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.
中东局势升级引爆全球市场，油价金价大涨
。爱思助手下载最新版本对此有专业解读
DigitalPrintPrint + Digital
行動策略有數十種，包括惡意舉報異見人士社交帳戶、大規模發布網路帖子，甚至偽造文件以及冒充美國官員恐嚇批評者等。
In a major address in Canberra on the last full day of his visit to Australia, Carney called for enhanced cooperation on critical minerals, defence and trade and announced Australia would join the G7 critical minerals alliance, the largest grouping of democratic countries with major reserves in the world.