[vlc-devel] How to control an automated recording (directshow capture)?

Damien Leri damien at law.upenn.edu
Tue Sep 1 13:11:26 CEST 2009


TS encapsulation does not fix the problem: vlc still does not respond to a quit signal (WM_CLOSE) when the video has been recording for more than an hour or so.

Here is the full command:

Vlc.exe --no-qt-privacy-ask dshow://  :dshow-vdev="Hi-Speed USB DVD Creator" :dshow-adev="iMic USB audio system" :no-dshow-config :no-dshow-tuner :dshow-size="640x480" :sout=#transcode{vcodec=h264,vb=800,scale=1,acodec=mp4a,ab=128,channels=2,samplerate=44100}:std{access=file,mux=ts,dst="c:\test.ts"}

Thanks anyway,

-----Original Message-----
From: vlc-devel-bounces at videolan.org [mailto:vlc-devel-bounces at videolan.org] On Behalf Of Kaarlo Räihä
Sent: Wednesday, August 26, 2009 2:00 PM
To: Mailing list for VLC media player developers
Subject: Re: [vlc-devel] How to control an automated recording (directshow capture)?

Damien Leri kirjoitti 26.08.2009 kello 17:20:
> Hi,
> I would like to use VLC to record classroom sessions. To start the
> recording I just call vlc.exe, and to end the recording I send a
> signal to the process (using Process.exe). For years this has worked
>  fine
> for me as far as MP3 recordings. But not with H.264, for a recording
>  that
> is longer than an hour or so: the process does not accept the WM_CLOSE
> signal, even when I give it several hours as a grace period. So the
>  process
> continues and the file continues to grow. If I force a KILL, the
>  file does
> not appear to be playable.

If you use TS encapsulation (Transport Stream) you should always get playable file. 

> Is there a better way to control VLC from a script? I looked at the
>  remote
> control interfaces (rc, ncurses, telnet, http), but those appear to
>  be for
> playback rather than directshow capture. All I need to do is send
>  commands
> to Start, Pause, Resume, and Stop. Ideally I could have VLC running as a
> windows service, but that's not required. I'm running on v.1.0.1 on
>  Windows
> XP.
> Alternatively, if I should be doing this directly with ffmpeg or the
>  like,
> I am open to suggestions. I am scripting in Perl, not C.
> Thanks,
> Damien

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