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• Send 2 different feeds to ffserver from ffmpeg

  30 avril 2015, par Niklas Tampier Holmgren

  I’m currently working in a project where I have to stream 2 webcams streams from a computer to another through a TCP connection, I can stream 1 without problem :

  using

  ffserver.conf :

              HTTPPort 8090
  
              HTTPBindAddress 0.0.0.0
  
              MaxClients 40
  
              MaxBandwidth 30000
  
  
  
              CustomLog -
  
              NoDaemon
  
  
  
              <stream>
  
              Format status
  
              ACL allow localhost
  
              ACL allow 192.168.0.0 192.168.255.255
  
              </stream>
  
  
  
             #feed for camera 1
  
             <feed>
  
             File /tmp/webcam1.ffm
  
             FileMaxSize 100M
  
             </feed>
  
  
  
             #feed for camera 2
  
             <feed>
  
             File /tmp/webcam2.ffm
  
             FileMaxSize 100M
  
             </feed>
  
  
  
            #stream for feed 1
  
            <stream>
  
            Feed webcam1.ffm
  
            Format mjpeg
  
            VideoSize 1280x720
  
            VideoFrameRate 30
  
            Preroll 0
  
            NoAudio
  
            Strict -1
  
            </stream>
  
  
  
            #stream for feed2
  
            <stream>
  
            Feed webcam2.ffm
  
            Format mjpeg
  
            VideoSize 1280x720
  
            VideoFrameRate 30
  
            Preroll 0
  
            NoAudio
  
            Strict -1
  
            </stream>

  command to run ffserver :

            ffserver /etc/ffserver.conf

  command to feed ffserver :

           ffmpeg -v 2 -r 20 -f video4linux2 -i /dev/video0 http://localhost/webcam1.ffm

  and it works perfect, but when I try to run the other feed :

           ffmpeg -v 2 -r 20 -f video4linux2 -i /dev/video1 http://localhost/webcam2.ffm

  I can see just the second stream and the first one do not work anymore.
  some idea ?

• FFMPEG make adjustment on first frame

  30 avril 2022, par iDeveloper

  I am using FFMPEG library to convert images to video file in my software program.

  


  Here frameRate is 1 or 5. So, I need a dynamic image based on time for first 5 seconds. So, in the images folder if there is more than 10 images then I set frameRate as 5 for else frame rate is 1

  


  Algorithm :

  


  let startNumber: Int
let blackFrame  = self.sourceURL.appendingPathComponent("TIME_STAMP.jpg", isDirectory: false)
    
    if FileManager.default.fileExists(atPath: blackFrame.path){
       
        let data = try! Data(contentsOf: blackFrame)
        
        try? FileManager.default.removeItem(at: blackFrame)

        if frameRate == "1"{
            
            startNumber = 20
            
            for i in 20...24{
                
                let url = sourceURL.appendingPathComponent("img\(i).jpg", isDirectory: false)
                try? data.write(to: url)
            }
            
        }else{
            
            startNumber = 0
            for i in 0...24{
                
                let url = sourceURL.appendingPathComponent("img\(i).jpg", isDirectory: false)
                try? data.write(to: url)
            }
        }
        
    }else{
        
        startNumber = 25
    }
 
    let arguments: [String] = [
        "-y",
        "-framerate", frameRate,
        "-start_number",  "\(startNumber)",
        "-i", "\(sourceURL.path)/img%0d.jpg",
        "-c:v", "libx264",
        "-crf", "28",
        outputURL.path
    ]


  


  This is how I am constructing the arguments. It's working perfect on fast systems. but for slow systems the creation of custom time image takes time than the FFMPEG execution. So, the output video file is mixed of various frames instead of 1....N ;

  


  So, I don't want to create the 5 or 25 images each time. Instead can am I able to set frame rate for first image only ? or is there any alternative ?

  


  Thank you !

  


• How can I automate the subtitle adding process in FFMPEG ?

  23 septembre 2022, par Phoeniqz

  The situation is, that I have 10 MP4 videos and a folder for each of them that has the same name as its video. In each of folders there are around 30 SRT files I need to add. I would like to automate this. I mean a script that would add each SRT file to the video and add the correct handler for the subtitles, so that the subtitle would appear as "English" instead of "Subtitle #12" in a movie player. I made a python script ; it's far from perfect and it does not add the handlers correctly.

  


  The name of each SRT file is something like "20_Hebrew.srt"

  


  

import os
file_dir = r"Path/to/my/files"
sub_dir = file_dir + "/Subs"


def add_sub(file, file_name):
    cmd = f"ffmpeg -i '{file}' "
    sub_list = []

    no_extension = file_name.replace(".mp4", "")

    for sub_name in os.listdir(sub_dir + f"/{no_extension}"):
        s = os.path.join(sub_dir + f"/{no_extension}", sub_name)

        if os.path.isfile(s):
            cmd += f"-i '{s}' "
            sub_list.append(s)
    
    cmd += "-map 0:v -map 0:a "

    for i, v in enumerate(sub_list):
        cmd += f"-map {i+1} "
    
    cmd += "-c:v copy -c:a copy "

    for i, v in enumerate(sub_list):
        sub_lang = v.replace(".srt", "")
        index = sub_lang.index(f"/Subs/")
        sub_lang = sub_lang[index:]
        index = sub_lang.index("_")
        sub_lang = sub_lang[index+1:]

        cmd += f"-c:s:{i} mov_text -metadata:s:s:{i} language='{sub_lang}' -metadata:s:s:{i} handler='{sub_lang}' "

    cmd += f"'{file}_OUTP.mp4'"

    os.system(cmd)

for file_name in os.listdir(file_dir):
    f = os.path.join(file_dir, file_name)

    if os.path.isfile(f):
        add_sub(f, file_name)