用法
ffmpeg [options] [[infile options] -i infile]… {[outfile options] outfile}…
Per-file main options
-f fmt
强制类型
-c codec
编解码器名称
-codec codec
编解码器名称
Video options
-vcodec codec
强制视频编解码器（’copy’复制流）
Audio options
-an
禁止音频
-acodec codec
强制音频编解码器名称（’copy’复制流）
试验
使用ffmpeg将一个文件转换为流向斗鱼推送
ffmpeg -re -i .\a.mp4 -vcodec copy -acodec aac -b:a 192k -f flv "rtmp://send3a.douyu.com/live/6109454rzeuAmtrz?wsSecret=9a7ee197ded9530fa79a35b86c564596&wsTime=5c429ca9&wsSeek=off&wm=0&tw=0"
使用ffmpeg将rtsp转换为rtmp向斗鱼推送
ffmpeg -i rtsp://198.168.1.108:8554/vlc -codec copy -f flv "rtmp://send3a.douyu.com/live/6109454rzeuAmtrz?wsSecret=9a7ee197ded9530fa79a35b86c564596&wsTime=5c429ca9&wsSeek=off&wm=0&tw=0"
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