Source Pixel Aspect Ratio

Questions and answers on how to get the most out of FFAStrans
Post Reply
dylanreeve
Posts: 12
Joined: Fri Aug 19, 2016 4:37 am

Source Pixel Aspect Ratio

Post by dylanreeve »

Hi,

I can't find a way to force or set the pixel aspect ratio for an input. I have a variety of PAL SD files and I can't trust the aspect ratio flags in the files. Some will be correctly 1.066 (PAL 4:3) but others should be processed as 1.42 (PAL 16:9).

I can correctly identify these by eye, and build two workflows for processing them, but I can't find a way in the workflow to force the processors to assume or assign a specific PAR for the source footage, meaning any resizes I apply may not be correct.

Is there an easy way I'm missing somewhere to force this?
emcodem
Posts: 1811
Joined: Wed Sep 19, 2018 8:11 am

Re: Source Pixel Aspect Ratio

Post by emcodem »

Hi Dylan,

what do you want to do, leave the codec but just override the AR or encode (what format, HD, SD, other)?
If Encode, did you check out the Resizing property of the encoders?
Basically the only problem you have should be when the source is flagged 4x3 but it is anamorphic 16x9, in this case the Stretch option might be what you like?
emcodem, wrapping since 2009 you got the rhyme?
dylanreeve
Posts: 12
Joined: Fri Aug 19, 2016 4:37 am

Re: Source Pixel Aspect Ratio

Post by dylanreeve »

I think i've figured that I can use the "sar" param in the x264-params to force the encoder to interpret the incoming footage the way I want.
emcodem
Posts: 1811
Joined: Wed Sep 19, 2018 8:11 am

Re: Source Pixel Aspect Ratio

Post by emcodem »

Hehe yeah there are many ways to get to the goal :D
emcodem, wrapping since 2009 you got the rhyme?
Post Reply