FFMpeg: GIF를 MP4로 변환하면 코드 오류가 발생합니다.

GIF를 MP4로 변환하려고 합니다. 특정 매개변수로 이 작업을 수행할 때 오류가 발생합니다. 내가 뭘 잘못했나요? 도움이 되셨다면 기쁘겠습니다. 나는 고품질의 mp4 비디오를 원합니다. 크기는 문제가 되지 않습니다.

명령 및 로그:

ffmpeg -i So_gehts.gif -c:v libvpx -crf 4 -b:v 500K output.mp4
ffmpeg version 2.7.6-0ubuntu0.15.10.1 Copyright (c) 2000-2016 the FFmpeg developers
  built with gcc 5.2.1 (Ubuntu 5.2.1-22ubuntu2) 20151010
  configuration: --prefix=/usr --extra-version=0ubuntu0.15.10.1 --build-suffix=-ffmpeg --toolchain=hardened --libdir=/usr/lib/x86_64-linux-gnu --incdir=/usr/include/x86_64-linux-gnu --enable-gpl --enable-shared --disable-stripping --enable-avresample --enable-avisynth --enable-frei0r --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-openal --enable-libopus --enable-libpulse --enable-librtmp --enable-libschroedinger --enable-libshine --enable-libspeex --enable-libtheora --enable-libtwolame --enable-libvorbis --enable-libvpx --enable-libwavpack --enable-libwebp --enable-libxvid --enable-libzvbi --enable-opengl --enable-x11grab --enable-libdc1394 --enable-libiec61883 --enable-libzmq --enable-libssh --enable-libsoxr --enable-libx264 --enable-libopencv --enable-libx265
  libavutil      54. 27.100 / 54. 27.100
  libavcodec     56. 41.100 / 56. 41.100
  libavformat    56. 36.100 / 56. 36.100
  libavdevice    56.  4.100 / 56.  4.100
  libavfilter     5. 16.101 /  5. 16.101
  libavresample   2.  1.  0 /  2.  1.  0
  libswscale      3.  1.101 /  3.  1.101
  libswresample   1.  2.100 /  1.  2.100
  libpostproc    53.  3.100 / 53.  3.100
Input #0, gif, from 'So_gehts.gif':
  Duration: N/A, bitrate: N/A
    Stream #0:0: Video: gif, bgra, 374x461, 29.25 fps, 100 tbr, 100 tbn, 100 tbc
File 'output.mp4' already exists. Overwrite ? [y/N] y
[libvpx @ 0x16a5940] v1.4.0
[mp4 @ 0x168ec60] Could not find tag for codec vp8 in stream #0, codec not currently supported in container
Output #0, mp4, to 'output.mp4':
  Metadata:
    encoder         : Lavf56.36.100
    Stream #0:0: Video: vp8 (libvpx), yuva420p, 374x461, q=-1--1, 500 kb/s, 100 fps, 100 tbn, 100 tbc
    Metadata:
      encoder         : Lavc56.41.100 libvpx
Stream mapping:
  Stream #0:0 -> #0:0 (gif (native) -> vp8 (libvpx))
Could not write header for output file #0 (incorrect codec parameters ?): Invalid argument

도움이 되셨다면 기쁘겠습니다. 감사해요.