[FFmpeg-user] Understanding multiple aspect ratios

[Massimo Battistel]

Hello,
I have some files that show multiple aspect ratios if probed with ffprobe.
I would like to know how to interpret these results.

The following example gives me 4:3 and 295:216. While I'm expecting 4:3 is
the correct one, it looks that scale filter is using the second value
(295:216).

ffprobe itv.mov

ffprobe version N-62058-gfd2bcfc Copyright (c) 2007-2014 the FFmpeg
developers
  built on Apr  2 2014 22:09:31 with gcc 4.8.2 (GCC)
  configuration: --enable-gpl --enable-version3 --disable-w32threads
--enable-avisynth --enable-bzlib --enable-fontconfig --enable-frei0r
--enable-gnutls --enable-iconv --enable-libass --enable-libbluray
--enable-libcaca --enable-libfreetype --enable-libgsm --enable-libilbc
--enable-libmodplug --enable-libmp3lame --enable-libopencore-amrnb
--enable-libopencore-amrwb --enable-libopenjpeg --enable-libopus
--enable-librtmp --enable-libschroedinger --enable-libsoxr
--enable-libspeex --enable-libtheora --enable-libtwolame
--enable-libvidstab --enable-libvo-aacenc --enable-libvo-amrwbenc
--enable-libvorbis --enable-libvpx --enable-libwavpack --enable-libx264
--enable-libx265 --enable-libxavs --enable-libxvid --enable-zlib
  libavutil      52. 71.100 / 52. 71.100
  libavcodec     55. 56.107 / 55. 56.107
  libavformat    55. 36.101 / 55. 36.101
  libavdevice    55. 11.100 / 55. 11.100
  libavfilter     4.  3.100 /  4.  3.100
  libswscale      2.  6.100 /  2.  6.100
  libswresample   0. 18.100 /  0. 18.100
  libpostproc    52.  3.100 / 52.  3.100
Input #0, mov,mp4,m4a,3gp,3g2,mj2, from 'itv.mov':
  Metadata:
    major_brand     : qt
    minor_version   : 537199360
    compatible_brands: qt
    creation_time   : 2008-10-03 16:14:46
  Duration: 00:01:10.00, start: 0.000000, bitrate: 30337 kb/s
    Stream #0:0(eng): Audio: pcm_s16le (lpcm / 0x6D63706C), 48000 Hz,
stereo, s16, 1536 kb/s (default)
    Metadata:
      creation_time   : 2008-10-03 16:14:46
      handler_name    : Apple Alias Data Handler
    Stream #0:1(eng): Subtitle: mov_text (text / 0x74786574), 720x20, 0 kb/s
    Metadata:
      creation_time   : 2008-10-03 16:22:31
      handler_name    : Apple Alias Data Handler
    Stream #0:2(eng): Video: dvvideo (dvcp / 0x70637664), yuv420p, 720x576
[SAR 16:15 DAR 4:3], 28800 kb/s, SAR 59:54 DAR 295:216, 25 fps, 25 tbr, 25
tbn, 25 tbc (default)
    Metadata:
      creation_time   : 2008-10-03 16:58:34
      handler_name    : Apple Alias Data Handler


thanks,
MB