ffmpeg分解与复用

• 视频转换

ffmpeg -i in.mp4 -vcodec copy -acodec copy out.flv

Stream #0:0(und): Audio: aac (LC) (mp4a / 0x6134706D), 44100 Hz, stereo, fltp, 127 kb/s (default)
    Metadata:
      handler_name    : Sound Media Handler
    Stream #0:1(und): Video: h264 (Main) (avc1 / 0x31637661), yuv420p(tv, bt709), 1024x576 [SAR 1:1 DAR 16:9], 993 kb/s, 23.98 fps, 23.98 tbr, 48k tbn, 47.95 tbc (default)

• 视频转换不要音频

ffmpeg -i in.mp4 -vcodec copy -an out.flv

• 视频转换不要视频

ffmpeg -i in.mp4 -vn -acodec copy out.aac