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Sur d’autres sites (5950)

  • How to take snapshot with multiple web cameras at the same time using PHP in Centos ?

    13 novembre 2014, par galengodis

    I’m trying to take still photos / snapshots with multiple web cameras at the same time through php / shell_execute.

    This is what I use so I can the cameras in the background.

    shell_exec('ffmpeg -f video4linux2 -s 1280x960 -i /dev/video0 -q:v 0 -b:v 10000k -vcodec mjpeg -vframes 1 /var/www/html/cam1.jpg -y > /dev/null 2>/dev/null &');
    

    
shell_exec('ffmpeg -f video4linux2 -s 1280x960 -i /dev/video1 -q:v 0 -b:v 10000k -vcodec mjpeg -vframes 1 /var/www/html/cam2.jpg -y > /dev/null 2>/dev/null &');

    It outputs only one image from the cameras. If i run them one at a time with the same code everything works. Fyi the "&" at the end makes the php run in background. Read more here about shell_exec background process : Is there a way to use shell_exec without waiting for the command to complete ?

    > [root@localhost ~]# lsusb 
    
> Bus 001 Device 002: ID 8087:8000 Intel Corp.
    
> Bus 002 Device 004: ID 1a40:0201 Terminus Technology Inc. FE 2.1
    
> 7-port Hub Bus 001 Device 001: ID 1d6b:0002 Linux Foundation 2.0 root
    
> hub Bus 002 Device 001: ID 1d6b:0002 Linux Foundation 2.0 root hub Bus
    
> 003 Device 001: ID 1d6b:0003 Linux Foundation 3.0 root hub Bus 002
    
> Device 006: ID 046d:0825 Logitech, Inc. Webcam C270 Bus 002 Device
    
> 005: ID 0c45:6340 Microdia
    
> 
    
> [root@localhost ~]# find /dev/bus/ /dev/bus/ /dev/bus/usb
    
> /dev/bus/usb/003 /dev/bus/usb/003/001 /dev/bus/usb/002
    
> /dev/bus/usb/002/006 /dev/bus/usb/002/005 /dev/bus/usb/002/004
    
> /dev/bus/usb/002/001 /dev/bus/usb/001 /dev/bus/usb/001/002
    
> /dev/bus/usb/001/001

    I’ve tried with altering applications between ffmpeg and streamer. So the problem seems to be USB-related. The both cameras are plugged into a USB-hub (with an external power supply). The cameras are of different brands.

    I’m on Centos 7, 64bit.

  • how to pass arguments to existing process instance in c#

    28 octobre 2013, par Akash Langhani

    I am using ffmpeg and I have start a process and I want to pass an argument to same instance after its start, so how to do this in c sharp any resource. Basically I am using ffmpeg to recored desktop screen and ffmpeg recording can be stop with "q" word.

  • Merge commit ’1982d0cc561912d685a0c2dbe58bc19f50bae231’

    21 juin 2016, par Clément Bœsch
    Merge commit ’1982d0cc561912d685a0c2dbe58bc19f50bae231’

    * commit ’1982d0cc561912d685a0c2dbe58bc19f50bae231’ :
    
  fate : Add test for MTS2/MSS4
    

    The timestamps differ because we use a more appropriate timebase.
    

    Merged-by : Clément Bœsch <clement@stupeflix.com>
    • [DH] tests/fate/microsoft.mak
    • [DH] tests/ref/fate/mts2

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