我是 ffmpeg 的初学者。
我想将几个图像转换为幻灯片并想出了这个命令：
ffmpeg -y -r 1/5 -i *.jpg -r 25 output.mp4
很直接。然而，视频似乎只有一帧长（我识别得太快了）
这是上述命令的输出：
ffmpeg version 0.8.9-4:0.8.9-0ubuntu0.12.04.1, Copyright (c) 2000-2013 the Libav developers
built on Nov 9 2013 19:12:07 with gcc 4.6.3
*** THIS PROGRAM IS DEPRECATED ***
This program is only provided for compatibility and will be removed in a future release. Please use avconv instead.
Input #0, image2, from 'swirl3777.jpg':
Duration: 00:00:05.00, start: 0.000000, bitrate: N/A
Stream #0.0: Video: mjpeg, yuvj444p, 1600x1200 [PAR 72:72 DAR 4:3], 0.20 …