ffprobe reports Unsupported video codec for Real Media format which do not have video at all

[richardpl]

Samples:  http://samples.mplayerhq.hu/real/AC-atrc/

ffprobe FUN_RM_132.rm
ffprobe version git-2011-11-20-50d6f81, Copyright (c) 2007-2011 the FFmpeg developers

built on Nov 20 2011 11:14:23 with clang 3.0 (branches/release_30 142614)
configuration: --disable-indev=alsa --disable-outdev=alsa --enable-postproc --enable-gpl --enable-shared --disable-static --disable-indev=bktr --disable-ffmpeg --enable-openssl --enable-nonfree --cc=clang --disable-debug
libavutil 51. 26. 0 / 51. 26. 0
libavcodec 53. 36. 0 / 53. 36. 0
libavformat 53. 21. 0 / 53. 21. 0
libavdevice 53. 4. 0 / 53. 4. 0
libavfilter 2. 49. 0 / 2. 49. 0
libswscale 2. 1. 0 / 2. 1. 0
libpostproc 51. 2. 0 / 51. 2. 0

[NULL @ 0x29838800] Unsupported video codec
Input #0, rm, from 'FUN_RM_132.rm':

Metadata:

title : Fun
author :
copyright : �2001
comment :

Duration: 00:00:16.71, start: 0.000000, bitrate: 134 kb/s

Stream #0:0: Audio: atrac3 (atrc / 0x63727461), 44100 Hz, 2 channels, s16, 132 kb/s
Stream #0:1: Data: none

Unsupported codec with id 0 for input stream 1

[cehoyos]

Attached patch silences the message, I don't know if the patch is correct, MPlayer checks the mimetype instead of the tag.

[cehoyos]

This issue is improved in latest git head, please reopen if you have a better suggestion to solve it.