ffmpeg MP4 转 Webm 遇到问题

ffmpeg MP4 转 Webm 遇到问题

当我尝试将 mp4 转换为 webm 时出现错误:

Encoder (codec vp8) not found for output stream #0:0

谷歌搜索告诉我,我需要安装 libvpx,但我已经安装了。

其余内容如下:

Logans-MacBook-Pro:desktop loganmccoy$ ffmpeg -i video.mp4 -acodec libvorbis -aq 5 -ac 2 -qmax 25 -threads 2 myvideo.webm
ffmpeg version 2.8 Copyright (c) 2000-2015 the FFmpeg developers
  built with Apple LLVM version 6.1.0 (clang-602.0.53) (based on LLVM 3.6.0svn)
  configuration: --prefix=/usr/local/Cellar/ffmpeg/2.8 --enable-shared --enable-pthreads --enable-gpl --enable-version3 --enable-hardcoded-tables --enable-avresample --cc=clang --host-cflags= --host-ldflags= --enable-opencl --enable-libx264 --enable-libmp3lame --enable-libvo-aacenc --enable-libxvid --enable-vda
  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
Input #0, mov,mp4,m4a,3gp,3g2,mj2, from 'video.mp4':
  Metadata:
    major_brand     : M4V 
    minor_version   : 1
    compatible_brands: M4V mp42isom
    creation_time   : 2015-09-21 06:30:12
  Duration: 00:00:10.58, start: 0.000000, bitrate: 1264 kb/s
    Stream #0:0(eng): Video: h264 (Main) (avc1 / 0x31637661), yuv420p(tv, bt709), 1280x720, 1253 kb/s, 29.97 fps, 29.97 tbr, 30k tbn, 59.94 tbc (default)
    Metadata:
      creation_time   : 2015-09-21 06:30:12
      handler_name    : Mainconcept MP4 Video Media Handler
      encoder         : AVC Coding
File 'myvideo.webm' already exists. Overwrite ? [y/N] y
Output #0, webm, to 'myvideo.webm':
  Metadata:
    major_brand     : M4V 
    minor_version   : 1
    compatible_brands: M4V mp42isom
    Stream #0:0(eng): Video: vp8, none, q=2-31, 128 kb/s (default)
    Metadata:
      creation_time   : 2015-09-21 06:30:12
      handler_name    : Mainconcept MP4 Video Media Handler
Stream mapping:
  Stream #0:0 -> #0:0 (h264 (native) -> ? (?))
Encoder (codec vp8) not found for output stream #0:0

有任何想法吗?

答案1

您可能已经安装了 libvpx,但是您的ffmpeg构建缺少--enable-libvpx(和--enable-libvorbis--enable-libopus),因此尚未配置为支持它。

你可以编译ffmpeg,但最简单的方法就是下载静态构建ffmpeg:它有 libvpx 支持。

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