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• mplayer or ffmpeg to display video that is beeing pushed to the player ?

  18 décembre 2020, par Sebastian Heyn

  I am planning an application, where an outside video camera should be displayed using mplayer (or any other lightweight video player).

  


  However, instead of connecting the mplayer to the camera server (ffmpeg or something), I want the camera to push the video to the player.

  


  The camera will be on an unstable network, and it will be natted so I cannot access without using a VPN or ssh tunnel. Those tunnels will consume CPU power, bandwidth and connection establish time.

  


  Ideally, the last received frame will be displayed, until the next frame is received, without closing the window.

  


  Does anyone know a way to achieve this using existing software ? BTW : The camera will be connected to a raspberry or simillar.

  


• Bash script : Cycle script until ffmpeg command restarts successfully

  13 août 2023, par Bellacoda

  I have a IP Camera and the recordings are saved with ffmpeg RTSP into a raspberry pi.

  


  Sometimes, when the electricity shuts off and comes back on, the raspberry boots faster than the IP Camera and the ffmpeg command (saved on a crontab to run every reboot) fails to execute because it can't reach the IP Camera (that is still turning on).

  


  I tried to put a sleep command before the command but that doesn't work either.

  


  It also happened that when the IP Camera reboots, the raspberry closes the command, but when the camera comes back online, I have to manually lauch the command.

  


  Is there a way to make a script that waits to run the ffmpeg command until the camera is fully online (I assume with the $ ? variable for command exit status), and to wait to restart the ffmpeg command when the camera reboots ?

  


  The setup I have now is a crontab :
SHELL=/bin/bash
@reboot sleep 120s ; sudo ffmpeg ...

  


• Getting less duration while recording a video for multi cameras simultaneously [closed]

  6 janvier 2024, par Pratik Gajera

  I am working on Quicktel SC686 module which has support 3 cameras. Currently, I have developed camera application using Gstreamer framework for recording a video for 2 cameras simultaneously. But I am suffering from duration issue of the video while two cameras are running simultaneously.

  


  The following cases are tested in the board using my Gstreamer demo application. PFA my demo app source code for camera 1 and camera 2.

  


  case 1. Record a video for 2 mins for single camera 1 using demo app,

  


  Result : Camera 1 video's duration : 120 sec

  


  case 2. Record a video for 2 mins for single camera 2 using demo app,

  


  Result : Camera 2 video's duration : 120

  


  case 3. Record a video for 2 mins for multi camera (camera 1 and 2) simultaneously.

  


  Result : Camera 1 video's duration : 101 sec
Camera 2 video's duration : 100 sec

  


  We analyzed 1st, 2nd and 3rd case, we got video duration inconsistent for camera 1 and 2 in 3rd case. Less duration issue is appeared while multi cameras are running simultaneously.

  


  Could you please point out the issue what i am missing here ?

  


  We can use below logic to find out duration of the h265 video.

  


  $ ffprobe -v error -select_streams v:0 -show_packets -show_entries packet=duration_time -of default=noprint_wrappers=1:nokey=1 in.mp4 > durations.txt

  


  Duration = Sum each line of the duration.txt

  


  Thanks in advance !