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• ffmpeg - How to resize frame collage (grid of images) to grid of different dimensions, while respecting frame order ?

  12 mars 2023, par JamesK

  I have an input of a "frame collage" (that is, frames extracted from a video, arranged in a certain grid). I want to rearrange the frames from a collage into a different grid shape. I can calculate the input coordinates (or bounds, e.g. x.min -> x.max, y.min -> y.max) and output coordinates for each frame. Basically, I want to resize a grid, while respecting the positioning of each element of the original grid.

  


  As an example, given a frame collage that is 9x2 (9 columns wide, 2 rows tall), with image resolution of 1080x240 (width x height), resize the frame collage to be 6x3 (6 columns wide, 3 columns tall), with an image resolution of 720x480 (width x height), while respecting the order of the frames in the input image (left to right, top to bottom).

  


  I generated the frame mappings (where the original frame was located, and where the new frame should be placed) for each frame, a table of that data is available here : https://pastebin.com/raw/a5UhKhek (posted on pastebin because discord would murder the formatting).

  


  Does anyone have any ideas on how I might be able to pull this off ?

  


  I've investigated the tile and untile filter, as well as looked into the select filter, although the syntax for the lattermost is a touch confusing to me.

  


• Showing in-video visual progress bar with FFMPEG ?

  20 mai 2024, par Taapo

  As OBS Studio lacks a visual indicator to show how far a video has progressed (and when you need to advance to the next scene), I was wondering if there is a command-line option (or solution) to get FFMPEG to re-encode the video and show a progress bar at the bottom of the video that shows how long the video has been playing so far.

  


  Is there such a feature ?

  


• Split video with MobileFFmpeg

  17 septembre 2020, par Vitor Ferreira

  I need to split a video into pieces smaller than 15 seconds using ffmpeg on android.

  


  For this I am using this library to use FFmpeg and tried to use the code below, but it did not work.

  


      private val destPath = "/storage/emulated/0/DCIM/TESTFOLDER"


  


      if (video != null) {
        val command =
            "ffmpeg -i $video -c copy -map 0 -segment_time 00:00:15 -f segment $destPath output%03d.mp4"

        mProgressDialog.show()

        try {
            val executionId = FFmpeg.executeAsync(command) { _: Long, returnCode: Int ->
                when (returnCode) {
                    RETURN_CODE_SUCCESS -> {
                        mProgressDialog.dismiss()
                        Toast.makeText(
                            this,
                            "Async command execution completed successfully",
                            Toast.LENGTH_SHORT
                        ).show()
                    }
                    RETURN_CODE_CANCEL -> {
                        mProgressDialog.dismiss()
                        Toast.makeText(
                            this,
                            "Async command execution cancelled by user.",
                            Toast.LENGTH_SHORT
                        ).show()
                    }
                    else -> {
                        mProgressDialog.dismiss()
                        Toast.makeText(
                            this,
                            "Async command execution failed",
                            Toast.LENGTH_SHORT
                        )
                            .show()
                    }
                }
            }
        } catch (e: Exception) {
            e.printStackTrace()
            Toast.makeText(this, e.message, Toast.LENGTH_SHORT).show()
        }
    }


  


  I tried with video = /data/user/0/com.vitor238.videoEditor/cache/e4c9d2f3-6127-43fa-a293-e0de614f4993.mp4 and video = content://media/external/video/media/187130 but neither worked.