Question / Help dealing with square pixels versus rectangular pixels

[Jean-Luc Droitcourt]

Hello when encoding PAL 720x776 i got 5/4 form factor instead of expected 4/3
the only way I found is to use 768x576 which is bad.
I suspect this issue is due to pixel format
so How to get pixel format as a parameter ?
Thanks
======= report from Mediainfo===================================

Nom complet : E:\Eve 25 01 20\Starmania.mp4
Format : MPEG-4
Profil du format : Base Media
Identifiant du codec : isom (isom/iso2/avc1/mp41)
Taille du fichier : 4,10 Gio
Durée : 1 h 53 min
Débit global moyen : 5 168 kb/s
Application utilisée : Lavf58.20.100

Vidéo
ID : 1
Format : AVC
Format/Info : Advanced Video Codec
Profil du format : High@L3
Paramètres du format : CABAC / 5 Ref Frames
Paramètres du format, CABAC : Oui
Paramètres du format, RefFrames : 5 images
Paramètres du format, GOP : M=4, N=50
Identifiant du codec : avc1
Identifiant du codec/Info : Advanced Video Coding
Durée : 1 h 53 min
Débit : 5 000 kb/s
Largeur : 720 pixels
Hauteur : 576 pixels
Format à l'écran : 5/4
Type d'images/s : Constant
Images par seconde : 25,000 Im/s
Norme : PAL
Espace de couleurs : YUV
Sous-échantillonnage de la chrominance : 4:2:0
Profondeur des couleurs : 8 bits
Type de balayage : Progressif
Bits/(Pixel*Image) : 0.482
Taille du flux : 3,97 Gio (97%)
Bibliothèque utilisée : x264 core 157 r2945 72db437
Paramètres d'encodage : cabac=1 / ref=5 / deblock=1:0:0 / analyse=0x3:0x113 / me=hex / subme=8 / psy=1 / psy_rd=1.00:0.00 / mixed_ref=1 / me_range=16 / chroma_me=1 / trellis=2 / 8x8dct=1 / cqm=0 / deadzone=21,11 / fast_pskip=1 / chroma_qp_offset=-2 / threads=12 / lookahead_threads=2 / sliced_threads=0 / nr=0 / decimate=1 / interlaced=0 / bluray_compat=0 / constrained_intra=0 / bframes=3 / b_pyramid=2 / b_adapt=1 / b_bias=0 / direct=3 / weightb=1 / open_gop=0 / weightp=2 / keyint=50 / keyint_min=5 / scenecut=40 / intra_refresh=0 / rc_lookahead=50 / rc=cbr / mbtree=1 / bitrate=5000 / ratetol=1.0 / qcomp=0.60 / qpmin=0 / qpmax=69 / qpstep=4 / vbv_maxrate=5000 / vbv_bufsize=5000 / nal_hrd=none / filler=1 / ip_ratio=1.40 / aq=1:1.00
Gamme de couleurs : Full
Codec configuration box : avcC
========================

 

[BluePeer]

little confusion here
if you mean the obs record resolution you can enter any pixelXpixel what you type in its a free text input field
a logfile with record post can help to figure out what you mean

 

[Jean-Luc Droitcourt]

Hello "BluePeer
Thanks for help
Let me summarize the process I go through ( I am digitizing old analog video from VHS or others )

Input is either PAL or SECAM in either composite , Svideo or Component
Format is 720x576 4:3 form factor
I use an acquisition card from Blackmagic design inside the Windows based PC
This acquisition is either driven via Magix S/W and now preferably OBS studio
On Magix I got MPEG2 720x576 4:3
On OBS Studio ( using 720x576 parameters ) I got MPEG4 720x576 5:4 which obviously does'nt display properly on any screen ( PC or TV )
in order to get proper display I have to set the OBS parameters to 768x576 but in that case I got other troubles with video editing S/W

I hope it clarifies

Thanks and regards
Jean-Luc