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• FFmpeg (merge two audio)

  10 septembre 2017, par Ameer Alkateeb

  I have two long audio files. I want to merge cut some part from each video
  and merge both parts in one file.

  In below command the problem there is no audio in the second audio part. It contain the first part and the second is empty.

  What is the problem ?

  ffmpeg -f lavfi -i color=c=black 
  
  -ss 157.824 -t 99.818 
  
  -i "file1.mp4" 
  
  -ss 315.764 -t 50.308 
  
  -i "file2.mp4" 
  
  -s 854x480 
  
  -aspect 1.779167
  
  -r 25 
  
  -c:v libx264 
  
  -b:v 800k 
  
  -c:a aac 
  
  -strict experimental 
  
  -b:a 128k 
  
  -f mp4 
  
  -t 150.126 -async 1 
  
  -y "output.mp4"

• ffmpeg convert HLS to RTSP

  11 mai 2022, par Alexander Ström

  I have a HLS stream that needs to be converted to RTSP but I’m not sure how to do it.

  


  Im trying to use this command :

  


  ffmpeg -re -stream_loop -1 -i http://ip:8123/api/hls/fa8a2f/master\_playlist.m3u8 -f rtsp rtsp://localhost:8554/test123


  


  This is some of my errors :

  


  \[http @ 0x56325ba50380\] HTTP error 404 Not Found

\[hls @ 0x56325ba41000\] Failed to open segment 73 of playlist 0

\[http @ 0x56325ba49400\] Opening 'http://ip:8123/api/hls/fa06626345c0c37a924cf83fe6fff1639c447ba0abe259c94604c77fb5228a2f/playlist.m3u8' for reading

\[hls @ 0x56325ba41000\] Skip ('#EXT-X-VERSION:6')

\[hls @ 0x56325ba41000\] Skip ('#EXT-X-INDEPENDENT-SEGMENTS')

\[hls @ 0x56325ba41000\] Skip ('#EXT-X-DISCONTINUITY-SEQUENCE:0')

\[hls @ 0x56325ba41000\] Skip ('#EXT-X-PART-INF:PART-TARGET=1.000')

\[hls @ 0x56325ba41000\] Skip ('#EXT-X-SERVER-CONTROL:CAN-BLOCK-RELOAD=YES,PART-HOLD-BACK=2.000')

\[hls @ 0x56325ba41000\] Skip ('#EXT-X-START:TIME-OFFSET=-2.000,PRECISE=YES')

\[hls @ 0x56325ba41000\] Skip ('#EXT-X-PART:DURATION=0.950,URI="./segment/71.0.m4s",INDEPENDENT=YES')

\[hls @ 0x56325ba41000\] Skip ('#EXT-X-PART:DURATION=0.900,URI="./segment/71.1.m4s"')

\[hls @ 0x56325ba41000\] Skip ('#EXT-X-PART:DURATION=0.949,URI="./segment/71.2.m4s"')


  


  Any idea ?

  


  Im using a rtsp proxy and it works with other streams.

  


• Xamarin Mac FFmpeg launch path not accessible

  25 mars 2024, par Tecnopresley

  I have a Xamarin Forms project with Mac support and I am trying to implement FFmpeg, so I have downloaded the Static build from its official page and added it as in the resources folder of the Mac project with the build action in Content, then I have created a service that will basically remove the audio from a video that I indicate in a path with a FFmpeg command, to do the service I have based on the following answer and I have adapted it to C # :
https://stackoverflow.com/a/37422688/8496520

  


  The problem is that when I try to execute the command I get the following error :

  


  "NSInvalidArgumentException: launch path not accessible"


  


  And I can't find out why this happens, I use the following code in the service (The error occurs when calling the Launch () method of the NSTask) :

  


  public void ExecuteFFmpeg()
{
    try
    {
        var launchPath = NSBundle.MainBundle.PathForResource("ffmpeg", ofType: "");
        var compressTask = new NSTask();
        compressTask.LaunchPath = launchPath;
        compressTask.Arguments = new string[] {
            "-i",
            "downloads/test.mp4",
            "-c",
            "copy",
            "-an",
            "nosound.mp4" };
        compressTask.StandardInput = NSFileHandle.FromNullDevice();
        compressTask.Launch();
        compressTask.WaitUntilExit();
    }
    catch (Exception ex)
    {

    }