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• Stremio::FFMPEG Error while opening encoder for output stream #0:1

  28 février 2015, par user2547496

  Getting this error using Stremio::FFMPEG wrapper for converting /MOV to .MP4

  Error while opening encoder for output stream #0:1 - maybe incorrect     parameters such as bit_rate, rate, width or height

  Here are my commands

  require 'streamio-ffmpeg'
  
  movie = FFMPEG::Movie.new("tmp/movie.ogg")
  
  movie.transcode("tmp/movie.mp4")

  Here’s the output =>

  Running transcoding...
  
  ffmpeg -y -i tmp/movie.ogg  tmp/movie.mp4
  
  
  
  E, [2015-02-28T03:06:00.797778 #6381] ERROR -- : Failed encoding...
  
  ffmpeg -y -i tmp/movie.ogg  tmp/movie.mp4
  
  
  
  Output #0, mp4, to 'tmp/movie.mp4':
  
      Stream #0:0: Video: h264, yuv420p, 640x480 [SAR 1:1 DAR 4:3], q=-1--1, 90k tbn, 24 tbc
  
  
  
  Stream mapping:
  
    Stream #0:0 -> #0:0 (theora -> libx264)
  
    Stream #0:1 -> #0:1 (flac -> libaacplus)
  
  Error while opening encoder for output stream #0:1 - maybe incorrect parameters such as bit_rate, rate, width or height
  
  
  
  Errors: encoded file is invalid. 
  
  
  
  Stream mapping:
  
    Stream #0:0 -> #0:0 (theora -> libx264)
  
    Stream #0:1 -> #0:1 (flac -> libaacplus)
  
  Error while opening encoder for output stream #0:1 - maybe incorrect parameters such as bit_rate, rate, width or height

• How to pipe output from ffmpeg

  27 février 2015, par Andrew Simpson

  I have a c# desktop app.

  I want to stream an RTSP feed from my camera to my app, and in my app save jpegs as they come through.

  I use mpdecimate to restrict frames that are changes to the previous frame.

  If I open a DOS windows and type in :

  ffmpeg -i rtsp://admin:admin@192.168.0.17:554/video_0 -vf mpdecimate -r 10 output.avi 2>log.txt 

  it works.

  if I put this into a C# app the log file reports :

     ffmpeg version N-69779-g2a72b16 Copyright (c) 2000-2015 the FFmpeg developers
  
    built with gcc 4.9.2 (GCC)
  
    configuration: --enable-gpl --enable-version3 --disable-w32threads --enable-avisynth --enable-bzlib --enable-fontconfig --enable-frei0r --enable-gnutls --enable-iconv --enable-libass --enable-libbluray --enable-libbs2b --enable-libcaca --enable-libfreetype --enable-libgme --enable-libgsm --enable-libilbc --enable-libmodplug --enable-libmp3lame --enable-libopencore-amrnb --enable-libopencore-amrwb --enable-libopenjpeg --enable-libopus --enable-librtmp --enable-libschroedinger --enable-libsoxr --enable-libspeex --enable-libtheora --enable-libtwolame --enable-libvidstab --enable-libvo-aacenc --enable-libvo-amrwbenc --enable-libvorbis --enable-libvpx --enable-libwavpack --enable-libwebp --enable-libx264 --enable-libx265 --enable-libxavs --enable-libxvid --enable-lzma --enable-decklink --enable-zlib
  
    libavutil      54. 18.100 / 54. 18.100
  
    libavcodec     56. 22.100 / 56. 22.100
  
    libavformat    56. 21.100 / 56. 21.100
  
    libavdevice    56.  4.100 / 56.  4.100
  
    libavfilter     5. 11.100 /  5. 11.100
  
    libswscale      3.  1.101 /  3.  1.101
  
    libswresample   1.  1.100 /  1.  1.100
  
    libpostproc    53.  3.100 / 53.  3.100
  
  Input #0, rtsp, from 'rtsp://admin:admin@192.168.0.17:554/video_0':
  
    Metadata:
  
      title           : YOKO Live Streaming
  
      comment         : video_0
  
    Duration: N/A, start: 0.000000, bitrate: N/A
  
      Stream #0:0: Video: mjpeg, yuvj420p(pc, bt470bg/unknown/unknown), 352x288 [SAR 1:1 DAR 11:9], 90k tbr, 90k tbn, 90k tbc
  
  [NULL @ 04d6a1e0] Unable to find a suitable output format for 'mpdecimate'
  
  mpdecimate: Invalid argument

  So, I tweaked it with things I thought would make it work but still teh same error.

  This is my last attempt at this :

  Process process = new Process();
  
  {
  
      FileStream baseStream = null;  
  
      string arguments = "-i rtsp://admin:admin@192.168.0.17:554/video_0 -vf image2pipe mpdecimate -r 10 - 0";
  
      string file = @"C:\bin\ffmpeg.exe";
  
      process.StartInfo.FileName = file;
  
      process.StartInfo.Arguments = arguments;
  
      process.StartInfo.CreateNoWindow = true;
  
      process.StartInfo.RedirectStandardError = true;
  
      process.StartInfo.RedirectStandardOutput = true;
  
      process.StartInfo.UseShellExecute = false;
  
      Task.Run(() =>
  
      {
  
          try
  
          {
  
              process.Start();
  
              byte[] buffer = new byte[200000];
  
              var error = process.StandardError.ReadToEnd();
  
              baseStream = process.StandardOutput.BaseStream as FileStream;
  
              bool gotHeader = false;
  
              bool imgFound = false;
  
              int counter = 0;
  
              while (true)
  
              {
  
                  byte bit1 = (byte)baseStream.ReadByte();
  
                  buffer[counter] = bit1;
  
                  if (bit1 == 217 && gotHeader)
  
                  {
  
                      if (buffer[counter - 1] == 255)
  
                      {
  
                          byte[] jpeg = new byte[counter];
  
                          Buffer.BlockCopy(buffer, 0, jpeg, 0, counter);
  
                          using (MemoryStream ms = new MemoryStream(jpeg))
  
                          {
  
                              pictureBox1.Image = Image.FromStream(ms);
  
                              ms.Close();
  
                          }
  
                          imgFound = true;
  
                      }
  
                  }
  
                  else if (bit1 == 216)
  
                  {
  
                      if (buffer[counter - 1] == 255)
  
                      {
  
                          gotHeader = true;
  
                      }
  
                  }
  
                  if (imgFound)
  
                  {
  
                      counter = 0;
  
                      buffer = new byte[200000];
  
                      imgFound = false;
  
                      gotHeader = false;
  
                  }
  
                  else
  
                  {
  
                      counter++;
  
                  }
  
              }
  
          }
  
          catch (Exception ex2)
  
          {
  
              //log error here
  
          }
  
      });
  
  }
  
  catch (Exception ex)
  
  {
  
      //log error here
  
  }

  any suggestion I will glady try out...

• Convert PNGs to webm video with transparency

  20 septembre 2016, par sebastian

  I would like to use avconv to convert a series of PNG images to a WebM video, preserving transparency.

  I understand that the pixel format used in the output video must support transparency. So I tried :

  $ avconv -framerate 25 -f image2 -i frames/%03d.png -pix_fmt yuva420p output.webm

  Unfortunately, avconv complains :

  Incompatible pixel format 'yuva420p' for codec 'libvpx-vp9', auto-selecting format 'yuv420p'

  I am using ffmpeg version 2.8.4-1+b1 Copyright (c) 2000-2015 the FFmpeg developers.