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• libavformat/mov.c : Fix "statement will never be executed" warning

  31 juillet, par zhaozhenghang

  libavformat/mov.c : Fix "statement will never be executed" warning
  That occurs when H261, H263, and MPEG4 decoders are disabled.
  Signed-off-by : zhaozhenghang <15083277223@163.com>
  
  Signed-off-by : Zhao Zhili <zhilizhao@tencent.com>
  

  • [DH] libavformat/mov.c

• FFMPEG Video not working on Social Media Platforms (Flutter-FFMPEG)

  29 avril 2022, par Raj Dhakad

  I am using Flutter-FFMPEG a Flutter library based on Mobile FFMPEG. I am creating a video from a list of .bmp images. The video works plays normally in devices media player on android or desktop.

  


  But when I tried to share that video on social media like say Instagram it says file format not supported.

  


  It didn't use to work on WhatsApp but after some googling, I made some changes and it works on WhatsApp and Youtube now but not on Instagram, Linkedin, etc.

  


  void _runFFmpeg() async {
    print('Run FFMPEG');
   
    var dir = await getApplicationDocumentsDirectory();
    var output = await getExternalStorageDirectory();
    String videoSize = '$ImageWidth:$ImageSize';
    print("${ImageWidth}x$ImageSize");
    var arguments = [
      "-y", // replace output file if it already exists
      "-i", "${output.path}/frame_%d.bmp",
       
      "-s", '${ImageWidth}x$ImageSize',
      "-framerate", "30", // framrate
      
      "-c:v", "libvpx",
      
      '-ab', '128k',
      '-ar', '44100',
      '-strict', 'experimental',
     
      "-vcodec", "libx264",

      "-pixel_format", "yuv420p",

      "-preset", "ultrafast",

      "-tune", "animation",

      "${output.path}/test.mp4"
    ];
   
    await _flutterFFmpeg.executeWithArguments(arguments).then((rc) {
      print('Process done with $rc');
      
    });


  


  


  


  • The plugin I am using (Flutter-FFMPEG) didn't support libx264

    


  


  • I tried using '-profile:v' to baseline but that gives an error, saying Error setting profile to baseline.

    


  


  • Also, I tried to first make a .webm file and then convert that to mp4. I was also able to use '-profile:v' when converting .webm to mp4 and gave no error but the output video didn't work on Social Media platforms.

    


  


  


  


• How to manipulate large media files in Node.js in a non-blocking way

  26 août 2017, par Jacob Prud'homme

  I am currently creating a Node.js app that receives an audio/video stream, writes it progressively to the disk, then transcodes it with ffmpeg once the stream has ended and sends it somewhere else to be stored, deleting it locally.

  Besides the fact that I can transcode the stream before writing it to streamline the entire thing (this feature is planned), what is the best way to handle these operations on potentially large files ?

  I am aware of spawing child processes (the method I’m currently using), but I’m not sure how they actually function, even after much reading. I’m not even sure using "spawn" is exactly what I want here (is "fork" a better option ?).

  Essentially, I want to know how to transcode -> upload -> delete the file without blocking Node.js so that multiple users can do the same thing simultaneously. Also, I am thinking of putting all 3 operations in a single bash script so that they happen synchronously in sequential order, is this fine ?