ffmpeg - 错误 :Output file #0 does not contain any stream (ffmpeg)

Question

我正在尝试使用 FFmpeg 从 mp4 视频制作缩略图但我收到的错误是

Output #0, image2, to 'output.jpg':

Output file #0 does not contain any stream

我使用的命令是

ffmpeg -i file_example_MP4_700KB.mp4 -ss 00:00:01 -vf thumbnail,scale=200:115 -qscale:v 2 -frames:v 1 -f image2 -c:v mjpeg output.jpg

而且我不确定我做错了什么，我坚持扔了这么久。
任何建议都会很好
我正在使用 Ubuntu 18。*
完整日志:-

ffmpeg version n4.1.4 Copyright (c) 2000-2019 the FFmpeg developers
built with gcc 7 (Ubuntu 7.4.0-1ubuntu1~18.04.1)
 configuration: --prefix= --prefix=/usr --disable-debug --disable-doc --disable-static --enable-avisynth --enable-cuda --enable-cuvid --enable- libdrm --enable-ffplay --enable-gnutls --enable-gpl --enable-libass --enable-libfdk-aac --enable-libfontconfig --enable-libfreetype --enable-libmp3lame --enable-libopencore_amrnb --enable-libopencore_amrwb --enable-libopus --enable-libpulse --enable-sdl2 --enable-libspeex --enable-libtheora --enable-libtwolame --enable-libv4l2 --enable-libvorbis --enable-libvpx --enable-libx264 --enable-libx265 --enable-libxcb --enable-libxvid --enable-nonfree --enable-nvenc --enable-omx --enable-openal --enable-opencl --enable-runtime-cpudetect --enable-shared --enable-vaapi --enable-vdpau --enable-version3 --enable-xlib
libavutil      56. 22.100 / 56. 22.100
libavcodec     58. 35.100 / 58. 35.100
libavformat    58. 20.100 / 58. 20.100
libavdevice    58.  5.100 / 58.  5.100
libavfilter     7. 40.101 /  7. 40.101
libswscale      5.  3.100 /  5.  3.100
libswresample   3.  3.100 /  3.  3.100
libpostproc    55.  3.100 / 55.  3.100
Input #0, mp3, from 'file_example_MP3_700KB.mp3':
Metadata:
genre           : Cinematic
album           : YouTube Audio Library
title           : Impact Moderato
artist          : Kevin MacLeod
Duration: 00:00:27.25, start: 0.034531, bitrate: 224 kb/s
Stream #0:0: Audio: mp3, 32000 Hz, stereo, fltp, 224 kb/s
Metadata:
  encoder         : LAME3.99r
Output #0, image2, to 'output.jpg':
Output file #0 does not contain any stream

Answer 1

我遇到了同样的问题:ffmpeg -i myfile.raw -f s16le -ac 1 -ar 48000 -acodec pcm_s16le output.mp3解决方案是将顺序更改为:ffmpeg -f s16le -ac 1 -ar 48000 -acodec pcm_s16le -i input.raw output.mp3