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• Downloading a Few Seconds of Audio from a Youtube Video with ffmpeg and youtube-dl Results in [youtube] : No such file or directory error

  20 décembre 2018, par DrJessop

  Below is the program that I wrote :

  ffmpeg -ss 60 -t 10 -i $(youtube-dl -f 140 https://www.youtube.com/watch?v=kDCk3hLIVXo) output.mp3

  This is supposed to get 10 seconds of audio starting at the one minute mark of the video and write it to output.mp3. If I run the youtube-dl command separately, and then the ffmpeg command with the entire video audio as input, it works. But, I do not want to download the entire video as well as create a new file with only a few seconds of audio.

  In its current state, I am getting [youtube] : No such file or directory errors. Does anyone know how I can fix this and keep it in one line ?

• How to correctly close a console application using the youtube-dl process to download Twitch stream whenever I want

  24 juin 2023, par ElPavlillo

  The test program has the following code :

  


  string url = "https://www.twitch.tv/ricoy";
string outputPath = @"D:\ruta_del_archivo_salida.mp4";

ProcessStartInfo startInfo = new ProcessStartInfo
{
    FileName = "youtube-dl",
    Arguments = $"-f best -o \"{outputPath}\" \"{url}\"",
    //RedirectStandardOutput = true,
    UseShellExecute = false,
    CreateNoWindow = true
};

using (Process process = new Process())
{
    process.StartInfo = startInfo;
    process.Start();

    //var output = process.StandardOutput.ReadToEnd();
    //process.WaitForExit();

    Console.Read();
    KillProcessAndChildren(process.Id);
}

static void KillProcessAndChildren(int pid)
{
    // Cannot close 'system idle process'.
    if (pid == 0)
    {
        return;
    }
    ManagementObjectSearcher searcher = new ManagementObjectSearcher
            ("Select * From Win32_Process Where ParentProcessID=" + pid);
    ManagementObjectCollection moc = searcher.Get();
    foreach (ManagementObject mo in moc)
    {
        KillProcessAndChildren(Convert.ToInt32(mo["ProcessID"]));
    }
    try
    {
        Process proc = Process.GetProcessById(pid);
        proc.Kill();
    }
    catch (ArgumentException)
    {
        // Process already exited.
    }
}


  


  The problem is that when I press de key in the console the youtube-dl process gets kill and also de ffmpeg but the file is left with .part extension and does not work.

  


  I was expecting the code to left a .mp4 file but for reason it does not.

  


• How to get a list of libraries ffmpeg has linked to (static ffmpeg libraries) ?

  6 octobre 2018, par myWallJSON

  I have compiled Ffmpeg (1.0) with newt configuration :

  ./configure  --disable-doc  --disable-ffplay --disable-ffprobe  --disable-ffserver    --disable-avdevice   --disable-avfilter   --disable-pthreads  --disable-everything --enable-muxer=flv --enable-encoder=flv --enable-encoder=h263 --disable-mmx  --disable-shared   --prefix=bin/  --disable-protocols --disable-network --disable-debug  --disable-asm --disable-stripping

  It compiled - no errors - headers and libs (static .a) are in place. (special experimental cigwin, experimental gcc, with no asm options, and no known by ffmpeg platform defines) (yet I have compiled and tested boost on it)

  Now I try to compile my app. I get next exceptions :

  ../ffmpeg-1.0/bin/lib/libavcodec.a: error: undefined reference to 'exp'
  
  ../ffmpeg-1.0/bin/lib/libavcodec.a: error: undefined reference to 'log'

  My compiler build line looks like this :

  g++ -static -emit-swf -o CloudClient.swf  -I../boost/boost_libraries/install-dir/include -I../ffmpeg-1.0/bin/include -L../boost/boost_libraries/install-dir/lib -L../ffmpeg-1.0/bin/lib \
  
      timer.o \
  
      audio_encoder.o \
  
      audio_generator.o \
  
      video_encoder.o \
  
      video_generator_rainbow.o \
  
      simple_synchronizer.o \
  
      multiplexer.o \
  
      transmitter.o \
  
      graph_runner.o \
  
      cloud_client.o \
  
      -pthread \
  
      -lswscale \
  
      -lavutil \
  
      -lavformat \
  
      -lavcodec \
  
      -lboost_system \
  
      -lboost_date_time \
  
      -lboost_thread 

  So as you see quite complex and I already have all object files compiled and ready... Only one thing left - link it all to ffmpeg (striped from ffmpeg version compiled with boost)

  Tried adding -lm - no help...

  Well here my question is - how to get list of libraries ffmpeg linked to (like -lm etc) ?