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Hi guys, I have one last aspect ratio question, thanks in advance

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jonathan young
Hi guys, I have one last aspect ratio question, thanks in advance
on Mar 4, 2013 at 1:02:26 pm

I have a client who wants 16:9 1290X720 and 16:9 720X480 both videos need to be compressed to mpg4 from a 1920X1080 video. When I compress the 480 video I am using 853X480 with a 16:9 anamorphic NTSC setting (which should make 720X480), however when I do that setting the video is compressed looking more strecthed compared to my 1280X720 mpg4 video.
Here is how it looks



I am using Apple Compressor
Thanks to all have applied to my recent aspect ratio post, it is GREATLY appreciated guys :-)


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Bret Williams
Re: Hi guys, I have one last aspect ratio question, thanks in advance
on Mar 4, 2013 at 1:56:03 pm

You should be making a 720x480 video with a anamorphic setting. The player will see the anamorphic flag and stretch it out to 853x480. There is no such thing as an 853x480 format. That is the dimensions that the player stretches it to.

If you were outputting for web use (not DVD, which is pretty much the only place the anamorphic is used except acquisition) you'd output 853x480 for an SD sized 16x9 video.

What you have is a mutant. And 853x480 video that is flagged anamorphic, so then it's stretching it out to 1024x480 or something of that sort. A 20:9 video if you will.


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Ryan Holmes
Re: Hi guys, I have one last aspect ratio question, thanks in advance
on Mar 4, 2013 at 2:20:36 pm

You're dealing with PAR (Pixel Aspect Ratio) values here, not so much physical dimensions. You're on the right track though.

Suffice it to say, the Bret is exactly right. Just encode in Compressor as 720x480 with a 16x9 Pixel Aspect box selected (NTSC CCIR 601). It's located in the Geometry tab inside the Inspector in Compressor. Select that, recompress and enjoy!

Ryan Holmes
http://www.ryanholmes.me
vimeo.com/ryanholmes


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Rafael Amador
Re: Hi guys, I have one last aspect ratio question, thanks in advance
on Mar 4, 2013 at 2:55:50 pm

Your client wants MP4, so I guess for a web site or to be played on a computer.
Then FORGET about NTSC, and ANAMORPHIC.
You are in SQUARED PIXELS-land.
Leave the ANAMORPHIC button UNCHECKED.

[jonathan young] "When I compress the 480 video I am using 853X480 with a 16:9 anamorphic NTSC setting (which should make 720X480),"
That's very wrong.
Set 853x 480 Squared pixels and uncheck Anamorphic.
In fact, 852x480 would be better size for the compression.
rafael


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Bret Williams
Re: Hi guys, I have one last aspect ratio question, thanks in advance
on Mar 4, 2013 at 3:21:02 pm

853x480 is more accurate ration at 1.77708333333333 vs 852x480 at 1.75 since 16x9 is 1.77777777777778.


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Ryan Holmes
Re: Hi guys, I have one last aspect ratio question, thanks in advance
on Mar 4, 2013 at 4:25:25 pm

Jonathan - both Bret and Rafael are correct. It just depends on what you're going to do with the output. So your two options to drop down to widescreen SD are really:
(1) 853x480 Square Pixel Aspect Ratio (good for web posting)
(2) 720x480 Anamorphic 16x9 (good if you're burning a DVD or going to SD broadcast)

Ryan Holmes
http://www.ryanholmes.me
vimeo.com/ryanholmes


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Rafael Amador
Re: Hi guys, I have one last aspect ratio question, thanks in advance
on Mar 5, 2013 at 1:53:49 am

[Bret Williams] "853x480 is more accurate ration at 1.77708333333333 vs 852x480 at 1.75 since 16x9 is 1.77777777777778."
853 is not a multiplier of "4".
When making mp4/h264, is convenient that both sides are multipliers of "4", in order of building the 4x4 pixels macroblocks.
rafael


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Bret Williams
Re: Hi guys, I have one last aspect ratio question, thanks in advance
on Mar 8, 2013 at 6:23:58 pm

In that case, 854x480 would be a slightly better ration than 854. I've seen 854 used a bit. But not 852.


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