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• Put images on video with ffmpeg in Node.js

  27 juin 2022, par Cery

  I am creating a server-side video renderer in node.js. I need to add images on an existing video file every frame. I need to set the specific position of each frame in the rendered video. I am holding all the frames of the images in Readable. This is my code that works, but does not take into account the position of the images. How can I modify it ? Of course I have a list with images coordinates - but I don't know how to make a filter out of this.

  


  this.stream is a list of images.

  


    const filter = ["[1:v]format=argb,setpts=PTS+" + 0 + "/TB[out]",
        {
            filter: "overlay",
            options: {
                enable: "between(t," + 0 + "," + 9 + ")",
                x: "0",
                y: "0",
            },
            inputs: "[0:v][out]",
            outputs: "tmp",
        }

        ]
        const Options = [
            "-crf 16",
            "-f mp4",
            "-vcodec libx264",
            "-movflags frag_keyframe+empty_moov",
            "-pix_fmt yuv420p",
        ];

        var ffmpeg = require('fluent-ffmpeg');
        ffmpeg.setFfmpegPath(ffm.path);
        var command = ffmpeg();

        const outputStream = fs.createWriteStream(this.Path + "test.mp4");

        command.input(this.Path + "input.mp4");
        command.input(this.stream).inputFPS(23);
        command.outputOptions(Options);
        command.fps(23);

        command.complexFilter(filter, "tmp");

        command.output(outputStream);


  


• cbs_mpeg2 : Rearrange start code search

  29 juillet 2019, par Andreas Rheinhardt

  cbs_mpeg2 : Rearrange start code search
  1. Currently, cbs_mpeg2_split_fragment uses essentially three variables
  
  to hold the start code values found by avpriv_find_start_code. By
  
  rearranging the code, one of them can be omitted.
  
  2. The return value of avpriv_find_start_code points to the byte after
  
  the byte containing the start code identifier (or to the byte after the
  
  last byte of the fragment's data if no start code was found), but
  
  cbs_mpeg2_split_fragment needs to work with the pointer to the byte
  
  containing the start code identifier ; it already did this, but in a
  
  clumsy way. This has been changed.
  
  3. Also use the correct type for the variable holding the
  
  CodedBitstreamUnitType.
  Signed-off-by : Andreas Rheinhardt <andreas.rheinhardt@gmail.com>
  

  • [DH] libavcodec/cbs_mpeg2.c

• PHP ffmpeg fetch metadata missing title, author, comment, artist

  19 avril 2012, par chrismacp

  I've been trying to fetch remote mp3 (and other format) meta data using the php5-ffmpeg extension.

  It is working although I am always missing the title, author, comment, artist details.

  I've been scouring the web for an answer but not found any solution.

  I did find this patch http://cvs.pld-linux.org/cgi-bin/viewvc.cgi/cvs/packages/php-ffmpeg/tests-metadata-api.patch which I thought may solve the problem, but I've been unable to compile php-ffmpeg even without the patch so haven't been able to work out if it will fix the problem.

  It seems this extension was abandoned a couple of years ago so I'm not holding out much hope of getting this working.

  Does anyone have any ideas of how to get remote meta data from audio video files using other tools ?

  I am thinking of just parsing the output of ffmpeg itelf using the '-i' option as this does return the correct meta data. Just a bit wary of calling exec in PHP for security reasons.