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Autres articles (47)

  • La file d’attente de SPIPmotion

    28 novembre 2010, par

    Une file d’attente stockée dans la base de donnée
    Lors de son installation, SPIPmotion crée une nouvelle table dans la base de donnée intitulée spip_spipmotion_attentes.
    Cette nouvelle table est constituée des champs suivants : id_spipmotion_attente, l’identifiant numérique unique de la tâche à traiter ; id_document, l’identifiant numérique du document original à encoder ; id_objet l’identifiant unique de l’objet auquel le document encodé devra être attaché automatiquement ; objet, le type d’objet auquel (...)

  • Contribute to documentation

    13 avril 2011

    Documentation is vital to the development of improved technical capabilities.
    MediaSPIP welcomes documentation by users as well as developers - including : critique of existing features and functions articles contributed by developers, administrators, content producers and editors screenshots to illustrate the above translations of existing documentation into other languages
    To contribute, register to the project users’ mailing (...)

  • Use, discuss, criticize

    13 avril 2011, par

    Talk to people directly involved in MediaSPIP’s development, or to people around you who could use MediaSPIP to share, enhance or develop their creative projects.
    The bigger the community, the more MediaSPIP’s potential will be explored and the faster the software will evolve.
    A discussion list is available for all exchanges between users.

Sur d’autres sites (7015)

  • 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 to take a 2.1 file add some data and export as 2.1 file out back ?

    28 novembre 2019, par Teja8484

    I have a source file called A.wav. It has 2.1 channels (Stereo and mono channel) in audacity. I was able to split the stereo into mono channels B and C using the following command. D.wav is the other mono channel.

    ffmpeg -i A.wav -filter_complex "[0:a]channelsplit=channel_layout=stereo[left][right]" -map "[left]" B.wav -map "[right]" C.wav

    After adding some noise to the files i want to export all the three mono files into the same 2.1 format as it was originally present. (B+C = stereo, D=mono) to one 2.1 file. I know this can be done with ffmpeg. But not able to get the right command.

  • How can I convert a webm file with alpha channel to a hevc encoded file that will play in safari on an IPad ?

    21 septembre 2021, par Programming Guy

    I've got a webm file with transparency : https://itype.techforge.com.au/assets/videos/upshot/module1/NP_1A.webm

    


    I'm trying to convert it into something that will play in the video element of a web page in the Safari browser on an IPad.

    


    An example of a file that works is : https://rotato.netlify.app/alpha-demo/movie-hevc.mov

    


    My attempts at doing this conversion have all failed. 3rd party apps seem to all lose the alpha channel.

    


    On my mac I tried ffmpeg

    


    ffmpeg -i input.webm -c:v hevc_videotoolbox -allow_sw 1 -alpha_quality 0.75 -vtag hvc1 output.mov


    


    However, while this resulted in a file that reported a codec of MPEG-H Part2/HEVC (H.265) (hvc1) the resulting file still has a black background instead of a transparent one.

    


    ffmpeg log : https://pastebin.com/DMM9y5PU

    


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