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

[Jindrich Makovicka]

On Wed, 30 Apr 2008 10:14:15 +0200
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).

I have a similar issue, and I am beginning to suspect that there is
something rotten in ALSA's silence stuffing logic, and the
sound distortion problems are triggered by delays in the decoding
introduced by cpu-intensive filters, rather than by the memory errors.

If you are using -ao alsa, could you

1) try the same with oss

2) try out the following patch?

--- libao2/ao_alsa.c	(revision 26650)
+++ libao2/ao_alsa.c	(working copy)
@@ -690,6 +690,7 @@
 	       snd_strerror(err));
 	return 0;
       }
+#if 0
 #if SND_LIB_VERSION >= 0x000901
       /* play silence when there is an underrun */
       if ((err = snd_pcm_sw_params_set_silence_size(alsa_handler,
alsa_swparams, boundary)) < 0) { @@ -698,6 +699,7 @@
 	return 0;
       }
 #endif
+#endif
       if ((err = snd_pcm_sw_params(alsa_handler, alsa_swparams)) < 0) {
 	mp_msg(MSGT_AO,MSGL_ERR,MSGTR_AO_ALSA_UnableToGetSwParameters,
 	       snd_strerror(err));

Regards,
-- 
Jindrich Makovicka