[FFmpeg-user] ffmpeg v7.1 h264 (libx264) stretching video on X-axis (take2 w/ smaller pix)

[Ferdi Scholten]

On 03-01-2025 00:59, Dat Head wrote:
> first time posting here, take it easy on me ;-)
> seems i slightly exceeded the size limit and posting was truncated
>
> ffmpeg version 7.1-essentials_build-www.gyan.dev Copyright (c)
> 2000-2024 the FFmpeg developers
>    built with gcc 14.2.0 (Rev1, Built by MSYS2 project)
>
> here's my syntax:
>    ffmpeg -i $1 -c:v libx264 -crf 20 -c:a copy h264-$1
>
> you can clearly see the guitarist's face is much wider after h264 processing
>
> am i missing something obvious!?
>
> p.s. note the default help syntax doesn't work in v6.0 nor 7.1 (this
> is the command listed in https://trac.ffmpeg.org/wiki/Encode/H.264) :
>
> ffmpeg -hide_banner -f lavfi -i nullsrc -c:v libx264 -preset help -f mp4 -
>     x264 [error]: invalid preset 'help'
>
>
Well overlaying both images on top of each other clearly shows the face 
did not get wider, however because the transcoded image lacks some fine 
details it appears to look wider.