php - FFMPEG 2 Channel AIF files = fail -

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i wonder if has solution aif files "2 channels", not compile in ffmpeg. if take same aif file , open in editor , recompile stereo (l r), works expected.

my ffmpeg command , console output:

$ ffmpeg -i input.aif -ar 44100 -ab 128k -acodec libmp3lame -ac 2 -y output.mp3 ffmpeg version 2.0.1 copyright (c) 2000-2013 ffmpeg developers   built on mar  2 2014 19:58:58 gcc 4.6 (ubuntu/linaro 4.6.3-1ubuntu5)   configuration: --enable-gpl --enable-version3 --enable-shared --enable-nonfree --enable-postproc --enable-libfaac --enable-libmp3lame --enable-libopencore-amrnb --enable-libopencore-amrwb --enable-libtheora --enable-libvorbis --enable-libvpx --enable-libx264 --enable-libxvid   libavutil      52. 38.100 / 52. 38.100   libavcodec     55. 18.102 / 55. 18.102   libavformat    55. 12.100 / 55. 12.100   libavdevice    55.  3.100 / 55.  3.100   libavfilter     3. 79.101 /  3. 79.101   libswscale      2.  3.100 /  2.  3.100   libswresample   0. 17.102 /  0. 17.102   libpostproc    52.  3.100 / 52.  3.100 [aiff @ 0x1d94940] id3v2.32 tag skipped, cannot handle version input.aif: input/output error


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