我想从麦克风录制音频.我的操作系统是ubuntu.我尝试了以下操作并出现错误

$ffmpeg -f alsa -ac 2 -i hw:1,0 -itsoffset 00:00:00.5 -f video4linux2 -s 320x240 -r 25 /dev/video0 out.mpg

ffmpeg version 0.8.8-4:0.8.8-0ubuntu0.12.04.1, Copyright (c) 2000-2013 the Libav

developers

built on Oct 22 2013 12:31:55 with gcc 4.6.3

*** THIS PROGRAM IS DEPRECATED ***

This program is only provided for compatibility and will be removed in a future release.

Please use avconv instead.

ALSA lib conf.c:3314:(snd_config_hooks_call) Cannot open shared library

libasound_module_conf_pulse.so

ALSA lib pcm.c:2217:(snd_pcm_open_noupdate) Unknown PCM hw:1,0

[alsa @ 0xbda7a0] cannot open audio device hw:1,0 (No such file or directory)

hw:1,0: Input/output error

然后我尝试

$ffmpeg -f oss -i /dev/dsp audio.mp3

ffmpeg version 0.8.8-4:0.8.8-0ubuntu0.12.04.1, Copyright (c) 2000-2013 the Libav

developers

built on Oct 22 2013 12:31:55 with gcc 4.6.3

*** THIS PROGRAM IS DEPRECATED ***

This program is only provided for compatibility and will be removed in a future release.

Please use avconv instead.

[oss @ 0x1ba57a0] /dev/dsp: No such file or directory

/dev/dsp: Input/output error

我无法获得ffmpeg来找到我的麦克风.如何告诉ffmpeg从麦克风录音？

似乎由于this topic,可以忽略“已弃用”消息