[FFmpeg-user] Understanding multiple aspect ratios

[chirag parikh]

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On Tue, Apr 15, 2014 at 6:25 PM, Massimo Battistel <battistel at gmail.com>wrote:

> 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
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