[MPlayer-users] Mplayer & DD5.1 via SPDIF - I have only DD2.0: why ?

Tue Dec 27 00:35:44 CET 2005

On Monday, 26 December 2005 at 22:46, Sasza wrote:
> Hi all,
> 
> I have DIVX file with 5.1 sound, and I want to play it via MPLAYER.
> My MythTV (R5A22) system is connected via digital SPDIF connection to my 
> Home theater aplituner.
> 
> Launching mplayer with various parameters gives at best DD2.0 sound.
> DD5.1 is impossible :-(
> I spend literally days to trying solve this issue (many hours googilng & 
> searching various forums)
> System is: EPIA M10k, KnoppMythR5A22.
> Used AVI file plays nicely DD5.1 under xine (unfortunately xine CPU 
> consumption is about 50% vs 25% in mplayer. Also I have problem with AVI 
> subtitles in xine)
> 
> Pls find below mplayer logs for different cmd line option used:
> 
> 
> 1. "mplayer -channels 6 -ao alsa -ac hwac3, file.avi"
> Result: avi played 2 times too fast, amplituner connected to SPDIF shows 
> no audio
> Here is log:
> ------------------------------------------------------------------------------------------------------------------------------------
> MPlayer 1.0pre6-3.3.5 (C) 2000-2004 MPlayer Team
> CPU: IDT/Centaur/VIA C3 Nehemiah (Family: 6, Stepping: 5)
> Detected cache-line size is 32 bytes
> CPUflags:  MMX: 1 MMX2: 1 3DNow: 0 3DNow2: 0 SSE: 1 SSE2: 0
> Compiled with runtime CPU detection - WARNING - this is not optimal!
> To get best performance, recompile MPlayer with 
> --disable-runtime-cpudetection.
> Setting up LIRC support...
> Playing Motorhead - Stage Fright 05'.avi.
> AVI file format detected.
> VIDEO:  [XVID]  592x320  12bpp  25.000 fps  1719.7 kbps (209.9 kbyte/s)
> Clip info:
>  Software: VirtualDubMod 1.5.10.1 (build 2439/release)
> ==========================================================================
> Forced audio codec: hwac3
> Opening audio decoder: [hwac3] AC3/DTS pass-through SP/DIF
> hwac3: switched to AC3, 448000 bps, 48000 Hz
> AUDIO: 48000 Hz, 2 ch, 16 bit (0x400), ratio: 56000->192000 (448.0 kbit)

Looks like source audio is only stereo, so you won't get 6 channels unless
you explicitly add them and mix them. See -af surround or -af pan.

> Selected audio codec: [hwac3] afm:hwac3 (AC3 through SPDIF)
> ==========================================================================
> vo: X11 running at 1024x768 with depth 24 and 32 bpp (":0.0" => local 
> display)
> ==========================================================================
> Opening video decoder: [ffmpeg] FFmpeg's libavcodec codec family
> Selected video codec: [ffodivx] vfm:ffmpeg (FFmpeg MPEG-4)
> ==========================================================================
> Checking audio filter chain for 48000Hz/2ch/16bit -> 48000Hz/6ch/8bit...
> AF_pre: af format: 2 bps, 2 ch, 48000 hz, big endian AC3
> AF_pre: 48000Hz 2ch AC3
> alsa-init: soundcard set to surround51
> alsa: 48000 Hz/6 channels/12 bpf/61440 bytes buffer/Signed 16 bit Little 
> Endian
> AO: [alsa] 48000Hz 6ch AC3 (1 bps)
> Building audio filter chain for 48000Hz/2ch/16bit -> 48000Hz/6ch/8bit...
> Starting playback...
> VDec: vo config request - 592 x 320 (preferred csp: Planar YV12)
> VDec: using Planar YV12 as output csp (no 0)
> Movie-Aspect is 1.85:1 - prescaling to correct movie aspect.
> VO: [xv] 592x320 => 592x320 Planar YV12
> A:   0.3 V:   0.0 A-V:  0.320 ct:  0.000   1/  1 ??% ??% ??,?% 1 0
> ------------------------------------------------------------------------------------------------------------------------------------ 
> 
> 
> 
> 2. "mplayer -channels 6 -ac hwac3, file.avi"
> Result: avi played 2 times too fast, amplituner connected to SPDIF shows 
> 2.0 PCM 48kHz, sound is loud trash
> Here is log:
> ---------------------------------------------------------------------------------------------------------------------------------
> ..................
> Software: VirtualDubMod 1.5.10.1 (build 2439/release)
> ==========================================================================
> Forced audio codec: hwac3
> Opening audio decoder: [hwac3] AC3/DTS pass-through SP/DIF
> hwac3: switched to AC3, 448000 bps, 48000 Hz
> AUDIO: 48000 Hz, 2 ch, 16 bit (0x400), ratio: 56000->192000 (448.0 kbit)

Same here.

