如何从ffmpeg
的信息输出中获取视频的高度和宽度。例如,使用以下输出:
$ ffmpeg -i video.mp4
...
Input #0, mov,mp4,m4a,3gp,3g2,mj2, from 'video.mp4':
Metadata:
major_brand : isom
minor_version : 1
compatible_brands: isomavc1
creation_time : 2010-01-24 00:55:16
Duration: 00:00:35.08, start: 0.000000, bitrate: 354 kb/s
Stream #0.0(und): Video: h264 (High), yuv420p, 640x360 [PAR 1:1 DAR 16:9], 597 kb/s, 25 fps, 25 tbr, 25k tbn, 50 tbc
Metadata:
creation_time : 2010-01-24 00:55:16
Stream #0.1(und): Audio: aac, 44100 Hz, stereo, s16, 109 kb/s
Metadata:
creation_time : 2010-01-24 00:55:17
At least one output file must be specified
我怎么得到height = 640, width= 360
?