Recherche avancée

Sur d’autres sites (5164)

• ffmpeg - convert image sequence to video with reversed order

  8 avril 2017, par 0__

  Looking at the docs, it is not apparent to me whether ffmpeg would allow me to convert an image sequence to a video in reverse order, for example using this sequence :

  frame-1000.jpg
  
  frame-999.jpg
  
  frame-998.jpg
  
  ...
  
  frame-1.jpg

  Is it possible to give a "step direction" for the frame indices ?

• Call system package with Go on App Engine Standard

  8 novembre 2019, par reidreid46

  I’m trying to use FFmpeg in a Go application thats running on Google App Engine Standard. I can get this to run locally, when I point to a local instance of the FFmpeg binary using exec.Command()

  cmd := exec.Command(
  
      "/Users/justin/Desktop/conversion/ffmpeg", // this won't work on a remote server
  
      "-i", "pipe:0",
  
      "-ac", "1",
  
      "-codec:a", "libmp3lame",
  
      "-b:a", "48k",
  
      "-ar", "24000",
  
      "-f", "mp3",
  
      "pipe:1",
  
    )
  
  
  
    cmd.Stdin = bytes.NewReader(synthResp.AudioContent)
  
  
  
    var output bytes.Buffer
  
    cmd.Stdout = &output
  
    err = cmd.Run()

  Obviously, this won’t work when I deploy the application, so I need a way to point to a hosted version of the FFmpeg binary. It seems ffmpeg is a system package for the go1.11 App Engine Standard environment.

  What are "System packages" and how do I use them ?
  When I look for documentation, I find a lot of documentation on apt-get, and no documentation on how to use them, App Engine or otherwise. Do I need to install it, or should it already be part of the container(?) that App Engine is running ?

  Do I call it, like I’d call other executables ? If so, that I’d expect this to work, but it doesn’t

  cmd := exec.Command(
  
      "ffmpeg", // <------ what should this be?
  
      "-i", "pipe:0",
  
      "-ac", "1",
  
      "-codec:a", "libmp3lame",
  
      "-b:a", "48k",
  
      "-ar", "24000",
  
      "-f", "mp3",
  
      "pipe:1",
  
    )
  
  
  
    cmd.Stdin = bytes.NewReader(synthResp.AudioContent)
  
  
  
    var output bytes.Buffer
  
    cmd.Stdout = &output
  
    err = cmd.Run()

  Logging err, I see exec: "ffmpeg": executable file not found in $PATH

• Is it possible to use ffmpeg in nwjs native addon in linux ?

  16 octobre 2016, par Sergey Yakimov

  I’ve created native addon for encoding video from IDS camera. It work in nodejs but after rebuilding it with nw-gyp it stop working. I checked available encoders and there is none. When nwjs loads addon I think it using ffmpeg which come with nwjs and it have only few decoders compiled in and no encoders. In nwjs docs they only describe how one can enable h264 codec, but if I understand it right it will work only as decoder.

  So is there a way to make addon use system ffmpeg instead of that what come with nwjs or at least rebuild ffmpeg used in nwjs to include encoders in it ?