New to video editing. encoding with 2 different resolutions

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New to video editing. encoding with 2 different resolutions

Postby OMGapotato » Wed Apr 06, 2011 9:49 pm

Sorry guys I just started video editing so I'm trying to get over the huge learning curve. I'm currently using adobe premiere pro cs4. I made an amv that has the same anime with 2 resolutions, 1 is 720p and the other is 480p. How do i convert the 720p into 480p or expand the 480p(though that'll have severe consequences to the quality i'm assuming)?

again, i apologize for probably reposting a similar thread.

here's a link to the video i'm talking about
http://www.youtube.com/watch?v=Q17KlxrvAvI

thanks
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Re: New to video editing. encoding with 2 different resoluti

Postby OMGapotato » Wed Apr 06, 2011 11:03 pm

also, i tried using a video converter to convert the 720p .mkv files into h.264 .mp4 720x480 files but it didn't change the resolution at all. still stayed at 720p.
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Re: New to video editing. encoding with 2 different resoluti

Postby Kariudo » Wed Apr 06, 2011 11:33 pm

Most would recommend scaling the 720p source down.
There's 2 methods you could use (well, there are more than 2 methods...but these two are probably the ones you'll hear over and over)

Avisynth
VirtualDub

Of the two, VirtualDub is easier (google it if you don't have it). Once you load your video you go to video->filters->add and then scroll until you find resize. Highlight it and click ok (or double click it) and you'll get the resize dialog.

For new size, put 480 for the height.
For aspect ratio, select same as source
Leave filter mode as bicubic
For framing options, choose Letterbox/crop to size and put 720 x 480 in for the size (or 640 x 480 if you resized your other footage to a square pixel aspect ratio)

Once you're more comfortable with editing and video preparation, I'd suggest using avisynth as it gives you more control.

I'm sure some people will come prancing in here trying to argue technical minutiae of why this isn't 100% correct...but meh, this is good enough.

Vdub spits out AVI files, and to make sure they play nicely with editing programs you should save them with a lossless codec (Ut Video is the current recommendation). You have to set the codec before saving. Go to video->compression and then choose your codec. Beware that lossless = very big, so it's not recommended to save entire episodes like this. Instead, select small clips to encode.
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Re: New to video editing. encoding with 2 different resoluti

Postby Mister Hatt » Thu Apr 07, 2011 12:18 am

I don't know if this counts as "technical minutiae" but arbitrarily changing the aspect ratio without compensating for it is a really bad idea, just sayin'.
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Re: New to video editing. encoding with 2 different resoluti

Postby OMGapotato » Thu Apr 07, 2011 1:01 am

thanks a lot Kariudo. this is good stuff.
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Re: New to video editing. encoding with 2 different resoluti

Postby Kariudo » Thu Apr 07, 2011 1:59 am

Mister Hatt wrote:I don't know if this counts as "technical minutiae" but arbitrarily changing the aspect ratio without compensating for it is a really bad idea, just sayin'.

The aspect ratio isn't changing :awesome:
...not in the resizing part at least
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Re: New to video editing. encoding with 2 different resoluti

Postby LegendaryEd » Thu Apr 07, 2011 1:21 pm

Kariudo wrote:Most would recommend scaling the 720p source down.


I'm kinda newbish when it comes to all of this, but why would scaling down the 720p be preferable?
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Re: New to video editing. encoding with 2 different resoluti

Postby Kariudo » Thu Apr 07, 2011 1:33 pm

because if you scale the 480p stuff up, it'll look terrible compared to your other HD footage.
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Re: New to video editing. encoding with 2 different resoluti

Postby LegendaryEd » Thu Apr 07, 2011 1:41 pm

And suddenly, I feel like an imbecile for not realizing the context in which you said that. I gotcha, thanks haha
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Re: New to video editing. encoding with 2 different resoluti

Postby Mister Hatt » Thu Apr 07, 2011 7:53 pm

Actually it does. Resizing changes the PAR, cropping changes the DAR. Video basics really.
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Re: New to video editing. encoding with 2 different resoluti

Postby mirkosp » Fri Apr 08, 2011 2:28 am

Mister Hatt wrote:Actually it does. Resizing changes the PAR, cropping changes the DAR. Video basics really.

But what if one resizes so that the par is identical or crops certain precise amounts which leave the dar identical? :ying:
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Re: New to video editing. encoding with 2 different resoluti

Postby Cannonaire » Fri Apr 08, 2011 3:41 am

I don't really see a problem with resizing the 720p footage in the way that Kariudo recommended. I tried out the method myself because I wasn't familiar with resizing in Virtualdub; while it's not my method of choice, it did work just fine and it kept the same PAR because of the options recommended.

I would just like to highly recommend that the 480p footage also be resized in order to match the Pixel Aspect Ratio (PAR) of the resized 720p content, otherwise half your footage will look stretched and the other half will be cropped in a weird way. You can read the info on cropping/resizing in a guide here: http://www.animemusicvideos.org/guides/avtech31/
It's not precise, but it's pretty well standard around here. If you care enough to use exact numbers for resizing, just ask and I can definitely help you out, I just don't want to derail this thread. Also, thanks to this thread and some experimentation, I now know how to do exact resizes in Virtualdub based on the numbers given by the AR calc. If you don't want to use avisynth yet, I can tell you how to do the resizing in Virtualdub. Thanks!
AR Calc: http://ps-auxw.de/cgi-bin/ar-calc.pl
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Re: New to video editing. encoding with 2 different resoluti

Postby OMGapotato » Fri Apr 08, 2011 1:53 pm

thanks. i've been reading the A&E technical guide and i must say, for someone who isn't well versed in video technology, it was really insightful. thanks to whoever made it.

i'm probably going to use avisynth since the guide requires the use of it. i'll probably post questions about resizing later after i'm done with the guide. thanks for the calculator though. i'm sure i'll need that later
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