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I know to take a picture you type into the command line: fswebcam name.jpg. And a photo will be taken and saved to the file name.jpg.

But I want to see the picture I am taking. Like how you do it on a photo, you aim and shoot.

How can I do this on a Rasperry Pi 3B with a USB webcam?

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    For example fswebcam -|display The display tool is part of the ImageMagick (alternative: GraphicsMagick) package. You need to be more specific in your question and also, this question isn't very specific to the Raspberry Pi. – Janka Jun 4 '18 at 17:45
  • Nothing happen. It just said Writing JPEG image to '-'. What does that mean? – most venerable sir Jun 4 '18 at 18:44
  • According to the manpage, it should write the captured image to stdout. The pipe symbol | then redirects stdout into stdin of the next program in the pipeline, display, which displays the received image data. But it seems the manpage of fswebcam is wrong then. Try without the -, maybe that works as intended with your version of fswebcam. – Janka Jun 4 '18 at 18:51
  • Do you use Raspbian Stretch Lite (try raspberrypi.stackexchange.com/a/78119/78211 ) or a desktop environment (which one)? – Fabian Jun 4 '18 at 19:07
  • @Fabian, I use LXPanel 0.9.3 – most venerable sir Jun 5 '18 at 13:47
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You could use mplayer to watch the video stream, and press "s" to take a snapshot.

  • how to i download a launch the mplayer? what is the command for it? – most venerable sir Jun 5 '18 at 13:48
  • "apt-get install mplayer". I do have "deb deb-multimedia.org stretch main non-free" in my /etc/apt/sources.list. That is "h t t p : / / www.deb-multimedia.org" – Gerard H. Pille Jun 5 '18 at 13:51
  • @mostvenerablesir In future please use a search engine before you ask a live human being to spend their time explaining things to you. google.ca/search?q=mplayer – goldilocks Jun 5 '18 at 13:52
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    only root can add new packages to your system. You need to be "system administrator". "stretch main non-free" indicates what debian version and kind of packages I want to retrieve from deb-multimedia.org. Also, if you're that new, mplayer is not the right program for you, you should find an equivalent with a graphical interface. Perhaps the 3B can handle VLC. – Gerard H. Pille Jun 5 '18 at 14:07
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    Better have a look at a couple of these articles: duckduckgo.com/?q=mplayer+watch+webcam&t=ftas&ia=web and if you're not satisfied with the result, show exactly what command you tried. Just "mplayer" on its own won't do. – Gerard H. Pille Jun 5 '18 at 16:48

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