[solved] alsa audio output error: unknown 10 channels config

[e3k]

i run vlc 2.0 on gentoo linux kernel 3.2.1
my soundcard: Multimedia audio controller: VIA Technologies Inc. ICE1712 [Envy24] PCI Multi-Channel I/O Controller (rev 02)

sound is working fine with other players but when i play a video with vlc i get no sound for video or mp3.

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[0xab3818] alsa audio output error: unknown 10 channels configuration [0xab3818] main audio output error: no suitable audio output module [0xa082c8] main decoder error: failed to create audio output

[Jean-Baptiste Kempf]

You have 10channels on your audio output?

[e3k]

the card looks like this: http://www.m-audio.com/products/en_us/A ... e2496.html

it has 2 in to out and a midi interface. previously i had no problems with vlc. maybe i should downgrade to 1 and try again.

[e3k]

yes with vlc-1.1.13 i get a sound and no error. any ideas?

[Rémi Denis-Courmont]

You removed all the interesting debug messages...

[e3k]

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[0x618688] main playlist debug: creating audio output [0x9bab98] main audio output debug: looking for audio output module: 1 candidate [0x9bab98] alsa audio output debug: using ALSA device: default:CARD=M2496 [0x9bab98] alsa audio output debug: Plug PCM: Direct Stream Mixing PCM Hardware PCM card 0 'M Audio Audiophile 24/96' device 0 subdevice 0 Its setup is: stream : PLAYBACK access : MMAP_INTERLEAVED format : S32_LE subformat : STD channels : 10 rate : 48000 exact rate : 48000 (48000/1) msbits : 24 buffer_size : 6553 period_size : 1024 period_time : 21333 tstamp_mode : ENABLE period_step : 1 avail_min : 1024 period_event : 0 start_threshold : 1 stop_threshold : 0 silence_threshold: 0 silence_size : 0 boundary : 7378022089539715072 appl_ptr : 0 hw_ptr : 319965184 [0x9bab98] alsa audio output debug: device name : ICE1712 multi [0x9bab98] alsa audio output debug: device ID : ICE1712 multi [0x9bab98] alsa audio output debug: subdevice name: subdevice #0 [0x9bab98] alsa audio output debug: initial hardware setup: ACCESS: MMAP_INTERLEAVED MMAP_NONINTERLEAVED MMAP_COMPLEX RW_INTERLEAVED RW_NONINTERLEAVED FORMAT: S8 U8 S16_LE S16_BE U16_LE U16_BE S24_LE S24_BE U24_LE U24_BE S32_LE S32_BE U32_LE U32_BE FLOAT_LE FLOAT_BE FLOAT64_LE FLOAT64_BE MU_LAW A_LAW IMA_ADPCM S24_3LE S24_3BE U24_3LE U24_3BE S20_3LE S20_3BE U20_3LE U20_3BE S18_3LE S18_3BE U18_3LE U18_3BE SUBFORMAT: STD SAMPLE_BITS: [4 64] FRAME_BITS: [40 640] CHANNELS: 10 RATE: 48000 PERIOD_TIME: (21333 21334) PERIOD_SIZE: 1024 PERIOD_BYTES: [5120 81920] PERIODS: [2 6] BUFFER_TIME: (42666 128000] BUFFER_SIZE: [2048 6144] BUFFER_BYTES: [10240 491520] TICK_TIME: ALL [0x9bab98] alsa audio output debug: remixing from 2 to 10 channels [0x9bab98] alsa audio output debug: resampling from 44100 Hz to 48000 Hz [0x9bab98] alsa audio output debug: final HW setup: ACCESS: RW_INTERLEAVED FORMAT: FLOAT_LE SUBFORMAT: STD SAMPLE_BITS: 32 FRAME_BITS: 320 CHANNELS: 10 RATE: 48000 PERIOD_TIME: (21333 21334) PERIOD_SIZE: 1024 PERIOD_BYTES: 40960 PERIODS: 6 BUFFER_TIME: 128000 BUFFER_SIZE: 6144 BUFFER_BYTES: 245760 TICK_TIME: 0 [0x9bab98] alsa audio output debug: initial software parameters: tstamp_mode: NONE period_step: 1 avail_min: 1024 start_threshold: 1 stop_threshold: 6144 silence_threshold: 0 silence_size: 0 boundary: 6917529027641081856 [0x9bab98] alsa audio output debug: final software parameters: tstamp_mode: NONE period_step: 1 avail_min: 1024 start_threshold: 1 stop_threshold: 6144 silence_threshold: 0 silence_size: 0 boundary: 6917529027641081856 [0x9bab98] alsa audio output error: unknown 10 channels configuration [0x9bab98] main audio output debug: no audio output module matching "alsa" could be loaded [0x9bab98] main audio output debug: TIMER module_need() : 7.574 ms - Total 7.574 ms / 1 intvls (Avg 7.574 ms) [0x9bab98] main audio output error: no suitable audio output module [0x618688] main playlist debug: releasing audio output [0x15bc6a8] main decoder error: failed to create audio output

[Rémi Denis-Courmont]

The card you have selected requires 10 channels exactly. VLC does not know what is the map for 10 channels, so it is unable to remix and it fails.

You should select an ALSA device that accepts stereo.

[e3k]

the card accepts stereo. all the other players work fine. even vlc pre version 2 worked fine. i think its due to changes in alsa code of vlc in version 2.

