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• Best Codec and Pixel Formats to use in FFMPEG Pipeline

  19 décembre 2022, par user20623229

  I have created an FFMPEG Pipeline to stream video frames to an RTSP server. The frames are RGB frames with 3 dimensions. My pipeline command is as follows :

  


  openPipeLine = _popen("ffmpeg -f rawvideo -r 30 -video_size 720x1280 -pixel_format bgr24 -i pipe: -vcodec libx264 -crf 24 -pix_fmt yuv420p -f rtsp rtsp://localHost:8554/mystream", "w");


  


  I can barely make out the picture when I connect to the server via VLC Media. The colors seem scrambled. I've attached a sample image and the output on the server.

  


  Are there any recommended Codec's that I can use to solve this ? Perhaps the pixel format should be changed. I'm currently using a Codec and pixel format that I found online without knowing if these are the best options.
original frame
server output

  


  Thank you very much.

  


• FFmpeg can't access file in Dropbox on Ubuntu 12.04

  30 juin 2015, par afterglowlee

  I have installed FFmpeg on Ubuntu 12.04. When I use ffmpeg -i command to check some video file online, it works :

  ffmpeg -i http://techslides.com/demos/sample-videos/small.mp4

  However, when I check a public file hosted in my Dropbox it gives ’No such file or directory error’ :

  ffmpeg -i https://dl.dropboxusercontent.com/u/51617581/bigbuck.webm

  and the error is :

  https://dl.dropboxusercontent.com/u/51617581/bigbuck.webm : No such
  file or directory

  and here is the version info of the ffmpeg installation :

  ffmpeg version 0.8.17-4:0.8.17-0ubuntu0.12.04.1, Copyright (c)
  2000-2014 the Libav developers built on Mar 16 2015 13:26:50 with
  gcc 4.6.3

  I have also tried both files on my Mac 10.10 laptop, and both of them work fine. Could anyone suggest where is the problem ? Many thanks.

• fluent ffmpeg => how to trim and concate parts of video into one output file without writing many output files. Make a most efficient solution

  30 avril 2024, par Shreyansh Gupta

  I'm currently working on a online video website and i need to make a quick preview of videos using random timestamps and duration of the video.

  


  Suppose the video is of 15 min then i want to cut out some parts like ->

  


  1. from 00:00:40 take out next 2s 
2. from 00:01:20 take out next 2s 
3. ... and so on until the new video becomes 15s


  


  How can i do this with fluent-ffmpeg in the nodejs project

  


  Can i get the most efficient way of doing this without writing many output files and then concating them separately and removing then later

  


  Only concating the trimmed videos in one output file and save when it is done.

  


  I also came through a solution that uses complex filters but i don't know how to use it

  


     ffmpeg("video.mp4")
  .complexFilter([
    ....// some filters here

  ])
  .on('end',  function () {
    console.log('files have been merged and saved.')
  })
  .on('error',function (err){
    console.log(err)
  }
  .saveToFile("output.mp4")```