Questions tagged «4k»

2
如何在保持画质的同时使用ffmpeg将4k采样到1080p?
我有一些需要将MP4格式的4K 3840x2160素材降低到1080p。我尝试跑步 ffmpeg -i orig.mp4 -vf scale=1920:1080 smaller.mp4 但是结果却是非常差的质量,整个图像都是由正方形的“平铺”组成,好像我在放大4:1。 这是运行此命令的输出: Input #0, mov,mp4,m4a,3gp,3g2,mj2, from 'origs/P1000003.MP4': Metadata: major_brand : mp42 minor_version : 1 compatible_brands: mp42avc1 creation_time : 2015-02-19 17:10:38 Duration: 00:05:14.48, start: 0.000000, bitrate: 95903 kb/s Stream #0.0(und): Video: h264 (High), yuvj420p, 3840x2160 [PAR 1:1 DAR 16:9], 95792 kb/s, 25 fps, …
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