Going to need help to get my new composition

I use AE 13.7.   I'm very new to AE, and essentially I learned by doing, as opposed to the meeting through tutorials without end that does not give me answers my questions.

So, here are my questions.

1. when I open a new composition, I choose the height and width.  How can I know what they are supposed to be?   I guess I have to choose the dimensions based on the video I'm importing, but do not know how to find this information.

2. once I imported a video file and hung out with success since the upper left corner in the main typing area in the center of the screen, I can either press the SPACEBAR to start my video or switch to the preview in the upper right quarter and press Play.  But once I get the video to play, he just moves along.  I noticed that as the blue indicator now inches along, it leaves a thin horizontal trace of green or dark blue line.  I have deduced that this has something to do with how much of the video is actually recognized somehow by AE, because if I try manually move the CTI beyond the blue or green line, breaks down the video.

I guess that there must be a step or two that I'm missing here.  I think that the video, once imported into a new publication, would be immediately available in its entirety.  What I'm missing or doing wrong here?  Thanks for your help!

1. when I open a new composition, I choose the height and width. How can I know what they are supposed to be?

Depends entirely on your target output specifications and your workflow. Of course we'd take a HD for broadcast television, other presets for other stuff. This may be the same as the input source, but not necessarily. Still nothing prevents you to create arbitrary comp sizes when they are needed for example to the compositions nested when creating the project. It is not uncommon to create for example compositions of towel-long /-wide for all kinds of scroll, Parallax and effects just panorama regarding the effects of particle instance can a model of aspect square small pixel size to be used as custom particle shape. Beyond what I said in the first sentence as there may be a definitive answer in marble.

2. once I imported a video file and successfully... [snip]

Uh, well... You know, I would scream in your face if you stood in front of me. Sorry, there is no other way to say it, but that's all just a thing ' Why oh why don't people read the help? How preview of AE and caching system works is carefully explained here, including what those fancy color average.

What I'm missing or doing wrong here?

According to the above: do not read the help files is your greater negligence.

Mylenium

Tags: After Effects

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