[FFmpeg-user] Problems with concat

[James Board]

I'm trying to concatenate to AVI files together.  This is the command and error message

> ffmpeg -f concat -i file1.avi file2.avi -c copy OUT.avi
ffmpeg version N-54733-gab5f581 Copyright (c) 2000-2013 the FFmpeg developers
  built on Aug  5 2013 20:24:36 with gcc 4.4.7 (GCC) 20120313 (Red Hat 4.4.7-3)
  configuration: --enable-libfreetype --enable-gpl --enable-libx264
  libavutil      52. 39.100 / 52. 39.100
  libavcodec     55. 18.102 / 55. 18.102
  libavformat    55. 12.102 / 55. 12.102
  libavdevice    55.  3.100 / 55.  3.100
  libavfilter     3. 80.101 /  3. 80.101
  libswscale      2.  3.100 /  2.  3.100
  libswresample   0. 17.102 /  0. 17.102
  libpostproc    52.  3.100 / 52.  3.100
[concat @ 0x23aa060] Line 1: unknown keyword 'RIFF


Here's what ffprobe says about file1.avi

> ffprobe version N-54733-gab5f581 Copyright (c) 2007-2013 the FFmpeg developers
  built on Aug  5 2013 20:24:36 with gcc 4.4.7 (GCC) 20120313 (Red Hat 4.4.7-3)
  configuration: --enable-libfreetype --enable-gpl --enable-libx264
  libavutil      52. 39.100 / 52. 39.100
  libavcodec     55. 18.102 / 55. 18.102
  libavformat    55. 12.102 / 55. 12.102
  libavdevice    55.  3.100 / 55.  3.100
  libavfilter     3. 80.101 /  3. 80.101
  libswscale      2.  3.100 /  2.  3.100
  libswresample   0. 17.102 /  0. 17.102
  libpostproc    52.  3.100 / 52.  3.100
Input #0, avi, from '2014_Olympics_FS_yadif_ffvhuff000_encode.avi':
  Metadata:
    encoder         : MEncoder VERSION
  Duration: 00:00:08.01, start: 0.000000, bitrate: 9843 kb/s
Stream #0:0: Video: mpeg4 (Simple Profile) (FMP4 / 0x34504D46), yuv420p, 1920x1080 [SAR 1:1 DAR 16:9], 29.97 fps, 29.97 tbr, 29.97 tbn, 30k tbc


Both file1.avi and file2.avi can be played with ffplay or mplayer.