No aspect ratio shown for realvideo

[Carl Eugen Hoyos]

(issue 1862, maybe a duplicate of ticket #1507)
I will attach a sample with incorrect aspect ratio, plays correctly with:
mplayer -demuxer real -vc rv3040
mplayer -demuxer real -vc ffrv40
mplayer -demuxer lavf -vc rv3040

Incorrect aspect ratio with FFmpeg and:
mplayer -demuxer lavf -vc ffrv40

$ ffmpeg -i join_cut.rmvb
ffmpeg version N-42594-g56ae592 Copyright (c) 2000-2012 the FFmpeg developers
  built on Jul 18 2012 09:14:59 with gcc 4.3.2
  configuration: --cc=/usr/local/gcc-4.3.2/bin/gcc --enable-gpl --enable-libopenjpeg --enable-libvorbis --enable-libspeex --enable-libmp3lame --enable-libtheora --extra-ldflags=-lm --enable-libvpx --enable-libxavs --enable-x11grab --enable-libass
  libavutil      51. 65.100 / 51. 65.100
  libavcodec     54. 41.100 / 54. 41.100
  libavformat    54. 17.100 / 54. 17.100
  libavdevice    54.  1.100 / 54.  1.100
  libavfilter     3.  2.100 /  3.  2.100
  libswscale      2.  1.100 /  2.  1.100
  libswresample   0. 15.100 /  0. 15.100
  libpostproc    52.  0.100 / 52.  0.100
Input #0, rm, from 'join_cut.rmvb':
  Metadata:
    title           : ���������N�vFA_01
    author          : ����
    copyright       : http://dotmu.5d6d.com
    comment         :
  Duration: 00:02:28.02, start: 0.000000, bitrate: 138 kb/s
    Stream #0:0: Audio: aac (raac / 0x63616172), 44100 Hz, stereo, s16, 128 kb/s
    Stream #0:1: Video: rv40 (RV40 / 0x30345652), yuv420p, 1024x576, 863 kb/s, 25 fps, 25 tbr, 1k tbn, 1k tbc
At least one output file must be specified

[Carl Eugen Hoyos]

The problem is not that ffmpeg incorrectly transcodes the sample (ffmpeg assumes sar=1 and correctly handles this sample), but that dar is not shown with ffmpeg -i join_cut.rmvb