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Prochaine révision 		Révision précédente
linux:webcam [2011/01/03 16:58]
jce créée 		linux:webcam [2021/04/11 13:50] (Version actuelle)
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-====== liens ======+====== Jouer avec une webcam ======
  
  
-  * [[ http://www.commandlinefu.com | c'est fun ]] +===== Capture de webcam avec visualisation =====
-  * [[ http://blog.nicolargo.com/2010/04/myscreencast-comment-faire-du-screencast-avec-gstreamer.html | screencast ]] +
-  * [[ http://www.twm-kd.com/linux/webcam-and-linux-gstreamer-tutorial | mais surtout]] +
- +
-====== il a tout bon ======+
  
  
 Now let’s get busy building a pipeline! Now let’s get busy building a pipeline!
  
-$ gst-launch v4l2src device=/dev/video0 ! \ +  $ gst-launch v4l2src device=/dev/video0 ! \ 
-  'video/x-raw-yuv,width=640,height=480,framerate=30/1' ! \ +    'video/x-raw-yuv,width=640,height=480,framerate=30/1' ! \ 
-  xvimagesink+    xvimagesink
  
 GStreamer has a simple pipeline workflow. First you define the source, then GStreamer has a simple pipeline workflow. First you define the source, then
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 Now that you have a live feed on your screen you can try putting it in a file. Now that you have a live feed on your screen you can try putting it in a file.
  
-$ gst-launch v4l2src ! 'video/x-raw-yuv,width=640,height=480,framerate=30/1' ! \ +  $ gst-launch v4l2src ! 'video/x-raw-yuv,width=640,height=480,framerate=30/1' ! \ 
-  queue ! videorate ! 'video/x-raw-yuv,framerate=30/1' ! theoraenc ! \ +    queue ! videorate ! 'video/x-raw-yuv,framerate=30/1' ! theoraenc ! \ 
-  queue ! oggmux ! filesink location=me_funny_dancing.ogg+    queue ! oggmux ! filesink location=me_funny_dancing.ogg
  
 What is different this time? First there is queue which provides some buffer What is different this time? First there is queue which provides some buffer
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 filesink which writes all the data to a file. Try playing it! filesink which writes all the data to a file. Try playing it!
  
-$ mplayer me_funny_dancing.ogg+  $ mplayer me_funny_dancing.ogg
  
 See yourself doing a funny dance. But oh, noes! The quality is kind of bad and See yourself doing a funny dance. But oh, noes! The quality is kind of bad and
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 a time. First the recording feedback. a time. First the recording feedback.
  
-$ gst-launch v4l2src ! 'video/x-raw-yuv,width=640,height=480,framerate=30/1' ! \ +  $ gst-launch v4l2src ! 'video/x-raw-yuv,width=640,height=480,framerate=30/1' ! \ 
-  tee name=t_vid ! queue ! xvimagesink sync=false t_vid. ! queue ! videorate ! \ +    tee name=t_vid ! queue ! xvimagesink sync=false t_vid. ! queue ! videorate ! \ 
-  'video/x-raw-yuv,framerate=30/1' ! theoraenc ! queue ! oggmux ! \ +    'video/x-raw-yuv,framerate=30/1' ! theoraenc ! queue ! oggmux ! \ 
-  filesink location=me_funny_dancing.ogg+    filesink location=me_funny_dancing.ogg
  
 Yes, this pipeline is getting more and more complicated. With tee you can Yes, this pipeline is getting more and more complicated. With tee you can
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 complicated pipeline. complicated pipeline.
  
-$ gst-launch v4l2src ! 'video/x-raw-yuv,width=640,height=480,framerate=30/1' ! \ +  $ gst-launch v4l2src ! 'video/x-raw-yuv,width=640,height=480,framerate=30/1' ! \ 
-  tee name=t_vid ! queue ! xvimagesink sync=false t_vid. ! queue ! videorate ! \ +    tee name=t_vid ! queue ! xvimagesink sync=false t_vid. ! queue ! videorate ! \ 
-  video/x-raw-yuv,framerate=30/1 ! theoraenc ! queue ! mux. \ +    video/x-raw-yuv,framerate=30/1 ! theoraenc ! queue ! mux. \ 
-  alsasrc device=hw:1,0 ! audio/x-raw-int,rate=48000,channels=2,depth=16 ! \ +    alsasrc device=hw:1,0 ! audio/x-raw-int,rate=48000,channels=2,depth=16 ! \ 
-  queue ! audioconvert ! queue ! vorbisenc ! queue ! mux. \ +    queue ! audioconvert ! queue ! vorbisenc ! queue ! mux. \ 
-  oggmux name=mux ! filesink location=me_funny_dancing.ogg+   oggmux name=mux ! filesink location=me_funny_dancing.ogg
  
 Are your eyes bleeding? You’re not finished yet, so get ready for more. What Are your eyes bleeding? You’re not finished yet, so get ready for more. What
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 avec pulseaudio :  avec pulseaudio : 
  
