[FFmpeg-trac] #5049(undetermined:new): Strange bug when converting to .webm

[FFmpeg]

#5049: Strange bug when converting to .webm
-------------------------------------+-------------------------------------
             Reporter:               |                    Owner:
  Alexander2015                      |                   Status:  new
                 Type:  defect       |                Component:
             Priority:  normal       |  undetermined
              Version:  unspecified  |               Resolution:
             Keywords:               |               Blocked By:
             Blocking:               |  Reproduced by developer:  0
Analyzed by developer:  0            |
-------------------------------------+-------------------------------------

Comment (by Alexander2015):

 I make FFmpeg from GIT sources. Configure and Make no errors gives. Key
 -codecs show list, contain vp8, vp9 and opus. When I run ffmpeg -i
 outfile.avi -format webm outfileGIT.webm get message:

 {{{
 Stream mapping:
   Stream #0:0 -> #0:0 (h264 (native) -> ? (?))
   Stream #0:1 -> #0:1 (aac (native) -> vorbis (native))
 Encoder (codec vp8) not found for output stream #0:0
 }}}

 When I run ffmpeg -i outfile.avi -acodec opus -vcodec vp9 -format webm
 outfileGIT.webm :


 {{{
 Input #0, avi, from 'outfile.avi':
   Metadata:
     encoder         : Lavf56.40.101
   Duration: 00:02:26.04, start: 0.000000, bitrate: 1366 kb/s
     Stream #0:0: Video: h264 (Constrained Baseline) (avc1 / 0x31637661),
 yuv420p, 788x576 [SAR 2560:2561 DAR 160:117], 1257 kb/s, 50 fps, 25 tbr,
 50 tbn, 50 tbc
     Stream #0:1: Audio: aac (LC) ([255][0][0][0] / 0x00FF), 32000 Hz,
 stereo, fltp, 95 kb/s
 Unknown encoder 'vp9'
 }}}

 {{{
 ffmpeg version N-76960-g25e37f5 Copyright (c) 2000-2015 the FFmpeg
 developers
   built with gcc 5.2.1 (Debian 5.2.1-22) 20151010
   configuration:
   libavutil      55.  9.100 / 55.  9.100
   libavcodec     57. 16.101 / 57. 16.101
   libavformat    57. 19.100 / 57. 19.100
   libavdevice    57.  0.100 / 57.  0.100
   libavfilter     6. 17.100 /  6. 17.100
   libswscale      4.  0.100 /  4.  0.100
   libswresample   2.  0.101 /  2.  0.101
 }}}

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Ticket URL: <https://trac.ffmpeg.org/ticket/5049#comment:3>
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