[FFmpeg-user] unknown decoder libvpx

[Christian Ebert]

* Leo Izen on Wednesday, January 22, 2014 at 01:48:57 -0500
> On 01/22/2014 12:53 AM, Jun Jie Pang wrote:
>> However, when i run ffmpeg,
>> $ffmpeg -f x11grab -r 25 -s 1280x720 -i :2.0 -vcodec libvpx out.webm
>> I encountered with an error of "Unknown encoder 'libvpx' "
>> Anyone happens to know what went wrong ?
> 
> libvpx now comes with vp8 AND vp9 support. You need to do
> -vcodec libvpx_vp8
> OR
> -vcodec libvpx_vp9
> depending on whether you want vp8 or vp9 as your video codec.

Are you sure?

ffmpeg -codecs | fgrep vpx
ffmpeg version N-60087-g94a5241 Copyright (c) 2000-2014 the FFmpeg developers
  built on Jan 22 2014 12:20:48 with Apple LLVM version 5.0 (clang-500.2.79) (based on LLVM 3.3svn)
  configuration: --enable-gpl --enable-version3 --enable-nonfree --disable-network --disable-ffserver --enable-shared --enable-libfdk-aac --enable-libx264 --enable-libxvid --enable-libfaac --enable-libmp3lame --enable-libtheora --enable-libvorbis --enable-libvpx --enable-librtmp --extra-cflags=-I/sw/include --extra-libs=-L/sw/lib
  libavutil      52. 63.100 / 52. 63.100
  libavcodec     55. 48.102 / 55. 48.102
  libavformat    55. 25.101 / 55. 25.101
  libavdevice    55.  5.102 / 55.  5.102
  libavfilter     4.  1.100 /  4.  1.100
  libswscale      2.  5.101 /  2.  5.101
  libswresample   0. 17.104 /  0. 17.104
  libpostproc    52.  3.100 / 52.  3.100
 DEV.L. vp8                  On2 VP8 (decoders: vp8 libvpx ) (encoders: libvpx )
 DEV.L. vp9                  Google VP9 (decoders: vp9 libvpx-vp9 ) (encoders: libvpx-vp9 )

Looks like libvpx is kept for backwards compatibility and vp9 is
called libvpx-vp9.

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