> Selected audio codec: [hwac3] afm:hwac3 (AC3 through SPDIF)
> ==========================================================================
> vo: X11 running at 1024x768 with depth 24 and 32 bpp (":0.0" => local 
> display)
> ==========================================================================
> Opening video decoder: [ffmpeg] FFmpeg's libavcodec codec family
> Selected video codec: [ffodivx] vfm:ffmpeg (FFmpeg MPEG-4)
> ==========================================================================
> Checking audio filter chain for 48000Hz/2ch/16bit -> 48000Hz/6ch/8bit...
> AF_pre: af format: 2 bps, 2 ch, 48000 hz, big endian AC3
> AF_pre: 48000Hz 2ch AC3
> AO: [oss] 48000Hz 6ch Signed 16-bit (Little-Endian) (2 bps)
> Building audio filter chain for 48000Hz/2ch/16bit -> 48000Hz/6ch/16bit...
> Starting playback...
> VDec: vo config request - 592 x 320 (preferred csp: Planar YV12)
> VDec: using Planar YV12 as output csp (no 0)
> Movie-Aspect is 1.85:1 - prescaling to correct movie aspect.
> VO: [xv] 592x320 => 592x320 Planar YV12
> A:   0.4 V:   0.0 A-V:  0.352 ct:  0.000   1/  1 ??% ??% ??,?% 1 0       ---
> ---------------------------------------------------------------------------------------------------------------------------------
> 
> 
> 3. "mplayer -channels 6 -ao alsa file.avi"
> Result: avi played OK, amplituner connected to SPDIF shows 2.0 PCM 
> 48kHz, audio is OK
> Here is log:
> ---------------------------------------------------------------------------------------------------------------------------------
> ....................
> Software: VirtualDubMod 1.5.10.1 (build 2439/release)
> ==========================================================================
> Opening audio decoder: [liba52] AC3 decoding with liba52
> AC3: 5.1 (3f+2r+lfe)  48000 Hz  448.0 kbit/s
> AUDIO: 48000 Hz, 6 ch, 16 bit (0x10), ratio: 56000->576000 (448.0 kbit)

But not here. This is 5.1 audio.

> Selected audio codec: [a52] afm:liba52 (AC3-liba52)
> ==========================================================================
> vo: X11 running at 1024x768 with depth 24 and 32 bpp (":0.0" => local 
> display)
> ==========================================================================
> Opening video decoder: [ffmpeg] FFmpeg's libavcodec codec family
> Selected video codec: [ffodivx] vfm:ffmpeg (FFmpeg MPEG-4)
> ==========================================================================
> Checking audio filter chain for 48000Hz/6ch/16bit -> 48000Hz/6ch/16bit...
> AF_pre: af format: 2 bps, 6 ch, 48000 hz, little endian signed int
> AF_pre: 48000Hz 6ch Signed 16-bit (Little-Endian)
> alsa-init: soundcard set to surround51
> alsa: 48000 Hz/6 channels/12 bpf/61440 bytes buffer/Signed 16 bit Little 
> Endian
> AO: [alsa] 48000Hz 6ch Signed 16-bit (Little-Endian) (2 bps)
> Building audio filter chain for 48000Hz/6ch/16bit -> 48000Hz/6ch/16bit...
> Starting playback...
> VDec: vo config request - 592 x 320 (preferred csp: Planar YV12)
> VDec: using Planar YV12 as output csp (no 0)
> Movie-Aspect is 1.85:1 - prescaling to correct movie aspect.
> VO: [xv] 592x320 => 592x320 Planar YV12
> A:   0.1 V:   0.0 A-V:  0.107 ct:  0.000   1/  1 ??% ??% ??,?% 0 0 
> 
> ---------------------------------------------------------------------------------------------------------------------------------
> 
> So now I'm confused:
> "mplayer -channels 6 -ao alsa -ac hwac3, file.avi" gives "Opening audio 
> decoder: [hwac3] AC3/DTS pass-through SP/DIF" but
> "AUDIO: 48000 Hz, 2 ch, 16 bit (0x400), ratio: 56000->192000 (448.0 kbit)"
> Later in log I see:
> "................
> Checking audio filter chain for 48000Hz/2ch/16bit -> 48000Hz/6ch/8bit...
> AF_pre: af format: 2 bps, 2 ch, 48000 hz, big endian AC3
> AF_pre: 48000Hz 2ch AC3
> alsa-init: soundcard set to surround51
> alsa: 48000 Hz/6 channels/12 bpf/61440 bytes buffer/Signed 16 bit Little 
> Endian
> AO: [alsa] 48000Hz 6ch AC3 (1 bps)
> Building audio filter chain for 48000Hz/2ch/16bit -> 48000Hz/6ch/8bit...
> ................."
> So what is current audio mode in mplayer and alsa: 6ch or 2ch ?

2ch audio is played on 6ch output.

> Oh the other hand, launching "mplayer -channels 6 -ao alsa file.avi" I get:
> ".....
> Opening audio decoder: [liba52] AC3 decoding with liba52
> AC3: 5.1 (3f+2r+lfe)  48000 Hz  448.0 kbit/s
> AUDIO: 48000 Hz, 6 ch, 16 bit (0x10), ratio: 56000->576000 (448.0 kbit)
> Selected audio codec: [a52] afm:liba52 (AC3-liba52)
> ...."
> and later
> ".....
> Checking audio filter chain for 48000Hz/6ch/16bit -> 48000Hz/6ch/16bit...
> AF_pre: af format: 2 bps, 6 ch, 48000 hz, little endian signed int
> AF_pre: 48000Hz 6ch Signed 16-bit (Little-Endian)
> alsa-init: soundcard set to surround51
> alsa: 48000 Hz/6 channels/12 bpf/61440 bytes buffer/Signed 16 bit Little 
> Endian
> AO: [alsa] 48000Hz 6ch Signed 16-bit (Little-Endian) (2 bps)
> Building audio filter chain for 48000Hz/6ch/16bit -> 48000Hz/6ch/16bit...
> ....."
> It looks like we have 6ch in alsa, but sound is DD2.0 - why ?

In this last case, too? It looks to me it's playing 6ch audio on 6ch output
(decoded, not passed through though).

Regards,
R.

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