). Strange, I should
> investigate more I guess (1.0preXX).

I did what you said, and this was the result:

(gdb) run
Starting program: /usr/local/bin/mencoder -nosound -ovc lavc -fps 25 -ofps 25 
-lavcopts 
vcodec=mpeg2video:vbitrate=1200:vqmin=1:vrc_buf_size=230:vrc_minrate=500:vrc_maxrate=2000:mbd=2:keyint=25:vmax_b_frames=2:autoaspect:vlelim=-4:vcelim=7:vstrict=1:vpsize=1000:lumi_mask=0.05:dark_mask=0.01:tcplx_mask=0.2:scplx_mask=0.2:trell 
-sws 2 -vf hqdn3d,scale=480:576 -of mpeg -o test_out.mpg test.mpg
Warning:
Cannot insert breakpoint -2.
Error accessing memory address 0x4000bb50: Error de entrada/salida (I/O error)
The same program may be running in another process.
(gdb) bt
#0  0x40000a80 in ?? ()
Cannot access memory at address 0x0

	- Jose