[gst-devel] Please help me!!!
rbultje at ronald.bitfreak.net
Mon Nov 25 04:05:08 CET 2002
On Mon, 2002-11-25 at 04:44, Gustavo Sverzut Barbieri wrote:
> 3) I want to be able to seek in the stream(both live and already
> recorded), so I can go to directly to the minutes I want (from the file
> named as the hour it was recorded)
Then you definately need MPEG.
> 4) In future I want to make one v4l card to record 2 or more
> channels at the same time (swaping between channels each frame, so I
> can record 2 or more cameras with only 1 v4l device)
I would *highly* disagree here. The card needs several moments to sync
with the new input, which would leave you with a framerate of maybe 2
fps per input. Using two cards is so much easier, and these cards are
> Since I cannot find a ready to use solution I'll develop mine and
> I'm thinking about gstreamer as my framework. But I want to know if it
> is possible to do and how to do that (basic guidelines). And some
> specific things about GStreamer:
> 1) There is a v4l capture interface?
Yes. v4lsrc (video4linux) and v4l2src (video4linux2) both exist.
> 2) There is any crop plugin so I can crop the border noise?
Not that I know of. You'd have to write your own.
> 3) There is any bitmap overlay plugin (so I can put the "clock" over
> the frames)
> 4) There is any stream server inside gstreamer that is seek capable
> and can output to any type of player (mplayer and windows media player
> by instance). What is the best format to stream?
There is no stream server plugin in Gst for video. We do have several
audio stream server plugins. MPEG is your choice, I guess...
> 5) How optimized are GStreamer encoders? It's possible to record 4
> v4l inputs at 640x480 @ 25 fps? It's possible to use lavcodec (from
> ffmpeg, very optimized)
We have ffmpeg encoder plugins.
Ronald Bultje <rbultje at ronald.bitfreak.net>
Linux Video/Multimedia developer
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