arecord: recording in left-channel only
The problem:
I cannot enable recording in the right-channel using arecord. I recorded using arecord -f dat -d 20 -D hw:0,0 test.wav. Output in Left channel is fine. Output from right channel is 'Mic' (ie. I record my typing and the playback of the recording through the speaker. I have disabled Mic as a capture source so I do not know why this is happening.) I initially thought there was a physical problem with the turntable. But I get the same effect if I record from CD. Hardware configuration: -Turntable connected to amp (turntable plugged into 'phono' on amp) -LineOut of computer connected to TapeIn of amp -TapeOut of amp connected to LineIn of computer Sound card installed on computer (cat /proc/asound/cards): 0 [nForce2 ]: NFORCE - NVidia nForce2 NVidia nForce2 with ALC650F at 0xe9080000, irq 16 Sound modules loaded (cat /proc/modules|grep snd) snd_intel8x0 30620 3 - Live 0xf8c08000 snd_ac97_codec 95136 1 snd_intel8x0, Live 0xf9464000 snd_ac97_bus 2176 1 snd_ac97_codec, Live 0xf8bb3000 snd_pcm_oss 50848 0 - Live 0xf9493000 snd_mixer_oss 17920 2 snd_pcm_oss, Live 0xf90fc000 snd_pcm 84100 3 snd_intel8x0,snd_ac97_codec,snd_pcm_oss, Live 0xf947d000 snd_timer 22148 1 snd_pcm, Live 0xf8bf4000 snd 49124 10 snd_intel8x0,snd_ac97_codec,snd_pcm_oss,snd_mixer_oss,snd_pcm,snd_timer, Live 0xf910c000 soundcore 8160 2 snd, Live 0xf8bb5000 snd_page_alloc 8840 2 snd_intel8x0,snd_pcm, Live 0xf8bf0000 amixer settings: Simple mixer control 'Master',0 Capabilities: pvolume pswitch pswitch-joined Playback channels: Front Left - Front Right Limits: Playback 0 - 31 Mono: Front Left: Playback 28 [90%] [on] Front Right: Playback 28 [90%] [on] Simple mixer control 'Master Mono',0 Capabilities: pvolume pvolume-joined pswitch pswitch-joined Playback channels: Mono Limits: Playback 0 - 31 Mono: Playback 28 [90%] [off] Simple mixer control '3D Control - Center',0 Capabilities: volume volume-joined Playback channels: Mono Capture channels: Mono Limits: 0 - 15 Mono: 13 [87%] Simple mixer control '3D Control - Depth',0 Capabilities: volume volume-joined Playback channels: Mono Capture channels: Mono Limits: 0 - 15 Mono: 13 [87%] Simple mixer control '3D Control - Switch',0 Capabilities: pswitch pswitch-joined Playback channels: Mono Mono: Playback [off] Simple mixer control 'PCM',0 Capabilities: pvolume pswitch pswitch-joined Playback channels: Front Left - Front Right Limits: Playback 0 - 31 Mono: Front Left: Playback 25 [81%] [on] Front Right: Playback 25 [81%] [on] Simple mixer control 'Surround',0 Capabilities: pvolume pswitch Playback channels: Front Left - Front Right Limits: Playback 0 - 31 Mono: Front Left: Playback 26 [84%] [off] Front Right: Playback 26 [84%] [off] Simple mixer control 'Surround Down Mix',0 Capabilities: pswitch pswitch-joined Playback channels: Mono Mono: Playback [off] Simple mixer control 'Surround Jack Mode',0 Capabilities: enum Items: 'Shared' 'Independent' Item0: 'Independent' Simple mixer control 'Center',0 Capabilities: pvolume pvolume-joined pswitch pswitch-joined Playback channels: Mono Limits: Playback 0 - 31 Mono: Playback 26 [84%] [off] Simple mixer control 'Center/LFE Down Mix',0 Capabilities: pswitch pswitch-joined Playback channels: Mono Mono: Playback [off] Simple mixer control 'LFE',0 Capabilities: pvolume pvolume-joined pswitch pswitch-joined Playback channels: Mono Limits: Playback 0 - 31 Mono: Playback 26 [84%] [on] Simple mixer control 'Line',0 Capabilities: pvolume pswitch pswitch-joined cswitch cswitch-joined cswitch-exclusive Capture exclusive group: 0 Playback channels: Front Left - Front Right Capture channels: Front Left - Front Right Limits: Playback 0 - 31 Front Left: Playback 26 [84%] [on] Capture [on] Front Right: Playback 26 [84%] [on] Capture [on] Simple mixer control 'CD',0 Capabilities: pvolume pswitch pswitch-joined cswitch cswitch-joined cswitch-exclusive Capture exclusive group: 0 Playback channels: Front Left - Front Right Capture channels: Front Left - Front Right Limits: Playback 0 - 31 Front Left: Playback 26 [84%] [off] Capture [off] Front Right: Playback 26 [84%] [off] Capture [off] Simple mixer control 'Mic',0 Capabilities: pvolume pvolume-joined pswitch pswitch-joined cswitch cswitch-joined cswitch-exclusive Capture exclusive group: 0 Playback channels: Mono Capture channels: Front Left - Front Right Limits: Playback 0 - 31 Mono: Playback 26 [84%] [off] Front Left: Capture [off] Front Right: Capture [off] Simple mixer control 'Mic Boost (+20dB)',0 Capabilities: pswitch pswitch-joined Playback channels: Mono Mono: Playback [off] Simple mixer control 'Mic Select',0 Capabilities: enum Items: 'Mic1' 'Mic2' Item0: 'Mic2' Simple mixer control 'Video',0 Capabilities: pvolume pswitch pswitch-joined cswitch cswitch-joined cswitch-exclusive Capture exclusive group: 0 Playback channels: Front Left - Front Right Capture channels: Front Left - Front Right Limits: Playback 0 - 31 Front Left: Playback 27 [87%] [off] Capture [off] Front Right: Playback 27 [87%] [off] Capture [off] Simple mixer control 'Phone',0 Capabilities: pvolume pvolume-joined pswitch pswitch-joined cswitch cswitch-joined cswitch-exclusive Capture exclusive group: 0 Playback channels: Mono Capture channels: Front Left - Front Right Limits: Playback 0 - 31 Mono: Playback 27 [87%] [off] Front Left: Capture [off] Front Right: Capture [off] Simple mixer control 'IEC958',0 Capabilities: pswitch pswitch-joined cswitch cswitch-joined Playback channels: Mono Capture channels: Mono Mono: Playback [off] Capture [off] Simple mixer control 'IEC958 Playback AC97-SPSA',0 Capabilities: volume volume-joined Playback channels: Mono Capture channels: Mono Limits: 0 - 3 Mono: 0 [0%] Simple mixer control 'PC Speaker',0 Capabilities: pvolume pvolume-joined pswitch pswitch-joined Playback channels: Mono Limits: Playback 0 - 15 Mono: Playback 0 [0%] [off] Simple mixer control 'Aux',0 Capabilities: pvolume pswitch pswitch-joined cswitch cswitch-joined cswitch-exclusive Capture exclusive group: 0 Playback channels: Front Left - Front Right Capture channels: Front Left - Front Right Limits: Playback 0 - 31 Front Left: Playback 31 [100%] [off] Capture [off] Front Right: Playback 31 [100%] [off] Capture [off] Simple mixer control 'Mono Output Select',0 Capabilities: enum Items: 'Mix' 'Mic' Item0: 'Mix' Simple mixer control 'Capture',0 Capabilities: cvolume cswitch cswitch-joined Capture channels: Front Left - Front Right Limits: Capture 0 - 15 Front Left: Capture 14 [93%] [on] Front Right: Capture 14 [93%] [on] Simple mixer control 'Mix',0 Capabilities: cswitch cswitch-joined cswitch-exclusive Capture exclusive group: 0 Capture channels: Front Left - Front Right Front Left: Capture [off] Front Right: Capture [off] Simple mixer control 'Mix Mono',0 Capabilities: cswitch cswitch-joined cswitch-exclusive Capture exclusive group: 0 Capture channels: Front Left - Front Right Front Left: Capture [off] Front Right: Capture [off] Simple mixer control 'Analog to IEC958 Output',0 Capabilities: pswitch pswitch-joined Playback channels: Mono Mono: Playback [off] Simple mixer control 'Channel Mode',0 Capabilities: enum Items: '2ch' '4ch' '6ch' Item0: '2ch' Simple mixer control 'Duplicate Front',0 Capabilities: pswitch pswitch-joined Playback channels: Mono Mono: Playback [off] Simple mixer control 'Exchange Center/LFE',0 Capabilities: pswitch pswitch-joined Playback channels: Mono Mono: Playback [off] Simple mixer control 'External Amplifier',0 Capabilities: pswitch pswitch-joined Playback channels: Mono Mono: Playback [off] Simple mixer control 'Swap Surround Slot',0 Capabilities: pswitch pswitch-joined Playback channels: Mono Mono: Playback [off] Any help appreciated. I'm stumped. --Charlie |
not meaning to state the obvious but make sure mic is not pluged into right line in.
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Quote:
Regards, --Charlie |
I have just found that selecting 'Mic' as the capture source produces a correct recording (ie. both left and right channels are recorded ok). So the source of the problem appears to be some difference between 'LineIn' and 'CD' as the capture source and 'Mic as the capture source.
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