[MPlayer-users] scratching sound on some dts files (passthrough)

[Rick W. Chen]

Ulion said the following on 26/11/07 01:59:
> 2007/11/25, Markus Rothe <markus at unixforces.net>:
>> Ulion wrote:
>>> Thanks great for your report, the difference between too dts is the
>>> broken has an odd fsize 2013,
>>> old mplayer have problem when swap byte endian for the last byte,
>>> recent svn already fixed that problem. So the bug you descripted will
>>> only happen on i386 machine and old mplayer, try newest svn and
>>> compile mplayer for yourself, it will works fine. Test ok on my intel
>>> machine with lastest svn source.
>> yes, confirmed. Newer mplayer fixed the problem. Thanks a lot!
>>
> 
> Great, thanks to Reimar, it's him fixed that bug two month ago.
> 


Hi there, I'm having this "scratching" problem with dts passthrough with
alsa's dmix plugin. with say, -ao alsa:device=iec958 it works well.

MPlayer dev-SVN-r25197-4.1.3 (C) 2000-2007 MPlayer Team
CPU: Intel(R) Core(TM)2 Duo CPU     E6750  @ 2.66GHz (Family: 6, Model:
15, Stepping: 11)
CPUflags:  MMX: 1 MMX2: 1 3DNow: 0 3DNow2: 0 SSE: 1 SSE2: 1
Compiled for x86 CPU with extensions: MMX MMX2 SSE SSE2
mplayer: could not connect to socket
mplayer: No such file or directory
Failed to open LIRC support. You will not be able to use your remote
control.

Playing dtsac3audiosample.avi.
AVI file format detected.
[aviheader] Video stream found, -vid 0
[aviheader] Audio stream found, -aid 1
VIDEO:  [XVID]  800x336  12bpp  23.976 fps  1086.1 kbps (132.6 kbyte/s)
Clip info:
 Software: Nandub v1.0rc2
==========================================================================
Opening video decoder: [ffmpeg] FFmpeg's libavcodec codec family
Selected video codec: [ffodivx] vfm: ffmpeg (FFmpeg MPEG-4)
==========================================================================
==========================================================================
Trying to force audio codec driver family hwac3...
Opening audio decoder: [hwac3] AC3/DTS pass-through S/PDIF
No accelerated IMDCT transform found
hwac3: switched to DTS, 768000 bps, 48000 Hz
AUDIO: 48000 Hz, 2 ch, ac3, 768.0 kbit/50.00% (ratio: 96000->192000)
Selected audio codec: [hwdts] afm: hwac3 (DTS through S/PDIF)
==========================================================================
[AO_ALSA] alsa-lib: conf.c:3949:(snd_config_expand) Unknown parameters
AES0=6
[AO_ALSA] alsa-lib: pcm.c:2145:(snd_pcm_open_noupdate) Unknown PCM
dmix-digital:AES0=6
AO: [alsa] 48000Hz 2ch ac3 (1 bytes per sample)
Starting playback...
VDec: vo config request - 800 x 336 (preferred colorspace: Planar YV12)
VDec: using Planar YV12 as output csp (no 0)
Movie-Aspect is 2.38:1 - prescaling to correct movie aspect.
VO: [xv] 800x336 => 800x336 Planar YV12
A:   0.7 V:   0.7 A-V:  0.002 ct:  0.005  17/ 17 10%  2%  0.1% 0 0
Exiting... (Quit)

do you think it's a problem with alsa, should I go report it there?

thanks,
Rick