[HELP] Avisynth script in Hybrid

[Selur]

Hybrid takes the PAR (= pixel aspect ratio) that is signaled from the input and passed it through to the output.
If your input isn't properly flagged you can set the PAR under "Crop/Resize->Base->Pixel Aspect Ratio (PAR)->Input PAR".
If you don't know the correlation between PAR and DAR (= display aspect ratio) read: https://en.wikipedia.org/wiki/Pixel_aspect_ratio

You normally also can change the PAR by remuxing (Audio&Video set to Passthrough) and setting "Muxing->Overwrite->Pixel aspect ratio".

Cu Selur

Ps.: I hope you know what you are doing since 5/4 is a rather uncommon display aspect ratio,...