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• ffmpeg fontfile works fine with command prompt but did not work when called via C# code

  13 août 2020, par Aman singh Parihar

  ffmpeg.exe -y -i "C:\TEST.mp4" -frames:v 1 -filter_complex "drawtext=fontfile='/Windows/Fonts/GOTHIC.TTF': text='TEST': fontcolor=Red: fontsize = 100: x=(w/100)*5: y=(h/100)*87: " D:\ffoutput.png 


  


  This command works fine when executed from the command prompt. But when the same command is executed using the C# code, it does not work. Although everything works fine instead of fontfile.
Forex : color of the text will chnage, x and y will change, fontsize will change but fontstyle(fontfile) will not change.
Function call Execute("ffmpeg.exe","-y -i "C:\TEST.mp4" -frames:v 1 -filter_complex "drawtext=fontfile='/Windows/Fonts/GOTHIC.TTF': text='TEST': fontcolor=Red: fontsize = 100: x=(w/100)*5: y=(h/100)*87: " D:\ffoutput.png")

  


          private string Execute(string exePath, string parameters)
        {
            /*C# code which does not work*/
            string result = String.Empty;

            using (Process p = new Process())
            {
                p.StartInfo.UseShellExecute = false;
                p.StartInfo.CreateNoWindow = true;
                p.StartInfo.RedirectStandardOutput = true;
                p.StartInfo.FileName = exePath;
                p.StartInfo.Arguments = parameters;
                p.StartInfo.Verb = "runas";
                p.Start();
                p.WaitForExit();
                result = p.StandardOutput.ReadToEnd();
            }

            return result;
        }


  


• How map_channel works in ffmpeg ?

  2 août 2020, par Redbraid

  I need to extract channels from 5.1 audios. These audio tracks are contained in a MKV file. Structure of "movie.mkv" file is like this :

  


  Input #0, matroska,webm, from 'movie.mkv':
  Duration: 00:40:38.08, start: 0.000000, bitrate: 21128 kb/s
    Stream #0:0(eng): Video: h264 (High), yuv420p(tv, bt709, progressive), 1920x800 [SAR 1:1 DAR 12:5], 24 fps, 24 tbr, 1k tbn, 48 tbc
    Stream #0:1(eng): Audio: ac3, 48000 Hz, 5.1(side), fltp, 384 kb/s
    Stream #0:2(ger): Audio: dts (DTS), 48000 Hz, 5.1(side), fltp, 1536 kb/s
    Stream #0:3(eng): Subtitle: subrip


  


  But the syntax is very messy, so I did not figure out how to extract channels properly.

  


  This code, for the first audio track, works fine :

  


  ffmpeg -i "movie.mkv" -map_channel 0.1.0 "eng channel 1.wav"
ffmpeg -i "movie.mkv" -map_channel 0.1.1 "eng channel 2.wav"
ffmpeg -i "movie.mkv" -map_channel 0.1.2 "eng channel 3.wav"
ffmpeg -i "movie.mkv" -map_channel 0.1.3 "eng channel 4.wav"
ffmpeg -i "movie.mkv" -map_channel 0.1.4 "eng channel 5.wav"
ffmpeg -i "movie.mkv" -map_channel 0.1.5 "eng channel 6.wav"


  


  I believe that 0.1.0 is : input #0 (movie.mkv) ; then stream 1 (audio eng) ; then channel 0 (very first channel).

  


  But when I'm trying to extract channels from second audio track...

  


  ffmpeg -i "movie.mkv" -map_channel 0.2.0 "ger channel 1.wav"
ffmpeg -i "movie.mkv" -map_channel 0.2.1 "ger channel 2.wav"
ffmpeg -i "movie.mkv" -map_channel 0.2.2 "ger channel 3.wav"
ffmpeg -i "movie.mkv" -map_channel 0.2.3 "ger channel 4.wav"
ffmpeg -i "movie.mkv" -map_channel 0.2.4 "ger channel 5.wav"
ffmpeg -i "movie.mkv" -map_channel 0.2.5 "ger channel 6.wav"


  


  ...it extracts not German sound, but instead it results with the same eng channels (which also sound little louder than in previous case). In this code, 0.2.0 appears to be : input #0 (movie.mkv) ; then stream 2 (audio ger) ; then channel 0 (very first channel).

  


  So what am I doing wrong ? :-)

  


• Windows 10 EV code signing no longer works on electron app

  23 février 2021, par SoOhNo

  I have an electron app. Pretty basic app. It doesn't use ffmpeg for anything it does play an mp3 chime from time to time. I build my app with electron-forge using squirrel format. I then sign it using the SafeNet Authentication app. It's always worked flawlessly.

  


  It's been a couple months since I last released a version. Only thing that has changed is some html ui updates within my electron app and of course lots of Windows 10 updates.

  


  My app builds fine using electron-forge, it installs and runs without issue. I then sign it like usual from the command line and SafeNet confirms it was signed. Right clicking on the file shows it has been signed by my organization. However, once I execute the signed app I get this error : "The code execution cannot proceed because ffmpeg.dll was not found. Reinstalling the program may fix this problem."

  


  Here is what I have tried so far :

  


  

  • Building/Signing on a different windows 10 machine.

  


  • Uninstall/Reinstall SafeNet.

  


  • Running signed .exe on a different Windows 10 instance

  


  • Building/Signing with a cmd session ran as administrator

  


  


  I am at a loss, why is it screaming about ffmpeg.dll which my app doesn't depend on ? Why only after the .exe has been signed do I get this error ?

  


  OS : Windows 10
  
Electron v7.3.2
  
Electron-Forge/cli v6.0.0-beta.47
  
SafeNet x64 v10.3