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• FFMPEG no audio in final output [migrated]

  16 juin 2015, par Maverick

  I have the following FFMPEG command working.

  ffmpeg -y -i slide.mp4 -f lavfi -i "color=c=black:s=1920x1080:r=25:d=1" -filter_complex "[0:v] setpts=PTS-STARTPTS [main]; \
  
   [1:v] trim=end=3,setpts=PTS-STARTPTS [pre]; \
  
   [1:v] trim=end=3,setpts=PTS-STARTPTS [post]; \
  
   [pre][main][post] concat=n=3:v=1:a=0 [out]" -map "[out]" output.mp4

  It appends black frames at the start and end of the video. However, the output file does not contain the audio from the input file.

  Any pointers to the problem will be highly appreciated.

• FFmpeg does not successfully send http request to server

  20 octobre 2019, par e-ly

  I’m trying to output data from ffmpeg to my webserver, but it simply does not work when I use my domain. It works as expected when I use localhost but not when I use my domain.

  I’ve tried multiple things such as changing from a subdomain to a subdirectory using nginx, and like I said— it works when I use localhost but not when I use my domain. When I ran -v trace the logs told me that the connection was successful but the server did not receive anything, yet when I visited the same url in my browser I got a response.

  ffmpeg command :

  '-v', 'trace',                                               
  
  '-f', 'x11grab',
  
  '-s', '720x480',
  
  '-r', '30',
  
  '-i', ':100',
  
  '-an',
  
  '-c:v', 'mpeg1video',
  
  '-q:v', '12',
  
  '-bf', '0',
  
  '-f', 'mpegts',
  
  'http://stream.domain.com/'                                                                                                    

  Nginx rule :

  server {
  
     listen 80;
  
     server_name stream.domain.com;
  
     location / {
  
         proxy_pass http://localhost:9000/;
  
     }
  
  }    

  Nodejs code :

  app.post('/', (req, res) => {
  
      console.log('Post received', req.url, req.ip)
  
      res.sendStatus(200)
  
  })

  I expect the console of the node process to let me know that a post has been received (for debugging purposes)
  Instead, nothing is received.
  However using http://localhost:9000/ instead of http://stream.domain.com/ works as expected

• batch converting in ffmpeg from jgp to gif while changing the resolution

  15 janvier 2018, par zlbooth

  Hi this is my first post - excuse how basic it is !

  I’ve got a line for batch converting jpg to gif in Mac

  for i in *.JPG; do 
  
     ffmpeg -i "$i" "${i%.*}.gif"
  
  done

  This line is from Lord Neckbeard’s answer to this post. How do you convert an entire directory with ffmpeg ?

  I just want to add one more parameter which is batch converting the resolution as well as the file type.
  inputting this doesn’t work :

  for i in *.JPG; do 
  
     ffmpeg -i "$i" -s:v 640x480 "${i%.*}.gif"
  
  done

  Any solutions much appreciated !