With solid layer & without solid layer

[MahaB82A]

I am doing a tutorial that shows animation of a text. Some composition are with a solid layer and on it, some are not. And I found soil layers are useless in this context. Is there any criteria to decide when you need solid layer?  

[Mohammad.Harb · Accepted solution]

in your case, If you render the Video without solid background, you will get a black background,

if you have a solid color and you render the video you will get the exact solid background color in the rendered video 

[MahaB82A]

Thanks for your explanation.

[Rick Gerard · Accepted solution]

With almost all delivery codecs, transparency renders as black in the format you would use to share a video. Changing the Composition Background color is only really useful if you need to render an RGBA file, a file with transparency, and you need to Premultiply the anti-aliased edges of the footage with a specific color. That is a very rare workflow only used when you are assembling a composite that also needs further work. All editing and compositing apps default to straight alpha, and that produces the most acceptable results almost all of the time.

[MahaB82A]

Thanks for the explanation.