MPEG2 PS sample: wrong aspect ratio

[Underground78]

Summary of the bug:
This ​sample is detected as 4:3 by FFmpeg although it apparently should be 16:9. WinDVD plays it with the expected aspect ratio of 16:9 and MediaInfo also reports it to be 16:9.

How to reproduce:

> ffmpeg -i "VR_MOVIE_GuyMartinsSpitfireBcast169 qsf lappyAspectNoChnge_extract.mpg"
ffmpeg version N-68211-g4a0b1d9 Copyright (c) 2000-2014 the FFmpeg developers
  built on Dec  4 2014 22:02:36 with gcc 4.9.2 (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-libbs2b --enable-libcaca --enable-libfreetype --enable-libgme --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-libwebp --enable-libx264 --enable-libx265 --enable-libxavs --enable-libxvid --enable-decklink --enable-zlib
  libavutil      54. 15.100 / 54. 15.100
  libavcodec     56. 14.100 / 56. 14.100
  libavformat    56. 15.102 / 56. 15.102
  libavdevice    56.  3.100 / 56.  3.100
  libavfilter     5.  2.103 /  5.  2.103
  libswscale      3.  1.101 /  3.  1.101
  libswresample   1.  1.100 /  1.  1.100
  libpostproc    53.  3.100 / 53.  3.100
Input #0, mpeg, from 'VR_MOVIE_GuyMartinsSpitfireBcast169 qsf lappyAspectNoChnge_extract.mpg':
  Duration: 00:00:09.02, start: 0.200000, bitrate: 9119 kb/s
    Stream #0:0[0x1e0]: Video: mpeg2video (Main), yuv420p(tv), 720x576 [SAR 16:15 DAR 4:3], max. 9263 kb/s, 25 fps, 25 tbr, 90k tbn, 50 tbc
    Stream #0:1[0x80]: Audio: ac3, 48000 Hz, stereo, fltp, 384 kb/s
At least one output file must be specified

[Carl Eugen Hoyos]

WMP starts the file 4:3 as MPlayer, vlc and FFplay do, after a moment it changes the aspect ratio to 16:9.

[Michael Niedermayer]

Fixed in 1010b36d8672d891e77aa713e07ff749e8b0797f

[Michael Niedermayer]

this bug is back, its now a regression since 924a6f3cc7788e2d258348b1547a49805091ea2d

[James]

Is this sample available anywhere? Also, how does b2a0a2e6f5 affect this? It's a check that should not trigger for a decodable file.

[Michael Niedermayer]

Replying to James:

Is this sample available anywhere? Also, how does b2a0a2e6f5 affect this? It's a check that should not trigger for a decodable file.

The commit is off by 1, its 924a6f3cc7788e2d258348b1547a49805091ea2d, teh sample is available at ​https://samples.ffmpeg.org/ffmpeg-bugs/trac/ticket4161/