[mythtv-users] mythdvd: 5.1 playback?

Paul Woodward paul_woodward at fastnet.co.uk
Sun Dec 7 07:27:57 EST 2003


I have set mine the same as below except -ao alsa9:iec958

I get the following output from mplayer:

Playing dvd://
Reading disc structure, please wait...
There are 3 titles on this DVD.
There are 23 chapters in this DVD title.
There are 1 angles in this DVD title.
DVD successfully opened.

Cache fill:  0.00% (0 bytes)    
Cache fill:  2.44% (204800 bytes)    
Cache fill:  8.59% (720896 bytes)    
Cache fill: 16.41% (1376256 bytes)    MPEG-PS file format detected.
VIDEO:  MPEG2  720x576  (aspect 3)  25.000 fps  8000.0 kbps (1000.0
kbyte/s)
========================================================================
==
Forced audio codec: hwac3
Opening audio decoder: [hwac3] AC3/DTS pass-through SP/DIF
No accelerated IMDCT transform found
hwac3: switched to AC3, 448000 bps, 48000 Hz
AUDIO: 48000 Hz, 2 ch, 16 bit (0x400), ratio: 56000->192000 (448.0 kbit)
Selected audio codec: [hwac3] afm:hwac3 (AC3 through SPDIF)
========================================================================
==
vo: X11 running at 1024x768 with depth 16 and 16 bpp (":0.0" => local
display)
Disabling DPMS
========================================================================
==
Opening video decoder: [mpegpes] MPEG 1/2 Video passthrough
VDec: vo config request - 720 x 576 (preferred csp: Mpeg PES)
Could not find matching colorspace - retrying with -vop scale...
Opening video filter: [scale]
The selected video_out device is incompatible with this codec.
VDecoder init failed :(
Opening video decoder: [libmpeg2] MPEG 1/2 Video decoder libmpeg2-v0.3.1
Selected video codec: [mpeg12] vfm:libmpeg2 (MPEG 1 or 2 (libmpeg2))
========================================================================
==
Checking audio filter chain for 48000Hz/2ch/16bit -> 48000Hz/2ch/8bit...
[format] Sample format big endian AC3  not yet supported 
Error at audio filter chain pre-init!
[pl_resample] Input audio format not yet suported. 
alsa-init: requested format: 48000 Hz, 2 channels, AC3
alsa-init: soundcard set to iec958:AES0=0x2,AES1=0x82,AES2=0x0,AES3=0x2
alsa9: 48000 Hz/2 channels/4 bpf/65536 bytes buffer/Signed 16 bit Little
Endian
AO: [plugin] 48000Hz 2ch AC3 (1 bps)
Building audio filter chain for 48000Hz/2ch/16bit -> 48000Hz/2ch/8bit...
[format] Sample format big endian AC3  not yet supported 
Couldn't find matching filter / ao format!
Starting playback...
VDec: vo config request - 720 x 576 (preferred csp: Planar YV12)
VDec: using Planar YV12 as output csp (no 0)
Movie-Aspect is 1.78:1 - prescaling to correct movie aspect.


Questions:
Why does it only pick up 2 channels? Should I run with -channels 6
Any ideas about : [format] Sample format big endian AC3  not yet
supported ?

I am running alsa 0.9.6.

Thanks, Paul


-----Original Message-----
From: mythtv-users-bounces at mythtv.org
[mailto:mythtv-users-bounces at mythtv.org] On Behalf Of Drew Bernat
Sent: 07 December 2003 04:27
To: Discussion about mythtv
Subject: Re: [mythtv-users] mythdvd: 5.1 playback?

On Sun, 7 Dec 2003, Paul Woodward wrote:

> Is it possible to get mythdvd to play with 5.1 channel audio? I am
using
> the onboard audio of an ABIT IS7, linked to an A/V receiver by an
> optical cable.

The short answer is yes :)

It depends on what program you're using to play DVDs. I use xine, where 
you can set up the configuration file to play 5.1 if it exists. Or 
mplayer, with the command line (everything after a # is a comment)

mplayer 
  -fs -zoon -quiet  # fullscreen, "quiet"
  -ao alsa9:nf $ ALSA driver, "nf" device which is the SP/DIF output
  -aop list=resample:fout=48000 # Resample to 48Khz, required for Nforce
  -af resample=48000 # See above
  -ac hwac3,    # comma is required -- hwac3 if it exists, otherwise
                # use the default decoder  
  -vo xv  # Video ouput
  %s # Filename

To explain some: I use an nforce output and ALSA to get SP/DIF output.
The 
nforce digital out can only play at 48Khz, hence the resample lines. The

hwac3 will output ac3 if it exists, and the comma will allow other files

to play.

Let me know if you're using xine, and I'll dig out the config file.

Drew

-- 
Drew Bernat                                                __ ____
abernat at zathras.net                                         |  | |
http://www.zathras.net                                         | |

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