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• stream usb webcam via http using vlc without transcoding using mjpeg signal from webcam

  10 novembre 2020, par Peter Nußreiner

  I wanna stream my (Microsoft live) USB webcam using vlc from a raspberry.
While it works perfectely fine with transcoding my raspberry does not have enough power.

  


  So I checked the output formats of my webcam using :

  


  ffmpeg -f v4l2 -list_formats all -i /dev/video0


  


  wich gives me the following output :

  


  [video4linux2,v4l2 @ 0x559d5aee36c0] Raw       :     yuyv422 :           YUYV 4:2:2 : 640x480 1280x720 960x544 800x448 640x360 424x240 352x288 320x240 800x600 176x144 160x120 1280x800
[video4linux2,v4l2 @ 0x559d5aee36c0] Compressed:       mjpeg :          Motion-JPEG : 640x480 1280x720 960x544 800x448 640x360 800x600 416x240 352x288 176x144 320x240 160x120
/dev/video0: Immediate exit requested


  


  when running my streaming command :

  


  cvlc v4l2:///dev/video0:chroma=h264:width=1280:height=720 --sout '#standard{access=http,mux=ts,dst=192.168.178.27:8080,name=stream,mime=video/ts}' -vvv


  


  I get the following error :

  


  mux_ts mux warning: rejecting stream with unsupported codec YUY2
main mux error: cannot add this stream
main decoder error: cannot create packetizer output (YUY2)


  


  along with many other lines of information.
As far as I can interpret the error, vlc wants to use the YUY2 RAW signal of my webcam.
Is there any way I can force vlc to use the mjpg output of my camera ?

  


  I've already tried to use 'chroma=mjpg' without success.
Transcoding is not an alternative as my raspi has by far not enough power.

  


  I've also read about using ffmpeg for streaming, maybe someone has an alternative solution since I'm very new to the whole topic of websites and stuff

  


  It will (or should) be used as a live webcam for a windsurfing spot.
Therefore I need a fluent video with at least 10fps to judge the situation. A delay of a minute or so is no problem.
The basic idea was to stream the video to a webserver and embed the image in a website. I've got good internet connection at the spot.

  


  But for now I want to try it locally on my pc.

  


• Server side video merging with FFmpeg through oline form

  1er août 2017, par San007

  I have a difficult problem and not enough knowledge to solve it, therefore I am hoping you guys can give me some advice or redirect me to a professional or professional software which can solve my problem.

  I want something fairly simple but I simply do not know how to begin. I Googled extensively but didnt find any related topics.

  What do I want ?
  I want an online form on my website where people can select different options, which are videos, for example
  Question 1
  1 (1.mp4) / 2 (2.mp4) / 3 (3.mp4)
  Question 2
  X (X.mp4) / Y (Y.mp4) / Z (Z.mp4)
  Question 3
  Email adres :
  Generate

  When the visitor clicks the generator button it should merge the video’s the customer has selected. e.g. 1 and X will result in one video file of 1.mp4 and X.mp4 merged. The system should then after succesfully merging the videos send a download link to the users e-mail adres and ideally delete the video from the server afterwards.

  I know I have not done a whole lot of research because my knowledge simply is not enough to create my own solution, but I hope you guys can send me in the right direction, I do not mind any commercial solution.

• Evolution #3969 (Nouveau) : _PROXY_HTTPS_VIA_CONNECT par défaut ?

  29 juin 2017, par guytarr °

  https://core.spip.net/projects/spip/repository/revisions/21363
  Par soucis de compatibilité il ne sera pris en charge qu’en cas de
  ```define(’_PROXY_HTTPS_VIA_CONNECT’,true) ;```
  dans le fichier mes_options.php. A voir si il faut rendre cette fonctionnalité activable par l’interface et/ou si elle doit être celle active par défaut.

  cf. le mail de Willy Destrez | Académie d’Amiens sur spip-zone

  Bonjour,
  après analyse du serveur récalcitrant, il manquait une déclaration dans le fichier mes_options.php
  define(’_PROXY_HTTPS_VIA_CONNECT’,true) ;
  
  Le serveur autonome est désormais capable d’ajouter un dépôt, de trouver les révisions dans Couteau Suisse et de faire fonctionner le spip_loader.