[FFmpeg-user] Upscaling SD 4x3 to FullHD 16x9 - Aspect Ratio problem

[Christoph Gerstbauer]

Hello I am trying to upscale a 720x608 (incl VBI) 25i 4:3 source to
1920x1080 25i 16:9.

My deinterlacing and reinterlacing is working, scaling and cropping too.
But I have understanding problem how to use the videofilter regarding
aspect ratios.

My source is 4:3 and the target is 16:9.
For the target I am expecting that I get a PillarBox FullHD image (black
bars left and right) where the original 4:3 aspect ratio of the source is
kept.
PROBLEM: But I get only a stretched 16:9 HD version of the 4:3 original
image. (no black bars at left and right)
See files:
https://www.dropbox.com/s/mgwmiitcpgta0ym/scalertest.zip?dl=0

CommandLineOutput:

ffmpeg -i "F:\scaler test\_5sec.avi" -vf "crop=720:576:0:32, setfield=tff,
yadif=1:0:0, scale=-1:1080, tinterlace=interleave_top, fieldorder=tff"
-vcodec ffvhuff -an -s 1920x1080 -aspect 16:9 "F:\scaler
test\_5sec_fullHDinterlaced.avi"
ffmpeg version 3.4 Copyright (c) 2000-2017 the FFmpeg developers
  built with gcc 7.2.0 (GCC)
  configuration: --enable-gpl --enable-version3 --enable-sdl2
--enable-bzlib --enable-fontconfig --enable-gnutls --enable-iconv
--enable-libass --enable-libbluray --enable-libfreetype --enable-libmp3lame
--enable-libopenjpeg --enable-libopus --enable-libshine --enable-libsnappy
--enable-libsoxr --enable-libtheora --enable-libtwolame --enable-libvpx
--enable-libwavpack --enable-libwebp --enable-libx264 --enable-libx265
--enable-libxml2 --enable-libzimg --enable-lzma --enable-zlib --enable-gmp
--enable-libvidstab --enable-libvorbis --enable-cuda --enable-cuvid
--enable-d3d11va --enable-nvenc --enable-dxva2 --enable-avisynth
--enable-libmfx
  libavutil      55. 78.100 / 55. 78.100
  libavcodec     57.107.100 / 57.107.100
  libavformat    57. 83.100 / 57. 83.100
  libavdevice    57. 10.100 / 57. 10.100
  libavfilter     6.107.100 /  6.107.100
  libswscale      4.  8.100 /  4.  8.100
  libswresample   2.  9.100 /  2.  9.100
  libpostproc    54.  7.100 / 54.  7.100
Input #0, avi, from 'F:\scaler test\_5sec.avi':
  Metadata:
    encoder         : Lavf58.12.100
  Duration: 00:00:05.00, start: 0.000000, bitrate: 116115 kb/s
    Stream #0:0: Video: ffvhuff (FFVH / 0x48564646), yuv422p, 720x608,
107684 kb/s, SAR 152:135 DAR 4:3, 25 fps, 25 tbr, 25 tbn, 25 tbc
    Stream #0:1: Audio: pcm_s24le ([1][0][0][0] / 0x0001), 48000 Hz, 7.1,
s32 (24 bit), 9216 kb/s
File 'F:\scaler test\_5sec_fullHDinterlaced.avi' already exists. Overwrite
? [y/N] y
Stream mapping:
  Stream #0:0 -> #0:0 (ffvhuff (native) -> ffvhuff (native))
Press [q] to stop, [?] for help
Output #0, avi, to 'F:\scaler test\_5sec_fullHDinterlaced.avi':
  Metadata:
    ISFT            : Lavf57.83.100
    Stream #0:0: Video: ffvhuff (FFVH / 0x48564646), yuv422p, 1920x1080
[SAR 1:1 DAR 16:9], q=2-31, 200 kb/s, 25 fps, 25 tbn, 25 tbc
    Metadata:
      encoder         : Lavc57.107.100 ffvhuff
frame=  125 fps= 53 q=-0.0 Lsize=  200261kB time=00:00:05.00
bitrate=328108.1kbits/s speed=2.14x
video:200253kB audio:0kB subtitle:0kB other streams:0kB global headers:0kB
muxing overhead: 0.004325%


Best Regards
Christoph Gerstbauer