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• How to fix "Non-monotonous DTS in output stream 0:1" when trying to convert a m3u8 file into a mp4 using ffmpeg

  23 mars 2019, par Alessandro Autiero

  I’m currently coding a desktop util that downloads Twich Clips if they meet some requirements. As the twitch api gives as a response a m3u8 file, I have to convert it into a mp4. To do with I’m executing a cmd command through my Java application using the ProcessBuilder API built into Java. The command works fine, but sometimes I get a buggy video that has broken frames and audio. Here’s my code :

  public static void convertFile(File input, File output) {
  
      String command = "ffmpeg -protocol_whitelist file,http,https,tcp,tls,crypto -vsync 2 -i \"" + input.getAbsolutePath() + "\" -c copy " + "\"" + output.getAbsolutePath() + "\"";
  
      System.out.println("______________________________________________________");
  
      System.out.println("Converting file...");
  
      System.out.println("Using as input " + input.getAbsolutePath());
  
      System.out.println("Using as output " + output.getAbsolutePath());
  
      System.out.println("Using as command: " + command);
  
      System.out.println("______________________________________________________");
  
      setHasDone(false);
  
  
  
      ProcessBuilder pb = new ProcessBuilder();
  
      pb.command(command.split(" "));
  
  
  
      pb.redirectOutput(ProcessBuilder.Redirect.INHERIT);
  
      pb.redirectError(ProcessBuilder.Redirect.INHERIT);
  
  
  
      Process process;
  
      try {
  
          process = pb.start();
  
      }catch (IOException e){
  
          e.printStackTrace();
  
          return;
  
      }
  
  
  
      while (process.isAlive()){
  
          setHasDone(false);
  
      }
  
  
  
      setHasDone(true);
  
  }

  Example of broken video :
  https://youtu.be/FfFvStNl-9o

  When uploaded to youtube lot’s of the video bugs are not present, not really know why, but at the end you can clearly see what I’m talking about. Am I using ffmepg wrong ?

  I posted this as none of the 1000 answers on similar posts helped me.

• Why can't I connect OBS to my transcoding server ?

  3 février 2019, par toastedDeli

  I’m trying to write a server that will take incoming RTMP video and transcode to HLS for live streaming. I’m using ffmpeg on my server for the transcoding. Here is the ffmpeg command I am running :

  ffmpeg -i rtmp://127.0.0.1:1935/test -c:v libx264 -x264opts keyint=120:no-scenecut -s 1280x720 -r 60 -b:v 5M -profile:v main -preset veryfast -c:a libfdk_aac -sws_flags bilinear -hls_list_size 6 output.m3u8

  I’m confident that this is the correct usage of ffmpeg for transcoding because I read about it here.

  When I run my server and try to connect to it using OBS (Open Broadcaster Software) I get an error from OBS saying failed to connect to server. I get this error from ffmpeg :

  RTMP_Connect0, failed to connect socket. 111 (Connection refused)
  rtmp ://127.0.0.1:1935/test : Unknown error occurred

  Here is a capture of the packets sent between the applications.

  

  Here are the OBS setting I’m using to stream to my server :
  

  Edit : When I remove /test from the url in my ffmpeg command and in the OBS settings window I get this :
  

• Opencv VideoCapture always returns false on Heroku

  27 juin 2022, par Dacian Mujdar

  I'm using the following code to open a video stream :

  


  import cv2
video = cv2.VideoCapture()
video.open("some_m3u8_link")
success, image = video.read()


  


  However, even if the code works as intended locally, on Heroku success is always false.

  


  I'm using cedar-14 stack with the following buildpacks :

  


  


  heroku/python

  


  https://github.com/jonathanong/heroku-buildpack-ffmpeg-latest.git

  


  


  (I tried several buildpack options for ffmpeg)

  


  Running ffmpeg --version on heroku instance will return ffmpeg version 4.0-static https://johnvansickle.com/ffmpeg/

  


  Is there any setting/configuration I missed in order to make it work on deployment ? Thank you !

  


  Later edit : I tried several links for "some_m3u8_link" including from twitch and other streaming services (including traffic streaming li
An example for reproducing :

  


  python -c "import cv2; video=cv2.VideoCapture(); video.open('https://hddn01.skylinewebcams.com/live.m3u8?a=5tm6kfqrhqbpblan9j5d4bmua4'); success, image = video.read(); print(success)"


  


  Returns True on local machine and False on Heroku.

  


  (the link is taken from here)