我想将amr转换为mp3。我正在追问这个问题：
并输入：
ffmpeg -i example.amr -ar 22050 example.mp3
但输出包含错误：
ffmpeg version 2.8.11-0ubuntu0.16.04.1 Copyright (c) 2000-2017 the FFmpeg developers
built with gcc 5.4.0 (Ubuntu 5.4.0-6ubuntu1~16.04.4) 20160609
configuration: --prefix=/usr --extra-version=0ubuntu0.16.04.1 --build-suffix=-ffmpeg --toolchain=hardened --libdir=/usr/lib/x86_64-linux-gnu --incdir=/usr/include/x86_64-linux-gnu --cc=cc --cxx=g++ --enable-gpl --enable-shared --disable-stripping --disable-decoder=libopenjpeg --disable-decoder=libschroedinger --enable-avresample --enable-avisynth --enable-gnutls --enable-ladspa --enable-libass --enable-libbluray --enable-libbs2b --enable-libcaca --enable-libcdio --enable-libflite --enable-libfontconfig --enable-libfreetype --enable-libfribidi --enable-libgme --enable-libgsm --enable-libmodplug --enable-libmp3lame --enable-libopenjpeg --enable-libopus --enable-libpulse --enable-librtmp --enable-libschroedinger --enable-libshine --enable-libsnappy --enable-libsoxr --enable-libspeex --enable-libssh --enable-libtheora --enable-libtwolame --enable-libvorbis --enable-libvpx --enable-libwavpack --enable-libwebp --enable-libx265 --enable-libxvid --enable-libzvbi --enable-openal --enable-opengl --enable-x11grab --enable-libdc1394 --enable-libiec61883 --enable-libzmq --enable-frei0r --enable-libx264 --enable-libopencv
libavutil 54. 31.100 / 54. 31.100
libavcodec 56. 60.100 / 56. 60.100
libavformat 56. 40.101 / 56. 40.101
libavdevice 56. 4.100 / 56. 4.100
libavfilter 5. 40.101 / 5. 40.101
libavresample 2. 1. 0 / 2. 1. 0
libswscale 3. 1.101 / 3. 1.101
libswresample 1. 2.101 / 1. 2.101
libpostproc 53. 3.100 / 53. 3.100
[amr @ 0x2034540] Estimating duration from bitrate, this may be inaccurate
Input #0, amr, from 'example.amr':
Duration: 00:00:35.30, bitrate: 12 kb/s
Stream #0:0: Audio: amr_nb (samr / 0x726D6173), 8000 Hz, mono, flt, 12 kb/s
Output #0, mp3, to 'example.mp3':
Metadata:
TSSE : Lavf56.40.101
Stream #0:0: Audio: mp3 (libmp3lame), 22050 Hz, mono, fltp
Metadata:
encoder : Lavc56.60.100 libmp3lame
Stream mapping:
Stream #0:0 -> #0:0 (amr_nb (amrnb) -> mp3 (libmp3lame))
Press [q] to stop, [?] for help
example.amr: Input/output error
size= 138kB time=00:00:35.31 bitrate= 32.1kbits/s
video:0kB audio:138kB subtitle:0kB other streams:0kB global headers:0kB muxing overhead: 0.160448%
如何解决这个问题？
ffmpeg 要在Ubuntu 16上更新ffmpeg，请使用以下命令：
sudo add-apt-repository ppa:jonathonf/ffmpeg-3
sudo apt update && sudo apt upgrade
来源
http://ubuntuhandbook.org/index.php/2017/05/install-ffmpeg-3-3-in-ubuntu-16-04-14-04/