[Rémi Denis-Courmont]

the card accepts stereo. all the other players work fine. even vlc pre version 2 worked fine. i think its due to changes in alsa code of vlc in version 2.

No, it does not; see "channels: 10" if your logs.

Most probably other apps enable automatic channels conversions, which really means padding with zeroes on the 8 extra channels. VLC could do that too; that usually works fine when the input has fewer channels than the output. But it sucks big time when the input has more channels than the output. And I'm afraid we have more users willing to play 5.1 sources on stereo speakers than users willing to play stereo sources on cards supporting 10 speakers like yours.

So until a smarter solution is found, you better fix your ALSA devices configuration to provide only two channels (if you have only two wired speakers).

[Rémi Denis-Courmont]

This is fixed in VLC 2.0.1.

[e3k]

happy to hear that

[e3k]

this issue is solved after update of alsa-lib and alsa-utils to version 1.0.25-r1 on gentoo.

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[0x9b03f8] main audio output debug: looking for audio output module: 1 candidate [0x9b03f8] alsa audio output debug: using ALSA device: front:CARD=M2496,DEV=0 [0x9b03f8] alsa audio output debug: Route conversion PCM Transformation table: 0 <- 0 1 <- 1 Slave: Hardware PCM card 0 'M Audio Audiophile 24/96' device 0 subdevice 0 [0x9b03f8] alsa audio output debug: device name : ICE1712 multi [0x9b03f8] alsa audio output debug: device ID : ICE1712 multi [0x9b03f8] alsa audio output debug: subdevice name: subdevice #0 [0x9b03f8] alsa audio output debug: initial hardware setup: ACCESS: MMAP_INTERLEAVED MMAP_NONINTERLEAVED RW_INTERLEAVED RW_NONINTERLEAVED FORMAT: S32_LE SUBFORMAT: STD SAMPLE_BITS: 32 FRAME_BITS: [32 4294967264] CHANNELS: [1 134217727] RATE: [8000 96000] PERIOD_TIME: (20 409500] PERIOD_SIZE: [2 3276] PERIOD_BYTES: [8 4294967295] PERIODS: [1 1024] BUFFER_TIME: (20 819125] BUFFER_SIZE: [2 6553] BUFFER_BYTES: [8 4294967295] TICK_TIME: ALL [0x9b03f8] alsa audio output debug: final HW setup: ACCESS: RW_INTERLEAVED FORMAT: S32_LE SUBFORMAT: STD SAMPLE_BITS: 32 FRAME_BITS: 64 CHANNELS: 2 RATE: 44100 PERIOD_TIME: (49546 49547) PERIOD_SIZE: 2185 PERIOD_BYTES: 17480 PERIODS: (2 3) BUFFER_TIME: (148594 148595) BUFFER_SIZE: 6553 BUFFER_BYTES: 52424 TICK_TIME: 0 [0x9b03f8] alsa audio output debug: initial software parameters: tstamp_mode: NONE period_step: 1 avail_min: 2185 start_threshold: 1 stop_threshold: 6553 silence_threshold: 0 silence_size: 0 boundary: 7378022089539715072 [0x9b03f8] alsa audio output debug: final software parameters: tstamp_mode: NONE period_step: 1 avail_min: 2185 start_threshold: 1 stop_threshold: 6553 silence_threshold: 0 silence_size: 0 boundary: 7378022089539715072 [0x9b03f8] alsa audio output debug: Available ALSA PCM devices: [0x9b03f8] alsa audio output debug: Discard all samples (playback) or generate zero samples (capture) (null) [0x9b03f8] alsa audio output debug: PulseAudio Sound Server (pulse) [0x9b03f8] alsa audio output debug: M Audio Audiophile 24/96, ICE1712 multi Default Audio Device (sysdefault:CARD=M2496) [0x9b03f8] alsa audio output debug: M Audio Audiophile 24/96, ICE1712 multi Front speakers (front:CARD=M2496,DEV=0) [0x9b03f8] alsa audio output debug: M Audio Audiophile 24/96, ICE1712 multi 4.0 Surround output to Front and Rear speakers (surround40:CARD=M2496,DEV=0) [0x9b03f8] alsa audio output debug: M Audio Audiophile 24/96, ICE1712 multi 4.1 Surround output to Front, Rear and Subwoofer speakers (surround41:CARD=M2496,DEV=0) [0x9b03f8] alsa audio output debug: M Audio Audiophile 24/96, ICE1712 multi 5.0 Surround output to Front, Center and Rear speakers (surround50:CARD=M2496,DEV=0) [0x9b03f8] alsa audio output debug: M Audio Audiophile 24/96, ICE1712 multi 5.1 Surround output to Front, Center, Rear and Subwoofer speakers (surround51:CARD=M2496,DEV=0) [0x9b03f8] alsa audio output debug: M Audio Audiophile 24/96, ICE1712 multi IEC958 (S/PDIF) Digital Audio Output (iec958:CARD=M2496,DEV=0) [0x9b03f8] main audio output debug: using audio output module "alsa"

[Vaselinessa]

I've likewise had this problem with vlc 2.0.0, but not earlier versions. I'm on Linux Mint 3.0.

[e3k]

I've likewise had this problem with vlc 2.0.0, but not earlier versions. I'm on Linux Mint 3.0.

well then upgrade... or does it work now?