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• Extend + scale a portrait video so the aspect ratio stays and the black borders become a blurry version of the video

  24 avril 2017, par P. Dee

  I have a 720 x 1280 pixels video. How do I extend and scale it to 1920 x 1080 such that the aspect ratio is being kept and the black borders are a blurry version of the video, so you don’t really notice that it’s just a small vertical stripe.

  Example

  

  

  I started with

  ffmpeg -i video720x1280.mp4 -vf "scale=608:1080,pad=width=1920:height=1080:x=656:y=0:color=black" video1920x1080.mp4

• Lossless codec for bayer data

  21 août 2016, par vhdirk

  I’m working with lots of camera’s which capture in BG bayer pattern natively.

  Now, every time I record some data, I save it to the disk in the raw bayer pattern, in an avi container. The problem is, that this really adds up after a while. After one year of research, I have close to 4TB of data...

  So I’m looking for a lossless codec to compress this data. I know I could use libx264 (with —qp 0), or huffYUV, dirac or jpeg2000, but they all assume you have RGB or YUV data. It’s easy enough to convert the bayered data to RGB, and then compress it, but it kind of defeats the purpose of compression if you first triple the data. This would also mean that the demoasicing artefacts introduced by debayering would also be in my source data, which is also not too great. It would be nice to have a codec that can work on the bayered data directly.

  Even more nice would be that the solution would involve a codec that is already supported by gstreamer (or ffmpeg), since that’s what I am already using.

• fluent-ffmpeg is having trouble setting creation_time (metadata) for mp4 video

  26 février 2023, par LycalopX

  So, basically, I have 2000 photos/videos that are, incorrectly, saved with random creation dates, and I wish to try and organize them. And, the solution I found was : getting the correct time through their name (they are already all named correctly), in the following format :

  


  YYMMDD HH:MM:SS
  

  


  That way, as I didn't want to go one by one writing all of the correct timestamps, I tried to change the metadata for all the files using javascript, and chose Fluent-FFMPeg for the job. I have ffmpeg installed on my computer, and I can successfully change the date of an MP4 file using the following command, in Windows Powershell (for that mp4 video) :

  


  ffmpeg -i 20150408_143303.mp4 -metadata creation_time="2015-05-08T17:33:03.000Z" newFile.mp4

  

  


  But, the code I wrote doesn't seem to work, at least to change the date of the file. I tested most of the metadata fields (author, title, etc.), and it seems to work fine with them, just not the Media Creation Date (creation_time).

  


  Here is the code, for reference :

  


      // node-module
    var ffmpeg = require('fluent-ffmpeg');

    // File location
    const filePath = './'
    var fileName = "20150408_143303.mp4"


    var year = fileName.slice(0, 4)
    var month = fileName.slice(4, 6)
    var day = fileName.slice(6, 8)
    var hours = fileName.slice(9, 11)
    var minutes = fileName.slice(11, 13)
    var seconds = fileName.slice(13, 15)

    var date = new Date(year, month, day, hours, minutes, seconds)

    //2015-05-08T17:33:03.000Z
    console.log(date)


    // First try (doesn't work)
    const file = filePath + fileName
    ffmpeg(file).inputOptions(`-metadata`, `title="Movie"`)


    // ffmpeg -i 20150408_143303.mp4 -metadata creation_time="2015-05-08T17:33:03.000Z" newFile.mp4

    // second try
    ffmpeg.ffprobe(file, function(err, metadata) {

        ffmpeg(file)
        .inputFormat('mp4')
        .outputOptions([`-metadata`, `creation_time=${date}`])
        .save('newFile.mp4')
        .on("progress", function(progress) {
            console.log("Processing: " + progress.timemark);
          })
          .on("error", function(err, stdout, stderr) {
            console.log("Cannot process video: " + err.message);
          })
          .on("end", function(stdout, stderr) {
            console.log((metadata.format.tags))
          })
        .run();

    })


  


  Console.log : https://imgur.com/a/gR93xLE

  There are no console errors, and everything seems to run smoothly, but the creation_time really does not change. Any idea as to why this is occurring is very welcome...