ffmpeg / ffplay cli interactive interface

ffmpeg를 실행하고 ?를 누르고 엔터치면 아래처럼 무언가 도움말이 나온다.

key    function ?      show this help +      increase verbosity -      decrease verbosity c      Send command to first matching filter supporting it C      Send/Queue command to all matching filters D      cycle through available debug modes h      dump packets/hex press to cycle through the 3 states q      quit s      Show QP histogram

c 누르고 하면 먼가 이상한게 뜨는데.. 찾아도 잘 안나온다.

Enter command: <target>|all <time>|-1 <command>[ <argument>]

찾아보니.. 필터별로 명령어를 보내는 거라고..

libavcodec 쪽으로도 명령어 보내서 네비게이션 가능하려나?

[링크 : https://stackoverflow.com/questions/48635380/ffmpeg-interactive-mode-help-options]

[링크 : https://ffmpeg.org/ffmpeg-filters.html#sendcmd_002c-asendcmd]

[링크 : https://ffmpeg.org/ffmpeg-filters.html]

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요건 ffplay

while playing        q, ESC            Quit.        f   Toggle full screen.        p, SPC            Pause.        m   Toggle mute.        9, 0            Decrease and increase volume respectively.        /, *            Decrease and increase volume respectively.        a   Cycle audio channel in the current program.        v   Cycle video channel.        t   Cycle subtitle channel in the current program.        c   Cycle program.        w   Cycle video filters or show modes.        s   Step to the next frame.            Pause if the stream is not already paused, step to the next video frame, and pause.        left/right            Seek backward/forward 10 seconds.        down/up            Seek backward/forward 1 minute.        page down/page up            Seek to the previous/next chapter.  or if there are no chapters Seek backward/forward            10 minutes.        right mouse click            Seek to percentage in file corresponding to fraction of width.        left mouse double-click            Toggle full screen.

[링크 : http://manpages.ubuntu.com/manpages/cosmic/man1/ffplay.1.html]

[링크 : http://www.herongyang.com/Flash/Video-Stream-FFmpeg-ffplay-Interactive-Command.html]