ffmpeg源码分析--15.命令说明

1. 视频裁剪
./ffmpeg_bak -ss 100 -t 120 -i ../res/san.mp4  -vcodec copy -acodec copy san2.mp4
ffmpeg -ss START -t DURATION -i INPUT -vcodec copy -acodec copy OUTPUT
-ss: 100从视频的100s处开始裁剪
-t:  120要截取120s的视频
-i: 输入视频文件
./ffmpeg_bak -ss 110 -t 30 -i ../res/san.mp4  -vcodec copy -acodec copy san2.mp4

2.视频转yuv
./ffmpeg_bak -i ../res/san.mp4  -vcodec rawvideo -pix_fmt  yuv420p ./san.yuv
./ffmpeg_bak -i ../res/san_470_352_30s.mp4  -vcodec rawvideo -pix_fmt  yuv420p ./san_470_352_30s.yuv

3.YUV序列播放
./ffplay_bak  -f rawvideo -video_size 480*272  ../res/ds_480x272.yuv
./ffplay_bak -f rawvideo -video_size 470*352  san_470_352_30s.yuv

4. YUV序列转AVI
./ffmpeg_bak -s 480*272 -pix_fmt yuv420p -i ../res/ds_480x272.yuv -vcodec mpeg4 output.avi