[MPlayer-users] Force input sample rate

[James Ausmus]

Hello all - I have a quick question regarding MPlayer command-line
opts. I can't seem to find a way to "force" the input sample rate that
mplayer uses. My simple test is to cat an mp3 file to mplayer reading
stdin - no matter what I pass in, mplayer doesn't properly detect the
44100 Hz sample rate. Here's a couple of example output captures:

Direct Play (plays correctly):

jausmus at jausmus-gentoo-dev ~/Music/Amazon MP3/The Who/Who Are You $
mplayer 14\ -\ Who\ Are\ You\ \(Lost\ Verse\ Mix\).mp3
MPlayer SVN-r28734-4.3.3 (C) 2000-2009 MPlayer Team
Can't open joystick device /dev/input/js0: No such file or directory
Can't init input joystick

Playing 14 - Who Are You (Lost Verse Mix).mp3.
Audio only file format detected.
Clip info:
 Title: Who Are You
 Artist: The Who
 Album: Who Are You
 Year: 1996
 Comment: Amazon.com Song ID: 20868783
 Track: 14
 Genre: Rock
==========================================================================
Opening audio decoder: [mp3lib] MPEG layer-2, layer-3
AUDIO: 44100 Hz, 2 ch, s16le, 256.0 kbit/18.14% (ratio: 32000->176400)
Selected audio codec: [mp3] afm: mp3lib (mp3lib MPEG layer-2, layer-3)
==========================================================================
[AO OSS] audio_setup: Can't open audio device /dev/dsp: No such file
or directory
AO: [alsa] 44100Hz 2ch s16le (2 bytes per sample)



stdin Play w/ no opts:

jausmus at jausmus-gentoo-dev ~/Music/Amazon MP3/The Who/Who Are You $
cat 14\ -\ Who\ Are\ You\ \(Lost\ Verse\ Mix\).mp3 | mplayer -
MPlayer SVN-r28734-4.3.3 (C) 2000-2009 MPlayer Team
Can't open joystick device /dev/input/js0: No such file or directory
Can't init input joystick

Playing -.
Reading from stdin...
Cannot seek backward in linear streams!
Seek failed
Cannot seek backward in linear streams!
Seek failed
Cannot seek backward in linear streams!
Seek failed
Cannot seek backward in linear streams!
Seek failed
Cannot seek backward in linear streams!
Seek failed
Cannot seek backward in linear streams!
Seek failed
Cannot seek backward in linear streams!
Seek failed
Cannot seek backward in linear streams!
Seek failed
Cannot seek backward in linear streams!
Seek failed
Cannot seek backward in linear streams!
Seek failed
Cannot seek backward in linear streams!
Seek failed
Cannot seek backward in linear streams!
Seek failed
Cannot seek backward in linear streams!
Seek failed
Cannot seek backward in linear streams!
Seek failed
Cannot seek backward in linear streams!
Seek failed
Cannot seek backward in linear streams!
Seek failed
Cannot seek backward in linear streams!
Seek failed
Cannot seek backward in linear streams!
Seek failed
Audio only file format detected.
==========================================================================
Opening audio decoder: [mp3lib] MPEG layer-2, layer-3
AUDIO: 32000 Hz, 2 ch, s16le, 320.0 kbit/31.25% (ratio: 40000->128000)
Selected audio codec: [mp3] afm: mp3lib (mp3lib MPEG layer-2, layer-3)
==========================================================================
[AO OSS] audio_setup: Can't open audio device /dev/dsp: No such file
or directory
AO: [alsa] 32000Hz 2ch s16le (2 bytes per sample)



stdin play variant 1:

jausmus at jausmus-gentoo-dev ~/Music/Amazon MP3/The Who/Who Are You $
cat 14\ -\ Who\ Are\ You\ \(Lost\ Verse\ Mix\).mp3 | mplayer -demuxer
audio -
MPlayer SVN-r28734-4.3.3 (C) 2000-2009 MPlayer Team
Can't open joystick device /dev/input/js0: No such file or directory
Can't init input joystick

Playing -.
Reading from stdin...
Cannot seek backward in linear streams!
Seek failed
Cannot seek backward in linear streams!
Seek failed
Audio only file format detected.
==========================================================================
Opening audio decoder: [mp3lib] MPEG layer-2, layer-3
AUDIO: 12000 Hz, 2 ch, s16le, 32.0 kbit/8.33% (ratio: 4000->48000)
Selected audio codec: [mp3] afm: mp3lib (mp3lib MPEG layer-2, layer-3)
==========================================================================
[AO OSS] audio_setup: Can't open audio device /dev/dsp: No such file
or directory
AO: [alsa] 12000Hz 2ch s16le (2 bytes per sample)



stdin play variant 2:

jausmus at jausmus-gentoo-dev ~/Music/Amazon MP3/The Who/Who Are You $
cat 14\ -\ Who\ Are\ You\ \(Lost\ Verse\ Mix\).mp3 | mplayer -srate
44100 -
MPlayer SVN-r28734-4.3.3 (C) 2000-2009 MPlayer Team
Can't open joystick device /dev/input/js0: No such file or directory
Can't init input joystick

