Code:
$ ffmpeg -i 01.mkv -vf scale=0.5 -vcodec -libvpx -vb 1024k -acodec libvorbis -aq 3 -ac 1 01.webm
ffmpeg version 0.8.4-6:0.8.4-0ubuntu0.12.10.1, Copyright (c) 2000-2012 the Libav developers
built on Nov 6 2012 16:51:11 with gcc 4.7.2
*** THIS PROGRAM IS DEPRECATED ***
This program is only provided for compatibility and will be removed in a future release. Please use avconv instead.
[matroska,webm @ 0x1761ba0] Estimating duration from bitrate, this may be inaccurate
Input #0, matroska,webm, from '01.mkv':
Duration: 00:08:51.80, start: 0.000000, bitrate: N/A
Stream #0.0: Video: mpeg4 (Simple Profile), yuv420p, 1920x1200 [PAR 1:1 DAR 8:5], 20 fps, 20 tbr, 1k tbn, 20 tbc (default)
Stream #0.1: Audio: vorbis, 48000 Hz, stereo, s16 (default)
Unknown encoder '-libvpx'
$
$
$
$ avconv -i 01.mkv -vf scale=0.5 -vcodec -libvpx -vb 1024k -acodec libvorbis -aq 3 -ac 1 01.webm
avconv version 0.8.4-6:0.8.4-0ubuntu0.12.10.1, Copyright (c) 2000-2012 the Libav developers
built on Nov 6 2012 16:51:11 with gcc 4.7.2
[matroska,webm @ 0xd3cb80] Estimating duration from bitrate, this may be inaccurate
Input #0, matroska,webm, from '01.mkv':
Duration: 00:08:51.80, start: 0.000000, bitrate: N/A
Stream #0.0: Video: mpeg4 (Simple Profile), yuv420p, 1920x1200 [PAR 1:1 DAR 8:5], 20 fps, 20 tbr, 1k tbn, 20 tbc (default)
Stream #0.1: Audio: vorbis, 48000 Hz, stereo, s16 (default)
Unknown encoder '-libvpx'
$
$
$
$ ffmpeg -codecs
...
D V D vp8 On2 VP8
...
$
$
$
$ avconv -codecs
...
D V D vp8 On2 VP8
...
and i installed the gstreamer [good, bad, ugly, ffmpeg] as well as a lot of other multimedia plugins, including the extras-53 plugins. was not having this problem in 12.04 [o_O]
TIA
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