Recherche avancée

Sur d’autres sites (8189)

• Output file does not show up after executing ffmpeg command [closed]

  19 février 2024, par davai

  I'm using ffmpeg to combine an MP3 + G file and produce an MP4 file. I've placed the source code / .exe file for 'ffmpeg' in the project folder, and the MP3 + G files are also in the project folder. I also set the MP4 output to show up in the project folder as well. The weird thing is that, initially, I was producing output files, and while trying to tweak the constant rate factor, the MP4 output just stopped showing up entirely. I'm also not receiving any errors while running the code, and it does print out that the file has been successfully created, despite nothing showing up in the project folder.

  


  
        String mp3FilePath = "C:/Users/exampleuser/pfolder/example.mp3";
        String gFilePath = "C:/Users/exampleuser/pfolder/example.cdg";
        String mp4OutputPath = "C:/Users/exampleuser/pfolder/example.mp4";

        try
        {
            String[] command = {
                    "C:/Users/tonih/IdeaProjects/MP3GtoMP4Conversion/ffmpeg/ffmpeg-2024-02-19-git-0c8e64e268-full_build/bin/ffmpeg.exe",
                    "-i", mp3FilePath,       // Input MP3 file
                    "-r", "25",              // Frame rate
                    "-loop", "1",            // Loop input video
                    "-i", gFilePath,         // Input G file
                    "-c:v", "libx264",       // Video codec
                    "-preset", "slow",       // Encoding preset for quality (choose according to your requirement)
                    "-crf", "18",            // Constant Rate Factor (lower is higher quality, typical range 18-28)
                    "-c:a", "aac",           // Audio codec
                    "-b:a", "320k",          // Audio bitrate
                    "-shortest",             // Stop when the shortest stream ends
                    mp4OutputPath            // Output MP4 file
            };

            Process process = Runtime.getRuntime().exec(command);
            process.waitFor();
            System.out.println("MP4 file created successfully: " + mp4OutputPath);
        }
        catch (IOException | InterruptedException e)
        {
            e.printStackTrace();
        }


  


• How can I generate a video file directly from an FFmpeg filter with no actual input file ?

  26 août 2016, par blahdiblah

  FFmpeg has a number of video generating filters, listed in the documentation as "video sources" :

  • cellauto
  • color
  • mptestsrc
  • fei0r_src
  • life
  • nullsrc, rgbtestsrc, testsrc

  Those are great for using with other filters like overlay, but is there any way that I can generate a movie consisting of just one of those video sources without any input video ?

  Something like :

  ffmpeg -vf color=red" red_movie.mp4

  Except that that errors out with At least one input file must be specified.

• How can I generate a video file directly from an FFmpeg filter with no actual input file ?

  12 mai, par blahdiblah

  FFmpeg has a number of video generating filters, listed in the documentation as "video sources" :

  



  

  • cellauto

  


  • color

  


  • mptestsrc

  


  • fei0r_src

  


  • life

  


  • nullsrc, rgbtestsrc, testsrc

  


  



  Those are great for using with other filters like overlay, but is there any way that I can generate a movie consisting of just one of those video sources without any input video ?

  



  Something like :

  



  ffmpeg -vf color=red" red_movie.mp4


  



  Except that that errors out with At least one input file must be specified.