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• Running "FFMPEG" for several times in winfoms

  13 November 2015, by Ahmad

  In a C# Windows application, I try to call "ffmpeg" to multiplex video and audio. It may be called several times. In the first call, everything is fine, but in the next call I have some problems. One problem is that the earlier "ffmpeg" process isn’t closed. So, I tried to kill it if it exists. but now I got an error for a disposed object in the following code:

     public static void FFMPEG3(string exe_path, string avi_path, string mp3_path, string output_file)
  
      {
  
          const int timeout = 2000;
  
          Kill(exe_path);
  
          using (Process process = new Process())
  
          {
  
              process.StartInfo.FileName = exe_path;
  
              process.StartInfo.Arguments = string.Format(@"-i ""{0}"" -i ""{1}"" -acodec copy -vcodec copy ""{2}""",
  
                                             avi_path, mp3_path, output_file);
  
              process.StartInfo.UseShellExecute = false;
  
              process.StartInfo.CreateNoWindow = true;
  
              process.StartInfo.RedirectStandardOutput = true;
  
              process.StartInfo.RedirectStandardError = true;
  
  
  
              StringBuilder output = new StringBuilder();
  
              StringBuilder error = new StringBuilder();
  
  
  
              using (AutoResetEvent outputWaitHandle = new AutoResetEvent(false))
  
              using (AutoResetEvent errorWaitHandle = new AutoResetEvent(false))
  
              {
  
                  process.OutputDataReceived += (sender, e) =>
  
                  {
  
                      if (e.Data == null)
  
                      {
  
                          outputWaitHandle.Set();
  
                      }
  
                      else
  
                      {
  
                          output.AppendLine(e.Data);
  
                      }
  
                  };
  
                  process.ErrorDataReceived += (sender, e) =>
  
                  {
  
                      if (e.Data == null)
  
                      {
  
                          errorWaitHandle.Set();
  
                      }
  
                      else
  
                      {
  
                          error.AppendLine(e.Data);
  
                      }
  
                  };
  
  
  
                  process.Start();
  
  
  
                  process.BeginOutputReadLine();
  
                  process.BeginErrorReadLine();
  
  
  
                  if (process.WaitForExit(timeout) &&
  
                      outputWaitHandle.WaitOne(timeout) &&
  
                      errorWaitHandle.WaitOne(timeout))
  
                  {
  
                      // Process completed. Check process.ExitCode here.
  
                      process.Close();
  
                  }
  
                  else
  
                  {
  
                      // Timed out.
  
                      process.Close();
  
                  }
  
              }
  
          }
  
      }

  I get ObjectDisposedException for ErrorDataRecieved event on errorWaitHandle.Set();

  First, I want to resolve this error, but if you know any better solution to run the "ffmpeg" for several times please suggest me.

• Insert Random silence multiple times between Audios in ffmpeg

  23 September 2021, by Gracie williams

  suppose I have MP3 of around 1 minute duration and increase its duration longer.Duration can be any.

  


  I want to randomly add N seconds of silence to that audio.

  


  I can generate the silence like below

  


  ffmpeg -f lavfi -i anullsrc=r=44100:cl=mono -t <seconds> -q:a 9 -acodec libmp3lame out.mp3&#xA;</seconds>

  


  And I can insert silence to audio like below

  


  ffmpeg -i in.wav -filter_complex "anullsrc,atrim=0:4[s];[0]atrim=0:14[a];[0]atrim=14,asetpts=N/SR/TB[b];[a][s][b]concat=3:v=0:a=1" out.wav


  


  Is there anyway to insert silence at multiple areas.With php I can generate random time to insert based on 60 seconds audio like below.

  


  $arr = [];
$arr[3] = 2; //here 3 is original audio insert time and 2 is the duration of silence
$arr[6] = 3;  //here 6 is original audio insert time and 3 is the duration of silence
$arr[10] = 1;
$arr[12] = 3;


  


  Now I want to insert silence between seconds based on above array like

  


  2 seconds silence at 3rd second
3 seconds silence at 6th second
1 second silence at 10th second


  


  and son on..