Playing -.
Reading from stdin...
Cannot seek backward in linear streams!
Seek failed
Cannot seek backward in linear streams!
Seek failed
Cannot seek backward in linear streams!
Seek failed
Cannot seek backward in linear streams!
Seek failed
Cannot seek backward in linear streams!
Seek failed
Cannot seek backward in linear streams!
Seek failed
Cannot seek backward in linear streams!
Seek failed
Cannot seek backward in linear streams!
Seek failed
Cannot seek backward in linear streams!
Seek failed
Cannot seek backward in linear streams!
Seek failed
Cannot seek backward in linear streams!
Seek failed
Cannot seek backward in linear streams!
Seek failed
Cannot seek backward in linear streams!
Seek failed
Cannot seek backward in linear streams!
Seek failed
Cannot seek backward in linear streams!
Seek failed
Cannot seek backward in linear streams!
Seek failed
Cannot seek backward in linear streams!
Seek failed
Cannot seek backward in linear streams!
Seek failed
Audio only file format detected.
==========================================================================
Opening audio decoder: [mp3lib] MPEG layer-2, layer-3
AUDIO: 32000 Hz, 2 ch, s16le, 320.0 kbit/31.25% (ratio: 40000->128000)
Selected audio codec: [mp3] afm: mp3lib (mp3lib MPEG layer-2, layer-3)
==========================================================================
[AO OSS] audio_setup: Can't open audio device /dev/dsp: No such file
or directory
AO: [alsa] 44100Hz 2ch s16le (2 bytes per sample)



stdin play variant 3:

jausmus at jausmus-gentoo-dev ~/Music/Amazon MP3/The Who/Who Are You $
cat 14\ -\ Who\ Are\ You\ \(Lost\ Verse\ Mix\).mp3 | mplayer -srate
44100 -demuxer audio -
MPlayer SVN-r28734-4.3.3 (C) 2000-2009 MPlayer Team
Can't open joystick device /dev/input/js0: No such file or directory
Can't init input joystick

Playing -.
Reading from stdin...
Cannot seek backward in linear streams!
Seek failed
Cannot seek backward in linear streams!
Seek failed
Audio only file format detected.
==========================================================================
Opening audio decoder: [mp3lib] MPEG layer-2, layer-3
AUDIO: 12000 Hz, 2 ch, s16le, 32.0 kbit/8.33% (ratio: 4000->48000)
Selected audio codec: [mp3] afm: mp3lib (mp3lib MPEG layer-2, layer-3)
==========================================================================
[AO OSS] audio_setup: Can't open audio device /dev/dsp: No such file
or directory
AO: [alsa] 44100Hz 2ch s16le (2 bytes per sample)



stdin play variant 4:

jausmus at jausmus-gentoo-dev ~/Music/Amazon MP3/The Who/Who Are You $
cat 14\ -\ Who\ Are\ You\ \(Lost\ Verse\ Mix\).mp3 | mplayer -rawaudio
rate=44100 -demuxer audio -
MPlayer SVN-r28734-4.3.3 (C) 2000-2009 MPlayer Team
Can't open joystick device /dev/input/js0: No such file or directory
Can't init input joystick

Playing -.
Reading from stdin...
Cannot seek backward in linear streams!
Seek failed
Cannot seek backward in linear streams!
Seek failed
Audio only file format detected.
==========================================================================
Opening audio decoder: [mp3lib] MPEG layer-2, layer-3
AUDIO: 12000 Hz, 2 ch, s16le, 32.0 kbit/8.33% (ratio: 4000->48000)
Selected audio codec: [mp3] afm: mp3lib (mp3lib MPEG layer-2, layer-3)
==========================================================================
[AO OSS] audio_setup: Can't open audio device /dev/dsp: No such file
or directory
AO: [alsa] 12000Hz 2ch s16le (2 bytes per sample)



stdin play variant 5:

jausmus at jausmus-gentoo-dev ~/Music/Amazon MP3/The Who/Who Are You $
cat 14\ -\ Who\ Are\ You\ \(Lost\ Verse\ Mix\).mp3 | mplayer -rawaudio
rate=44100 -
MPlayer SVN-r28734-4.3.3 (C) 2000-2009 MPlayer Team
Can't open joystick device /dev/input/js0: No such file or directory
Can't init input joystick

Playing -.
Reading from stdin...
Cannot seek backward in linear streams!
Seek failed
Cannot seek backward in linear streams!
Seek failed
Cannot seek backward in linear streams!
Seek failed
Cannot seek backward in linear streams!
Seek failed
Cannot seek backward in linear streams!
Seek failed
Cannot seek backward in linear streams!
Seek failed
Cannot seek backward in linear streams!
Seek failed
Cannot seek backward in linear streams!
Seek failed
Cannot seek backward in linear streams!
Seek failed
Cannot seek backward in linear streams!
Seek failed
Cannot seek backward in linear streams!
Seek failed
Cannot seek backward in linear streams!
Seek failed
Cannot seek backward in linear streams!
Seek failed
Cannot seek backward in linear streams!
Seek failed
Cannot seek backward in linear streams!
Seek failed
Cannot seek backward in linear streams!
Seek failed
Cannot seek backward in linear streams!
Seek failed
Cannot seek backward in linear streams!
Seek failed
Audio only file format detected.
==========================================================================
Opening audio decoder: [mp3lib] MPEG layer-2, layer-3
AUDIO: 32000 Hz, 2 ch, s16le, 320.0 kbit/31.25% (ratio: 40000->128000)
Selected audio codec: [mp3] afm: mp3lib (mp3lib MPEG layer-2, layer-3)
==========================================================================
[AO OSS] audio_setup: Can't open audio device /dev/dsp: No such file
or directory
AO: [alsa] 32000Hz 2ch s16le (2 bytes per sample)




Anyone have any thoughts on how to force the "AUDIO:" to use a
specific sample rate for the input stream across stdin?

Thanks!

-James