【发布时间】：2018-01-21 10:41:56
【问题描述】：
使用基于 windows 的 ffmpeg 将 MP3 转换为 AMR。 由于某种原因，它失败并出现如下错误。
不知道如何为 AMR 提供正确的参数。
C:\Program Files (x86)\AMR to MP3 Converter>ffmpeg -i mfile.mp3 -ar 8000 -ab 12.2k audio.amr
FFmpeg version SVN-r26400, Copyright (c) 2000-2011 the FFmpeg developers
built on Jan 18 2011 04:07:05 with gcc 4.4.2
configuration: --enable-gpl --enable-version3 --enable-libgsm --enable-libvorb
is --enable-libtheora --enable-libspeex --enable-libmp3lame --enable-libopenjpeg
--enable-libschroedinger --enable-libopencore_amrwb --enable-libopencore_amrnb
--enable-libvpx --disable-decoder=libvpx --arch=x86 --enable-runtime-cpudetect -
-enable-libxvid --enable-libx264 --enable-librtmp --extra-libs='-lrtmp -lpolarss
l -lws2_32 -lwinmm' --target-os=mingw32 --enable-avisynth --enable-w32threads --
cross-prefix=i686-mingw32- --cc='ccache i686-mingw32-gcc' --enable-memalign-hack
libavutil 50.36. 0 / 50.36. 0
libavcore 0.16. 1 / 0.16. 1
libavcodec 52.108. 0 / 52.108. 0
libavformat 52.93. 0 / 52.93. 0
libavdevice 52. 2. 3 / 52. 2. 3
libavfilter 1.74. 0 / 1.74. 0
libswscale 0.12. 0 / 0.12. 0
[mp3 @ 003abeb0] max_analyze_duration reached
[mp3 @ 003abeb0] Estimating duration from bitrate, this may be inaccurate
Input #0, mp3, from 'mfile.mp3':
Metadata:
title : SPL_TRACK
artist : Krishnan
album : Lord
genre : Lord
track : 5
Duration: 00:30:06.00, start: 0.000000, bitrate: 127 kb/s
Stream #0.0: Audio: mp3, 44100 Hz, 2 channels, s16, 128 kb/s
[libopencore_amrnb @ 017e0d20] Only mono supported
Output #0, amr, to 'audio.amr':
Stream #0.0: Audio: libopencore_amrnb, 8000 Hz, 2 channels, s16, 12 kb/s
Stream mapping:
Stream #0.0 -> #0.0
Error while opening encoder for output stream #0.0 - maybe incorrect parameters
such as bit_rate, rate, width or height
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