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• How can I capture and record only specific part of the desktop using ffmpeg ?

  23 juillet 2018, par Benzi Avrumi

  This is how I’m using now to record the desktop.

  Using ffmpeg.exe : ffmpeg -f gdigrab -framerate 24 -i desktop -preset ultrafast -pix_fmt yuv420p out.mp4

  Or using csharp :

   using System;  
  
      using System.Collections.Generic;  
  
      using System.Linq;  
  
      using System.Text;  
  
      using System.Threading.Tasks;  
  
      using System.IO;  
  
      using System.Diagnostics;  
  
  
  
      namespace Ffmpeg_App  
  
      {  
  
          class Ffmpeg  
  
          {  
  
              Process process;  
  
  
  
              public void Start(string FileName, int Framerate)  
  
              {  
  
                  process = new System.Diagnostics.Process();  
  
                  process.StartInfo.FileName = @"D:\ffmpegx86\ffmpeg.exe"; // Change the directory where ffmpeg.exe is.  
  
                  process.EnableRaisingEvents = false;  
  
                  process.StartInfo.WorkingDirectory = @"D:\ffmpegx86"; // The output directory  
  
                  process.StartInfo.Arguments = @"-f gdigrab -framerate " + Framerate + " -i desktop -preset ultrafast -                                                                     pix_fmt yuv420p " + FileName;  
  
                  process.Start();  
  
                  process.StartInfo.UseShellExecute = false;  
  
                  process.StartInfo.CreateNoWindow = false;  
  
                  Close();  
  
              }  
  
  
  
              public void Close()  
  
              {  
  
                  process.Close();  
  
              }  
  
          }  
  
      }  

  And using it like this for example :

  Ffmpeg fpeg = new Ffmpeg(); 
  
  
  
  
  
      private void Start_Click(object sender, EventArgs e)  
  
              {  
  
                  fpeg.Start("test.mp4", 24);  
  
              }  
  
  
  
  
  
      private void Stop_Click(object sender, EventArgs e)  
  
              {  
  
                  fpeg.Close();  
  
              } 

  This will record the entire desktop window to a video file.
  But how can I record a specific rectangle area in the desktop ? For example to record only the right bottom corner rectangle size 10x10.

  So when I will play the video file I will see full screen video but only of the right bottom corner of the desktop.

• Using FFMPEG to Batch Convert a Series of Separate Image Sequences

  1er juillet 2018, par RFrendt

  I am trying to convert a large set of image sequences (each contained within its own subfolder) to video files. I can currently convert one sequence at a time by using ffmpeg and this code :

  ffmpeg -r 30 -i "Image%%05d.jpg" -vf scale=1376:768 -qscale:v 2 "Display 1.m2v"

  I also occasionally batch convert avi files which are contained within a single folder using :

  for %%a in ("*.avi") do ffmpeg -i "%%a" -qscale:v 2 "%%~na.m2v"

  I assumed I’d be able to use this batch approach with separate image sequences.
  What I’m having trouble with is figuring out the syntax for a similar batch code that will convert whatever image sequence is present in a folder (or subfolder) using the anyfile%%05d naming convention. The %%a syntax in the second line of code doesn’t seem to be compatible with the way ffmpeg recognizes image sequences anyfile%%05d in the first. Any thoughts ?

• tiff series to mp4 using ffmpeg

  11 avril 2018, par Learning from masters

  I have a big tiff file which contains several (1000) images inside. How can I convert this file into a mp4 video ?

  I tried : ffmpeg -i test.tiff test.mp4 but it gives me :

  ffmpeg version N-82966-g6993bb4 Copyright (c) 2000-2016 the FFmpeg
  developers built with gcc 5.4.0 (GCC) configuration : —enable-gpl
  —enable-version3 —enable-dxva2 —enable-libmfx -
  -enable-nvenc —enable-avisynth —enable-bzlib —enable-fontconfig —enable-frei 0r —enable-gnutls —enable-iconv —enable-libass —enable-libbluray —enable-li bbs2b —enable-libcaca —enable-libfreetype —enable-libgme —enable-libgsm —en able-libilbc —enable-libmodplug —enable-libmp3lame —enable-libopencore-amrnb
  —enable-libopencore-amrwb —enable-libopenh264 —enable-libopenjpeg —enable-li bopus —enable-librtmp —enable-libsnappy —enable-libsoxr —enable-libspeex —e nable-libtheora —enable-libtwolame —enable-libvidstab —enable-libvo-amrwbenc
  —enable-libvorbis —enable-libvpx —enable-libwavpack —enable-libwebp —enable
  -libx264 —enable-libx265 —enable-libxavs —enable-libxvid —enable-libzimg —e nable-lzma —enable-decklink —enable-zlib libavutil 55. 43.100 / 55. 43.100 libavcodec 57. 70.100 /
  57. 70.100 libavformat 57. 61.100 / 57. 61.100 libavdevice 57. 2.100 / 57. 2.100 libavfilter 6. 68.100 / 6. 68.100 libswscale 4. 3.101 / 4. 3.101 libswresample 2. 4.100 /
  2. 4.100 libpostproc 54. 2.100 / 54. 2.100 [tiff_pipe @ 000000000042a6e0] Stream #0 : not enough frames to estimate rate ; co
  nsider increasing probesize [tiff_pipe @ 000000000042a6e0] decoding
  for stream 0 failed [tiff_pipe @ 000000000042a6e0] Could not find
  codec parameters for stream 0 (Vid eo : tiff, none) : unspecified size
  Consider increasing the value for the ’analyzeduration’ and
  ’probesize’ options Input #0, tiff_pipe, from ’test.tiff’ : Duration :
  N/A, bitrate : N/A
  Stream #0:0 : Video : tiff, none, 25 tbr, 25 tbn, 25 tbc [buffer @ 0000000000454460] Unable to parse option value "0x0" as image size
  [buffer @ 0000000000454460] Unable to parse option value "-1" as pixel
  format [buffer @ 0000000000454460] Unable to parse option value "0x0"
  as image size [buffer @ 0000000000454460] Error setting option
  video_size to value 0x0. [graph 0 input from stream 0:0 @
  0000000000454340] Error applying options to the filter. Error opening
  filters !