ffmpeg -threads 4 -i short.mp4 -acodec libvorbis -ar 22050 -ss 0.04 -aspect 1.7777777777 -ac 2 -ab 64k -ar 44100 -b 1000k -threads 4 -s 1000x562 short_big.webm

ffmpeg version 0.8.3-4:0.8.3-0ubuntu0.12.04.1, Copyright (c) 2000-2012 the Libav developers
  built on Jun 12 2012 16:37:58 with gcc 4.6.3
*** THIS PROGRAM IS DEPRECATED ***
This program is only provided for compatibility and will be removed in a future release. Please use avconv instead.

Seems stream 0 codec frame rate differs from container frame rate: 59.94 (60000/1001) -> 1000.00 (1000/1)
Input #0, mov,mp4,m4a,3gp,3g2,mj2, from 'short.mp4':
  Metadata:
    major_brand     : isom
    minor_version   : 512
    compatible_brands: isomiso2avc1mp41
    creation_time   : 2011-10-03 20:05:00
    encoder         : Lavf53.21.0
  Duration: 00:01:00.02, start: 0.000000, bitrate: 3118 kb/s
    Stream #0.0(und): Video: h264 (High), yuv420p, 1280x720, 2962 kb/s, 29.97 fps, 1k tbr, 30k tbn, 59.94 tbc
    Metadata:
      creation_time   : 2011-10-03 20:05:00
    Stream #0.1(und): Audio: aac, 44100 Hz, stereo, s16, 148 kb/s
    Metadata:
      creation_time   : 2011-10-03 20:05:00
[buffer @ 0x925e480] w:1280 h:720 pixfmt:yuv420p
[scale @ 0x92695e0] w:1280 h:720 fmt:yuv420p -> w:1000 h:562 fmt:yuv420p flags:0x4
[libvpx @ 0x9269ae0] v1.0.0
[libvorbis @ 0x9257000] oggvorbis_encode_init: init_encoder failed
Output #0, webm, to 'short_big.webm':
    Stream #0.0(und): Video: libvpx, yuv420p, 1000x562 [PAR 1:1 DAR 500:281], q=-1--1, 1000 kb/s, 90k tbn, 1k tbc
    Metadata:
      creation_time   : 2011-10-03 20:05:00
    Stream #0.1(und): Audio: libvorbis, 44100 Hz, stereo, s16, 1000 kb/s
    Metadata:
      creation_time   : 2011-10-03 20:05:00
Stream mapping:
  Stream #0.0 -> #0.0
  Stream #0.1 -> #0.1
Error while opening encoder for output stream #0.1 - maybe incorrect parameters such as bit_rate, rate, width or height