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Does anyone have a good understanding of old DVD ripping software and the resolutions they used?
I have some old DVDs and television captures I want to make sure are running in the correct 4:3 aspect ratio. but the videos are in some funky resolutions like 680x548.
I know the standard for DVD video is 720x480 for NTSC and 720x576 for PAL, but there's also this business of blanking lines that may or may not have video information included in them. And then there's the whole notion of anamorphic aspect ratios.
The best I've come up with so far is finding common frames of reference and trying to correct from that.
I usually just look at the box which says on it what aspect ratio the video is and then work from there.
>>55595302
https://trac.handbrake.fr/wiki/AnamorphicGuide
as someone who spent a lot of time ripping shit, if you are autistic about it you're going to have a bad time.
>>55595327
That doesn't work when you are not working with the original source material. These are rips which were made years ago by someone unknown to me.
>>55595302
>television captures
just get the real thing.
>>55595335
Sometimes it can be hard to tell if a video was originally supposed to be anamorphic or not.
Top: Original
Bottom: Corrected to 4:3
Based on the truck tire I think 4:3 is correct.
>>55595438
Not always available.
>>55595302
because they crop blank lines.
Digitized analog NTSC video(480i/486i) usually contains 711 active lines but you're required to sample 720 lines (to allow some sensors to capture more information). So rippers crop those 9 black lines.
Same thing with PAL(576i), it contains 704 active lines and rippers crop the 16 black lines.
Some programs are recorded with different camera models so the resulting video may contain more or lesslines than the required(the first case is not a bad thing) but rippers are required(because of rules) to crop to the lowest common width.
Then you have to correct the aspect ratio, and it turns out rippers don't follow the ITU recommendations because of... rules, so they end cropping and/or resizing until you get a mod16/mod8 width that you can feed to the encoder.
>>55595438
>get the real thing
good, now try to get the master tapes of your favorite program.
>>55595441
Jesus, that example
widescreen DVDs use non-square pixels 1.2x1
720x480
480/9x16~853
853/720~1.2
also interlacing nightmare
halves horizontal resolution but you get 50/60fps
>>55595302
There's also 360x480, 360x576, 360x288, 360x240. Last two only support progressive video.
Oh and 704x576 is legal too.
