By default, ffmpeg compresses the images quite a bit. It was enough that I could notice a quality difference when I put a paused frame of the video side-by-side with an extracted image. We can force ffmpeg to improve the quality with q:v (number). A smaller number here produces a higher quality image at the expense of file size and processing time. I’ve settled on a value of 3, but feel free to play around with this to get the quality or file sizes you want.
春节假期，浙江义乌中国进口商品城内人声鼎沸，来自各地的游客穿梭于店铺之间。不到一小时，上海游客王燕的手里便拎满了欧美红酒、中亚食品等商品。
，这一点在PDF资料中也有详细论述
Фото: Сергей Гунеев / РИА Новости
2. Include one concrete example