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FFmpeg can compute various visual quality metrics such as PSNR, SSIM, and VMAF using two existing encodings in a separate command line after encoding has finished. This is okay for offline or VOD use cases, but not for livestreaming where we might want to compute quality metrics in real time.。新收录的资料对此有专业解读
Advanced photo editing features like blurring or erasing a specific area are missing.，更多细节参见新收录的资料
First FT: the day’s biggest stories。业内人士推荐新收录的资料作为进阶阅读
Set global line mark 0. Global marks are always valid