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• ffmpeg save hls to m3u8 with mp4 segments

  9 juin 2018, par J. Omen

  I am looking for a command ffmpeg, which saving live input (rtmp or hls) to hls m3u8 with mp4 segments files. I know that it is possible to do, i.e. there is infohttps://bitmovin.com/hls-news-wwdc-2016/ but every command I tries - makes ts files. Anyone know solution ?

• Can't save process's output stream to file

  10 octobre 2018, par Wahid Masud

  I’m using ffmpeg.exe as a process and output the converted video to memory, then from memory I’m saving the data to a video file (this is the requirement I can’t directly save the converted video to a file). But the conversion is not working for some reason, Here is what I’ve tried,

  var ffmpeg = HttpContext.Current.Server.MapPath("~/FFMpeg/ffmpeg.exe");
  
  var outputDir = HttpContext.Current.Server.MapPath("~/Uploads/converted.mp4");
  
  var inputDir = "https://www.sample-videos.com/video/mp4/720/big_buck_bunny_720p_10mb.mp4";
  
  var args = "-i " + inputDir + " -c:v libx264 -preset veryslow -crf 26 " +
  
              "-ar 44100 -ac 2 -c:a aac -strict -2 -b:a 128k -";
  
  
  
  var process = new Process();
  
  process.StartInfo.UseShellExecute = false;
  
  process.StartInfo.FileName = ffmpeg;
  
  process.StartInfo.WorkingDirectory = ffmpeg.Replace("\\ffmpeg.exe", "");
  
  process.StartInfo.Arguments = args;
  
  process.StartInfo.RedirectStandardOutput = true;
  
  process.Start();
  
  process.EnableRaisingEvents = true;
  
  //process.WaitForExit();
  
  Stream output = process.StandardOutput.BaseStream;
  
  process.Exited += (sender, e) =>
  
  {
  
      using (var fileStream = File.Create(outputDir))
  
      {
  
          output.Seek(0, SeekOrigin.Begin);
  
          output.CopyTo(fileStream);
  
      }
  
  };  

  The output file converted.mp4 is created but its 0 kb.

• FFMPEG save last 10 sec before a movement and next 30secs

  2 novembre 2020, par Set1ish

  I have a surveillance camera that process frame by frame live video. In case of movement, I want to save a video containing the last 10 seconds before the movement and next 30 seconds after the movement.
I beleve (may be I'm wrong), that last 10 second + next 30seconds task, should be obtained without decoding-rencoding process.

  


  I try to use python with fmmpeg pipes, creating a reader and a writer, but the reader seams too slow for the stream and I loose some packets (= loose on video quality for saved file).

  


  Here my code

  


  import ffmpeg
import numpy as np

width = 1280
height = 720


process1 = (
    ffmpeg
    .input('rtsp://.....',rtsp_transport='udp', r='10', t="00:00:30")
    .output('pipe:', format='rawvideo', pix_fmt='yuv420p')
    .run_async(pipe_stdout=True)
)

process2 = (
    ffmpeg
    .input('pipe:', format='rawvideo', pix_fmt='yuv420p', s='{}x{}'.format(width, height))
    .output("prova-02-11-2020.avi", pix_fmt='yuv420p',r='10')
    .overwrite_output()
    .run_async(pipe_stdin=True)
)
while True:
    in_bytes = process1.stdout.read(width * height * 3)
    if not in_bytes:
        break
    in_frame = (
        np
        .frombuffer(in_bytes, np.uint8)
        )

    #In future I will save in_frame in a queue
    out_frame = in_frame
   
    process2.stdin.write(
        out_frame
        .astype(np.uint8)
        .tobytes()
    )

process2.stdin.close()
process1.wait()
process2.wait()


  


  If I run

  


  ffmpeg -i rtsp://... -acodec copy -vcodec copy -t "00:00:30" out.avi


  


  It look that decode-rencode process is done in quick/smart way without loosing any packet.
My dream is to make the same on python for the surveillance camera but intergrating with code that analyse the stream.

  


  I would like that the flow for creating the file, does not requires decoding + enconding. The last 10secs frames are in a queue and, at specific event, the contenet of queue plus next 30secs frames are saved into a avi file

  


  I have the constraints to have realtime motion detection on live streaming

  


  Did you have any comments or suggestion ?