[FFmpeg-user] How to set sample format for the alsa demuxer?

[LANGLOIS Olivier PIS -EXT]

Hi,

I have found the answer:

I had to change -sample_fmt s32 in

ffmpeg -f alsa -sample_fmt s32 -i hw:1,1,0 -strict -2 -acodec aac -ar 48000 -b:a 64k out.aac

to -acodec pcm_s32le for

ffmpeg -f alsa -acodec pcm_s32le -i hw:1,1,0 -strict -2 -acodec aac -ar 48000 -b:a 64k out.aac



> -----Original Message-----
> From: ffmpeg-user-bounces at ffmpeg.org [mailto:ffmpeg-user-
> bounces at ffmpeg.org] On Behalf Of LANGLOIS Olivier PIS -EXT
> Sent: Tuesday, December 10, 2013 2:44 PM
> To: ffmpeg-user at ffmpeg.org
> Subject: [FFmpeg-user] How to set sample format for the alsa demuxer?
>
> I want to set the input sample format to s32 but I failed to change it from its
> S16_LE default format.
>
> Am I doing something wrong or did I have stumbled onto a small ffmpeg
> bug?
>
> lano1106 at hpmini ~/dev/packages/ffmpeg/repos/extra-i686/src/ffmpeg-
> 2.1.1/libavdevice :( $ ffmpeg -f alsa -sample_fmt s32 -i hw:1,1,0 -strict -2 -
> acodec aac -ar 48000 -b:a 64k out.aac
> ffmpeg version 2.1.1 Copyright (c) 2000-2013 the FFmpeg developers
>   built on Dec 10 2013 17:24:34 with gcc 4.8.2 (GCC)
>   configuration: --prefix=/usr --disable-debug --disable-static --enable-
> avresample --enable-dxva2 --enable-fontconfig --enable-gnutls --enable-gpl
> --enable-libass --enable-libbluray --enable-libfreetype --enable-libgsm --
> enable-libmodplug --enable-libmp3lame --enable-libopencore_amrnb --
> enable-libopencore_amrwb --enable-libopenjpeg --enable-libopus --enable-
> libpulse --enable-librtmp --enable-libschroedinger --enable-libspeex --
> enable-libtheora --enable-libv4l2 --enable-libvorbis --enable-libvpx --enable-
> libx264 --enable-libxvid --enable-pic --enable-postproc --enable-runtime-
> cpudetect --enable-shared --enable-swresample --enable-vdpau --enable-
> version3 --enable-x11grab
>   libavutil      52. 48.101 / 52. 48.101
>   libavcodec     55. 39.101 / 55. 39.101
>   libavformat    55. 19.104 / 55. 19.104
>   libavdevice    55.  5.100 / 55.  5.100
>   libavfilter     3. 90.100 /  3. 90.100
>   libavresample   1.  1.  0 /  1.  1.  0
>   libswscale      2.  5.101 /  2.  5.101
>   libswresample   0. 17.104 /  0. 17.104
>   libpostproc    52.  3.100 / 52.  3.100
> [alsa @ 0x8b2afa0] cannot set sample format 0x10000 2 (Invalid argument)
> hw:1,1,0: Input/output error
>


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