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• After video convert to hls with ffmpeg, new video has no screen and has just audio

  27 octobre 2023, par Sevada Grigoryan

  I am having problems with HLS stream creation, sometimes my created video just has audio and it's display a black screen
Here is my code in below

  


  /opt/nodejs/ffmpeg -i "https://******-v1-post-content.s3.us-east-
2.amazonaws.com/104/posts/win/video/item-1615842876280.mov" -codec: copy -start_number 0 -hls_time 10 -hls_list_size 0 -f hls /tmp/item-1615842876280.m3u8


  


  The Output Of command

  


  stderr: ffmpeg version 4.2.3-static https://johnvansickle.com/ffmpeg/  Copyright (c) 2000-2020 the FFmpeg developers
  built with gcc 8 (Debian 8.3.0-6)
Input #0, mov,mp4,m4a,3gp,3g2,mj2, from 'https://*****-v1-post-content.s3.us-east-2.amazonaws.com/104/posts/win/video/item-1615842876280.mov:
  Metadata:
    major_brand     : qt  
    minor_version   : 0
    compatible_brands: qt  
    creation_time   : 2021-03-13T08:49:02.000000Z
  Duration: 00:00:03.50, start: 0.000000, bitrate: 7984 kb/s
    Stream #0:0(und): Video: hevc (Main) (hvc1 / 0x31637668), yuv420p(tv, bt709), 1920x1080, 7881 kb/s, 29.97 fps, 29.97 tbr, 600 tbn, 600 tbc (default)
    Metadata:
      rotate          : 90
      creation_time   : 2021-03-13T08:49:02.000000Z
      handler_name    : Core Media Video
      encoder         : HEVC
    Side data:
      displaymatrix: rotation of -90.00 degrees
    Stream #0:1(und): Audio: aac (LC) (mp4a / 0x6134706D), 44100 Hz, mono, fltp, 83 kb/s (default)
    Metadata:
      creation_time   : 2021-03-13T08:49:02.000000Z
      handler_name    : Core Media Audio
[hls @ 0x6684ec0] Opening '/tmp/item-16158428762800.ts' for writing
Output #0, hls, to '/tmp/item-1615842876280.m3u8':
  Metadata:
    major_brand     : qt  
    minor_version   : 0
    compatible_brands: qt  
    encoder         : Lavf58.29.100
    Stream #0:0(und): Video: hevc (Main) (hvc1 / 0x31637668), yuv420p(tv, bt709), 1920x1080, q=2-31, 7881 kb/s, 29.97 fps, 29.97 tbr, 90k tbn, 600 tbc (default)
    Metadata:
      rotate          : 90
      creation_time   : 2021-03-13T08:49:02.000000Z
      handler_name    : Core Media Video
      encoder         : HEVC
    Side data:
      displaymatrix: rotation of -90.00 degrees
    Stream #0:1(und): Audio: aac (LC) (mp4a / 0x6134706D), 44100 Hz, mono, fltp, 83 kb/s (default)
    Metadata:
      creation_time   : 2021-03-13T08:49:02.000000Z
      handler_name    : Core Media Audio
Stream mapping:
  Stream #0:0 -> #0:0 (copy)
  Stream #0:1 -> #0:1 (copy)


  


  Thank you !

  


  Sevada

  


• Large Video file Conversion using ffmpeg

  12 mai 2021, par Varsha

  I am using ffmpeg tool to convert videos from wmv to mp4 formats using the following code -

  


          string outputPath = args[1].ToString();
        string[] files = Directory.GetFiles(inputPath);               
        Console.WriteLine(files.Length);
        foreach (var item in files)
        {
            itemBkp = item;                                       
            Process proc = new Process();
            proc.StartInfo.FileName = @"e:\test\ffmpeg.exe";                   
            string filename= Path.GetFileName(item);                    
            proc.StartInfo.Arguments=  " -i "  + item + " " + outputPath + filename.Split('.')[0] + ".mp4";
            proc.StartInfo.UseShellExecute = false;
            proc.StartInfo.RedirectStandardInput = true;
            proc.StartInfo.RedirectStandardOutput = true;
            proc.Start();
            proc.WaitForExit();
        }


  


  It works fine for videos up to 20mb but when i try for videos above 70mb it throws following error -

  


  FFmpeg version SVN-r6179, Copyright (c) 2000-2004 Fabrice Bellard configuration : —extra-cflags=-I/static/include —extra-ldflags=-L/static/lib —enable-memalign-hack —enable-mp3lame —enable-xvid —enable-a52 —enable-libogg —enable-vorbis —enable-faac —enable-faad —enable-x264 —enable-pp —enable-amr_wb —enable-amr_nb —enable-avisynth —enable-gpl libavutil version : 49.0.0 libavcodec version : 51.13.0 libavformat version : 50.5.0 built on Sep 5 2006 22:41:30, gcc : 3.4.5 (mingw special) E :\videos\Playful : I/O error occured Usually that means that input file is truncated and/or corrupted.

  


  Is there a limit on video size to be converted ?

  


• nreco wrapper bitmap streaming through rtmp

  16 avril 2021, par pavel63

  I'm developing an application for real time streaming.
capture frames from video devices and encoding with a ffmpeg wrapper called nreco.

  



  the problerm is that if i try to stream encoded video to red5 via rtmp on red5 server, connection is immediatily closed.

  



  this is the code i use to configure the output streaming :

  



  ffMpegTask = videoConv.ConvertLiveMedia(
     Format.raw_video,
     outstream,
     Format.flv,
     new ConvertSettings()
     {
         CustomInputArgs = " -re -pix_fmt bgr24 -video_size 800x600 ", 
         CustomOutputArgs = " -acodec copy -vcodec libx264 -pix_fmt yuv420p rtmp://127.0.0.1/live/stream ",   
     });

      ffMpegTask.Start();


  



  adding frame this way :

  



  void camera_Frame(object sender, FrameEventArgs e)
{
   Bitmap item = e.Frame;

   BitmapData bd = item.LockBits(new Rectangle(0, 0, item.Width, item.Height), ImageLockMode.ReadOnly, PixelFormat.Format24bppRgb);
   byte[] buf = new byte[bd.Stride * item.Height];
   Marshal.Copy(bd.Scan0, buf, 0, buf.Length);
   ffMpegTask.Write(buf, 0, buf.Length);
   item.UnlockBits(bd);
}  


  



  any help ?