Recherche avancée

Sur d’autres sites (10882)

• How to switch between 2 stream inputs after a set duration using ffmpeg ?

  6 février 2021, par zlyfer

  I am tinkering with my two Raspberry Pis and would like to do the following :

  



  Both Pis record via a camera and stream it via cvlc to the network. Then one of them uses both streams to make a single stream wich alternates between both sources every 30 seconds.
My setup is as below :

  



  Pi 3 (192.168.0.158) and Pi 4 (192.168.0.87) both use the following command to stream the camera feed to my local network :

  



  raspivid -o - -t 0 -vf -hf -fps 30 -b 6000000 | cvlc -vvv stream:///dev/stdin --sout '#standard{access=http,mux=ts,dst=:8090}' :demux=h264


  



  The Pi 4 then uses

  



  ffmpeg -protocol_whitelist file,http,https,tcp,tls,crypto -f concat -safe 0 -i stream_list.txt -c copy output.mp4


  



  with content of stream_list.txt being :

  



  file http:\/\/192.168.0.87:8090
duration 00:00:02.00
file http:\/\/192.168.0.158:8090
duration 00:00:02.00


  



  I use output.mp4 as test, this will be a twitch server or somewhat. The current duration is 2 seconds just for testing as well. And I will add a loop -1 to keep switching. My problem is that the process doesnt stop after 4 seconds. It keeps "recording" forever until I CTRL+C and then output.mp4 only contains the camera feed of the first mentioned stream in the stream_list.txt. It doesn't stop after 2 seconds switches to the other stream and then stops after another 2 seconds as I expected.

  



  Is there something that I am essentially doing wrong or am I at least somewhat on the right way ?

  


• FFMPEG Compilation and Video Thumbnail Issues [on hold]

  2 janvier 2016, par P. Paul

  I have compiled FFMPEg on a Linux, Centos machine according to the guide in here https://trac.ffmpeg.org/wiki/CompilationGuide/Ubuntu , and the auto video thumbnail creation command in here https://trac.ffmpeg.org/wiki/Create%20a%20thumbnail%20image%20every%20X%20seconds%20of%20the%20video

  The problems are...

  1- When I use ffmpeg or ffmpeg -version command to check if ffmpeg has been installed I get the error message, "Command not found". But when I check for ffmpeg directory "~/ffmpeg_sources" is found and the machine says, "is a directory".

  2- Also, I did a test and upload video to the site to see if the video’s thumbnail will be automatically generated, but it didn’t show any thumbnail.

  Any help would be greatly appreciated.

  Thanks in advance !

• EM : ajouter la prise en charge de l’extension epub dans SPIP

  19 octobre 2011

  Ajouter le format epub afin de pouvoir le mettre en ligne même si dans l’immédiat on ne sait pas encore le traiter (plugin annexe à faire) ...

  CF pour le format : http://fr.wikipedia.org/wiki/EPUB_%...