Anamorphic Video Resise

[Seraphic-]

Hi,

If you have a 480p video that is 16:9 and recorded 720x480, would it be recommended to resize to 852x480 or 854x480?
Obviously, the correct resolution is 853x480. However, since it is an odd number, it cannot be achieved.
Should I resize to 852x480 or 854x480 (then crop the black bars down to mod16)?

Thanks

Demo Anamorphic Video Resise 720x480 to 852x480
http://www.temp.seraphicgate.com/852.png

[check]

Hi,

If you have a 480p video that is 16:9 and recorded 720x480, would it be recommended to resize to 852x480 or 854x480?
Obviously, the correct resolution is 853x480. However, since it is an odd number, it cannot be achieved.
Should I resize to 852x480 or 854x480 (then crop the black bars down to mod16)?

Thanks

Demo Anamorphic Video Resise 720x480 to 852x480
http://www.temp.seraphicgate.com/852.png
Neither. Crop all the black bars off and to at least mod4 (or just resize to mod16), encode at this resolution, set the playback AR in the container or bitstream. You can create anamorphic video yourself you know ;-) This is generally the most useful method.

[Seraphic-]

Neither. Crop all the black bars off and to at least mod4 (or just resize to mod16), encode at this resolution, set the playback AR in the container or bitstream. You can create anamorphic video yourself you know ;-) This is generally the most useful method.

Hi,

Yeah, I thought of that. But the thing is I need to add overlay video and images to the video and it would be much easier to be able to work with one size so I can design the work for that size.

Reason I was asking if I should go to 852x480 or 854x480. :confused:

[Brother John]

720 * 32/27 = 853,3333333333333...
854 is the nearest number, but it’s only mod2. 852 is mod4. If you have anything in the processing chain that requires mod4 (e.g. AviSynth) pick 852, otherwise 854.

[Seraphic-]

720 * 32/27 = 853,3333333333333...
854 is the nearest number, but it’s only mod2. 852 is mod4. If you have anything in the processing chain that requires mod4 (e.g. AviSynth) pick 852, otherwise 854.

Thanks for the help check/Brother John

I think I'll have to go with 852 then as AviSynth will be used.

On a side note, it just so happens that a crop of the visible area when using 852x480 works out to 756x448, which is perfect mod4.
However, when using x264 for final encoding, how much of an issue would it be to use this 756x448 mod4 resolution vs cropping to a 752x448 mod16 resolution?

Thanks

[Brother John]

Mod4 efficency will be lower than mod16. But the penalty is usually too small to worry about.

[check]

I should also mention that mod4 is about as low as you want to go in terms of playback compatibility. mod2 just creates pain with too many combinations of video card + driver.