FLV resolution is not read

[Carl Eugen Hoyos]

Files as produced by the command line in ticket #4132 can't be decoded since 5312c319be98c63b8e59695222a13068a0dbc7ab
Setting analyzeduration to 25M fixes the issue.

$ ffmpeg -i remux.flv
ffmpeg version N-67902-gd3512a0 Copyright (c) 2000-2014 the FFmpeg developers
  built on Nov 22 2014 23:12:58 with gcc 4.7 (SUSE Linux)
  configuration: --enable-gpl
  libavutil      54. 15.100 / 54. 15.100
  libavcodec     56. 13.100 / 56. 13.100
  libavformat    56. 15.100 / 56. 15.100
  libavdevice    56.  3.100 / 56.  3.100
  libavfilter     5.  2.103 /  5.  2.103
  libswscale      3.  1.101 /  3.  1.101
  libswresample   1.  1.100 /  1.  1.100
  libpostproc    53.  3.100 / 53.  3.100
[flv @ 0x31b6ba0] decoding for stream 0 failed
[flv @ 0x31b6ba0] Could not find codec parameters for stream 0 (Video: vp6f, yuv420p): unspecified size
Consider increasing the value for the 'analyzeduration' and 'probesize' options
remux.flv: could not find codec parameters
Input #0, flv, from 'remux.flv':
  Metadata:
    encoder         : Lavf56.4.101
  Duration: 00:01:00.00, start: 0.000000, bitrate: 96 kb/s
    Stream #0:0: Video: vp6f, yuv420p, 15 fps, 15 tbr, 1k tbn, 1k tbc
At least one output file must be specified

[Michael Niedermayer]

Fixed in 24fdf7334d2bb9aab0abdbc878b8ae51eb57c86b