  


• external-downloader option not working as expected in youtube-dl

  31 March 2021, by Coder_H

  I was trying to download specific timestamps from youtube using youtube-dl as mentioned as mentioned here in the comments

  


  youtube-dl -v "https://www.youtube.com/watch?v=1I-3vJSC-Vo" -x -k --external-downloader ffmpeg --external-downloader-args "-ss 0:30 -to 0:35"


  


  I got the following error:

  


  [youtube] 1I-3vJSC-Vo: Downloading webpage
[download] Destination: ONE MINUTE OF PURE SATISFACTION _ Compilation 1-1I-3vJSC-Vo.f398.mp4
ffmpeg version 3.4.8-0ubuntu0.2 Copyright (c) 2000-2020 the FFmpeg developers
  built with gcc 7 (Ubuntu 7.5.0-3ubuntu1~18.04)
  configuration: --prefix=/usr --extra-version=0ubuntu0.2 --toolchain=hardened --libdir=/usr/lib/x86_64-linux-gnu --incdir=/usr/incl
ude/x86_64-linux-gnu --enable-gpl --disable-stripping --enable-avresample --enable-avisynth --enable-gnutls --enable-ladspa --enable
-libass --enable-libbluray --enable-libbs2b --enable-libcaca --enable-libcdio --enable-libflite --enable-libfontconfig --enable-libf
reetype --enable-libfribidi --enable-libgme --enable-libgsm --enable-libmp3lame --enable-libmysofa --enable-libopenjpeg --enable-lib
openmpt --enable-libopus --enable-libpulse --enable-librubberband --enable-librsvg --enable-libshine --enable-libsnappy --enable-lib
soxr --enable-libspeex --enable-libssh --enable-libtheora --enable-libtwolame --enable-libvorbis --enable-libvpx --enable-libwavpack
 --enable-libwebp --enable-libx265 --enable-libxml2 --enable-libxvid --enable-libzmq --enable-libzvbi --enable-omx --enable-openal -
-enable-opengl --enable-sdl2 --enable-libdc1394 --enable-libdrm --enable-libiec61883 --enable-chromaprint --enable-frei0r --enable-l
ibopencv --enable-libx264 --enable-shared
  WARNING: library configuration mismatch
  avcodec     configuration: --prefix=/usr --extra-version=0ubuntu0.2 --toolchain=hardened --libdir=/usr/lib/x86_64-linux-gnu --incd
ir=/usr/include/x86_64-linux-gnu --enable-gpl --disable-stripping --enable-avresample --enable-avisynth --enable-gnutls --enable-lad
spa --enable-libass --enable-libbluray --enable-libbs2b --enable-libcaca --enable-libcdio --enable-libflite --enable-libfontconfig -
-enable-libfreetype --enable-libfribidi --enable-libgme --enable-libgsm --enable-libmp3lame --enable-libmysofa --enable-libopenjpeg
--enable-libopenmpt --enable-libopus --enable-libpulse --enable-librubberband --enable-librsvg --enable-libshine --enable-libsnappy
--enable-libsoxr --enable-libspeex --enable-libssh --enable-libtheora --enable-libtwolame --enable-libvorbis --enable-libvpx --enabl
e-libwavpack --enable-libwebp --enable-libx265 --enable-libxml2 --enable-libxvid --enable-libzmq --enable-libzvbi --enable-omx --ena
ble-openal --enable-opengl --enable-sdl2 --enable-libdc1394 --enable-libdrm --enable-libiec61883 --enable-chromaprint --enable-frei0
r --enable-libopencv --enable-libx264 --enable-shared --enable-version3 --disable-doc --disable-programs --enable-libopencore_amrnb