-pulsesrc device="alsa_input.usb-046d_081b_4FBFC690-02.analog-mono"+  pulsesrc device="alsa_input.usb-046d_081b_4FBFC690-02.analog-mono"
  
 (voir http://www.oz9aec.net/index.php/gstreamer/365-pulseaudio-device-names) (voir http://www.oz9aec.net/index.php/gstreamer/365-pulseaudio-device-names)
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 need something else, something more raw! Try this: need something else, something more raw! Try this:
  
-$ gst-launch v4l2src ! 'video/x-raw-yuv,width=640,height=480,framerate=30/1' ! \ +  $ gst-launch v4l2src ! 'video/x-raw-yuv,width=640,height=480,framerate=30/1' ! \ 
-  tee name=t_vid ! queue ! videoflip method=horizontal-flip ! \ +    tee name=t_vid ! queue ! videoflip method=horizontal-flip ! \ 
-  xvimagesink sync=false t_vid. ! queue ! \ +    xvimagesink sync=false t_vid. ! queue ! \ 
-  videorate ! 'video/x-raw-yuv,framerate=30/1' ! queue ! mux. \ +    videorate ! 'video/x-raw-yuv,framerate=30/1' ! queue ! mux. \ 
-  alsasrc device=hw:1,0 ! audio/x-raw-int,rate=48000,channels=2,depth=16 ! queue ! \ +    alsasrc device=hw:1,0 ! audio/x-raw-int,rate=48000,channels=2,depth=16 ! queue ! \ 
-  audioconvert ! queue ! mux. avimux name=mux ! \ +    audioconvert ! queue ! mux. avimux name=mux ! \ 
-  filesink location=me_dancing_funny.avi+    filesink location=me_dancing_funny.avi
  
 Don’t be surprised if you see your mirrored image on the screen. You should, Don’t be surprised if you see your mirrored image on the screen. You should,
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 the fly. You need to record raw video and then convert to H.264. Here’s how: the fly. You need to record raw video and then convert to H.264. Here’s how:
  
-$ gst-launch filesrc location=me_funny_dancing.avi ! \ +  $ gst-launch filesrc location=me_funny_dancing.avi ! \ 
-  decodebin name=decode decode. ! queue ! x264enc ! mp4mux name=mux ! \ +    decodebin name=decode decode. ! queue ! x264enc ! mp4mux name=mux ! \ 
-  filesink location=me_funny_dancing.mp4 decode. ! \ +    filesink location=me_funny_dancing.mp4 decode. ! \ 
-  queue ! audioconvert ! faac ! mux.+    queue ! audioconvert ! faac ! mux.
  
 (je n'ai pas de plugin gstreamer pour le "muxage" en mp4 => j'utilise mencoder : (je n'ai pas de plugin gstreamer pour le "muxage" en mp4 => j'utilise mencoder :
-mencoder -profile mpeg4 me_dancing_funny.avi -o me_dancing_funny.mp4)+  mencoder -profile mpeg4 me_dancing_funny.avi -o me_dancing_funny.mp4)
  
 This time you need to specify a different source. It needs to be the file This time you need to specify a different source. It needs to be the file
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 Use gst-inspect to check which inputs and outputs are acceptable by a certain element. Use gst-inspect to check which inputs and outputs are acceptable by a certain element.
  
-$ gst-inspect filesink +  $ gst-inspect filesink 
-$ gst-inspect audioconvert+  $ gst-inspect audioconvert
  
 I usually run arecord -l to get list of devices. I usually run arecord -l to get list of devices.
  
 +===== Trouver les périphériques avec pulseaudio =====
  
-====== le script qui fait tout : ======+  pactl list 
 + 
 +This will generate a lot of text and you will probably want to pipe this through less. The interesting modules are those of type "Source #" for input and "Sink #" for playback. The pulseaudio device name is then the weird text string shown under the "Name" parameter. The [[ http://pulseaudio.org/wiki/FAQ | Pulseaudio FAQ]] has some neat tricks for [[ http://pulseaudio.org/wiki/FAQ#HowdoIrecordstuff | filtering the device ]] names out: 
 + 
 +voir http://www.oz9aec.net/index.php/gstreamer/365-pulseaudio-device-names 
 + 
 + 
 +===== Le script qui fait tout =====
    
  
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   # supprimer le fichier non compressé   # supprimer le fichier non compressé
   rm -f $nomFichier.avi   rm -f $nomFichier.avi
 +
 +=====  Ressources  =====
 +
 +
 +  * Utiliser gstreamer en [[ http://www.commandlinefu.com | ligne de commande ]] pour produire divers effets.
 +  * Faire une  [[ http://blog.nicolargo.com/2010/04/myscreencast-comment-faire-du-screencast-avec-gstreamer.html | capture vidéo ]] de son écran.
 +  * Capture de webcam avec visualisation :  [[ http://www.twm-kd.com/linux/webcam-and-linux-gstreamer-tutorial | exemples progressifs]] et fonctionnels (c'est de là que vient le //tutoriel// ci-dessus).
 +
  
linux/webcam.1294070295.txt.gz · Dernière modification: 2021/04/11 13:41 (modification externe)

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