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.
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更严重的是，伊朗政权虽然意识到基本盘在流失，却因自身已被利益集团深度绑架而束手无策。任何试图调整分配结构、触动既得利益的改革，都会直接威胁到捍卫者共同体的内部团结，进而动摇政权赖以生存的基础。
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