FFmpeg將m3u轉(zhuǎn)為mp3，報(bào)錯(cuò)：Invalid data found when processing input

命令：

uiosun@uiosun-CW65S:~/Downloads$ ffmpeg -i test.m3u test.mp4

結(jié)果：

ffmpeg version 2.8.14-0ubuntu0.16.04.1 Copyright (c) 2000-2018 the FFmpeg developers
  built with gcc 5.4.0 (Ubuntu 5.4.0-6ubuntu1~16.04.9) 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
  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

test.m3u: Invalid data found when processing input

test.m3u 是我從A站拿到的視頻路徑，具體內(nèi)容如下：

#EXTM3U
http://player.acfun.cn/route_mp4?dt=0&uid=0&timestamp=1529889316&fid=030002010056D9063AF9692D9B7D2FCC7380FE-FFE8-AD01-3806-1B72868E9764.flv&ns=video.acfun.cn&ran=0&vid=585cfe740cf2e963ad610b98&customer_id=5859fdaee4b0eaf5dd325b91&sign=ct5b3042240cf22ea1f09bb7eb

新建一個(gè) .m3u 后綴的文件，并將這段復(fù)制進(jìn)去就可以播放。但為什么不能轉(zhuǎn)碼成 .mp3 呢？