On Tuesday 08 April 2008, Vladimir Monchenko wrote:
> Hi,
>
> After updating vdr-1.6.0+softdevice+softplay+dvd I had a problem with
> playing ac3 sound tracks. I use a standard stereo a Line Out through
> ALSA snd-via82xx the driver on my Epia ME6000.
> If I play dvd disk (through dvd plugin) or avi file (through softplay)
> with ac3 sound track, one channel works only, which reproduces sound
> effects to film (explosions, impacts, music...). Similar, that it is
> sound Rear channel. Adjustment of a mixer to change this behaviour was
> not possible.
Maybe it's the same I noticed just with regular recordings which
have a ac3 track. Played sound seems to be from rear channels when
a stereo 2CH downmix is requested from softdevice setup. This request
is now ignored by ffmpeg and we get 6CH.
In ffmpeg I found, that with revision 10199 member request_channels was
introduced for selected number of output channels.
Please try attached patch.
> Prompt me, please, that it is necessary to correct?
Stefan Lucke
Index: mpeg2decoder.c
===================================================================
RCS file: /cvsroot/softdevice/softdevice/mpeg2decoder.c,v
retrieving revision 1.78
diff -U3 -r1.78 mpeg2decoder.c
--- mpeg2decoder.c 24 Dec 2007 11:43:31 -0000 1.78
+++ mpeg2decoder.c 12 Apr 2008 08:34:43 -0000
@@ -380,6 +380,9 @@
case 0:
// get the AC3 -> 2CH stereo data
context->channels = 2;
+#if 1 // find ffmpeg condition
+ context->request_channels = 2;
+#endif
break;
case 1:
{
@@ -417,10 +420,16 @@
case 2:
// get the AC3 -> 4CH stereo data
context->channels = 4;
+#if 1 // find ffmpeg condition
+ context->request_channels = 4;
+#endif
break;
case 3:
// set channels to auto mode to get decoded stream for analog out
context->channels = 0;
+#if 1 // find ffmpeg condition
+ context->request_channels = 0;
+#endif
break;
}
}
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