--enable-libopencore_amrwb --enable-libtesseract --enable-libvo_amrwbenc
  libavutil      55. 78.100 / 55. 78.100
  libavcodec     57.107.100 / 57.107.100
  libavformat    57. 83.100 / 57. 83.100
  libavdevice    57. 10.100 / 57. 10.100
  libavfilter     6.107.100 /  6.107.100
  libavresample   3.  7.  0 /  3.  7.  0
  libswscale      4.  8.100 /  4.  8.100
  libswresample   2.  9.100 /  2.  9.100
  libpostproc    54.  7.100 / 54.  7.100
Option to (record or transcode stop time) cannot be applied to input url https://r7---sn-gwpa-civk.googlevideo.com/videoplayback?exp
ire=1617150322&ei=Em1jYPnzG7qr3LUP6eGr2A0&ip=2409%3A4043%3A609%3A4b92%3Ad9f7%3Ad14%3A44f9%3A8525&id=o-AALoNXBA9D9WAuCZn-2a9-JjLoqCOC
_11Lo7_9LdU7g0&itag=398&aitags=133%2C134%2C135%2C136%2C160%2C242%2C243%2C244%2C247%2C278%2C394%2C395%2C396%2C397%2C398&source=youtub
e&requiressl=yes&mh=05&mm=31%2C29&mn=sn-gwpa-civk%2Csn-gwpa-cvhd&ms=au%2Crdu&mv=m&mvi=7&pcm2cms=yes&pl=38&initcwndbps=148750&vprv=1&
mime=video%2Fmp4&ns=_3yx5zxNR1CYgHJamv8F-s4F&gir=yes&clen=4733883&dur=59.920&lmt=1578997687942906&mt=1617128452&fvip=7&keepalive=yes
&fexp=24001373%2C24007246&beids=9466588&c=WEB&txp=5431432&n=HoSSxcQKm_nNAUWgVTbz2&sparams=expire%2Cei%2Cip%2Cid%2Caitags%2Csource%2C
requiressl%2Cvprv%2Cmime%2Cns%2Cgir%2Cclen%2Cdur%2Clmt&sig=AOq0QJ8wRQIhAN-MjT3t_kpgwkOrBiw8f-0q5iDINPxu4bjfgZS66nNGAiBOLta-kt_AuaqGH
D-hJiElj9oNALl35IsBseYOR5AU4A%3D%3D&lsparams=mh%2Cmm%2Cmn%2Cms%2Cmv%2Cmvi%2Cpcm2cms%2Cpl%2Cinitcwndbps&lsig=AG3C_xAwRAIgIf334bMxslsq
Lxpnn2BATGGV6GWoWoJQQuMMgQL-NaMCICojD-uZ1VkyxIOQrfOwlLAEJ-gCe1skejtRBk-oHejU -- you are trying to apply an input option to an output
 file or vice versa. Move this option before the file it belongs to.
Error parsing options for input file https://r7---sn-gwpa-civk.googlevideo.com/videoplayback?expire=1617150322&ei=Em1jYPnzG7qr3LUP6e
Gr2A0&ip=2409%3A4043%3A609%3A4b92%3Ad9f7%3Ad14%3A44f9%3A8525&id=o-AALoNXBA9D9WAuCZn-2a9-JjLoqCOC_11Lo7_9LdU7g0&itag=398&aitags=133%2
C134%2C135%2C136%2C160%2C242%2C243%2C244%2C247%2C278%2C394%2C395%2C396%2C397%2C398&source=youtube&requiressl=yes&mh=05&mm=31%2C29&mn
=sn-gwpa-civk%2Csn-gwpa-cvhd&ms=au%2Crdu&mv=m&mvi=7&pcm2cms=yes&pl=38&initcwndbps=148750&vprv=1&mime=video%2Fmp4&ns=_3yx5zxNR1CYgHJa
mv8F-s4F&gir=yes&clen=4733883&dur=59.920&lmt=1578997687942906&mt=1617128452&fvip=7&keepalive=yes&fexp=24001373%2C24007246&beids=9466
588&c=WEB&txp=5431432&n=HoSSxcQKm_nNAUWgVTbz2&sparams=expire%2Cei%2Cip%2Cid%2Caitags%2Csource%2Crequiressl%2Cvprv%2Cmime%2Cns%2Cgir%
2Cclen%2Cdur%2Clmt&sig=AOq0QJ8wRQIhAN-MjT3t_kpgwkOrBiw8f-0q5iDINPxu4bjfgZS66nNGAiBOLta-kt_AuaqGHD-hJiElj9oNALl35IsBseYOR5AU4A%3D%3D&
lsparams=mh%2Cmm%2Cmn%2Cms%2Cmv%2Cmvi%2Cpcm2cms%2Cpl%2Cinitcwndbps&lsig=AG3C_xAwRAIgIf334bMxslsqLxpnn2BATGGV6GWoWoJQQuMMgQL-NaMCICoj
D-uZ1VkyxIOQrfOwlLAEJ-gCe1skejtRBk-oHejU.
Error opening input files: Invalid argument


ERROR: ffmpeg exited with code 1



  


  Why am I facing this error despite using the same format as mentioned in the link ?