Bill basically nailed it. Canon cameras are great for getting your feet wet in video at a really affordable price. However as your skills and eye for quality increase, it might be wise to get a better camera as Canon DSLR’s are really limited in a number of ways. The weird effect on the roof is called aliasing, it is common in Canon DSLRs, it’s hard to predict when it will and will not occur, and there is not much you can do about it. You can get an anti-aliasing filter but it softens the video so I do not recommend it.
A few tips:
– Don’t shoot flat. Many people like doing so on canons (including myself for a while), however it is not practical. Without getting too technical, Canons shoot a heavily compressed codec so when you go to color correct later (which is the purpose of shooting flat) you can’t do much before you see strange noise patterns and other artifacts. It is best to get as close to the look you want in camera as possible and keep the color correction to a minimum.
– Keep your ISOs at multiples of 160. Because of the way Canons work, their “natural” ISOs are 160, 320, etc. AVOID multiples of 125 as they produce the most noise. (If you run a test you will see that ISO 125 actually gives you more noise than 160)
– If you don’t have the money for a better camera, pick up some good lenses. Quality glass is as important (if not more) than a good camera. Kit lenses generally produce a dull, soft, image. Some good/relatively cheap lenses I recommend:
https://www.bestbuy.com/site/canon-ef-50mm-f-1-8-ii-standard-lens-black/2473035.p?id=1218329521421&skuId=2473035&ref=06&loc=01&ci_src=14110944&ci_sku=2473035&extensionType=pla_multichannel:g&s_kwcid=PTC!pla!!!115759478199!g!!54377925759&kpid=2473035&k_clickid=23401463-f903-48ca-b0bc-17131374a665&kpid=2473035&lsft=ref:212,loc:1&ksid=23401463-f903-48ca-b0bc-17131374a665&ksprof_id=14&ksaffcode=pg9593&ksdevice=c
https://www.bhphotovideo.com/c/product/918894-REG/sigma_30mm_f_1_4_dc_hsm.html