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• How a video template can be used to replace with custom images/text on-the-fly using PHP

  8 novembre 2015, par Aamir Siddique

  I am a website developer (php) and I have been given a task to develop a website similar to
  http://ivipid.com/.

  I need to make an identical website and I am trying to figure out how this can be done,
  especially the part in which they use user-uploaded image files and text into the Video file and all this on-the-fly ?

  I know how to convert user-uploaded video files into FLV on-the-fly using FFMPEG but I’m not sure on how they (ivipid.com) manage to do this.

• ffmpeg custom audio mixing filter

  27 novembre 2016, par esposito

  I need to mix 2 files : A and B and the result is part of file A and part of File B.

  In detail I like that the output is the sum of the upper part of the file A and the lower part of file B.

  I need something like this :

  ffmpeg -i A.flac -i B.flac -af "copy all from 0 to -25 dB from 'A', copy all from -25dB to -infinite from file 'B' and put these 2 parts on the output" output.flac

  -25dB is variable that I can adjust, I like to keep the volume of file ’A’.

  In short I like to replace the soft background of file ’A’ with file ’B’.

  there is a way to do this ?

  thank you !!!!

• Parsing custom track data from ARCore mp4 recordings

  11 juillet 2022, par George Ellickson

  I'm using the Android ARCore Recording API to record custom data per frame and replay those values in tests to instrument test our ARCore functionality on devices and in CI. However, separately I'd also like to parse the generated mp4 recordings myself, outside of ARCore, and use my per frame recorded data for analysis. In my ARCore app, I'd like to simply be able to add custom text data like following, encoded as utf-8 strings (or really any other simple encoding) for the given ARCore frame :

  


  val data = "Hello world!"
val buffer = ByteBuffer.wrap(data.encodeToByteArray())
frame.recordTrackData(TRACK_UUID_MY_DATA, buffer


  


  I can't find any docs or good examples though of parsing the mp4 from ARCore and no luck in their arcore-android-sdk repo either. I've tried ffmpeg / ffprobe to figure out how the data is bundled into the MP4, but I'm stumped on which track to use and how best to deserialize as I'm unsure how the bytes are actually encoded under the hood.

  


  Using ffmpeg, I just get information like this about the tracks :

  


  Input #0, mov,mp4,m4a,3gp,3g2,mj2, from 'HoverCapture/ar-recording-tests/src/androidTest/res/raw/ar_recording_2_photos.mp4':
  Metadata:
    major_brand     : mp42
    minor_version   : 0
    compatible_brands: isommp42
    creation_time   : 2022-01-20T22:03:13.000000Z
  Duration: 00:00:17.12, start: 0.000000, bitrate: 26865 kb/s
  Stream #0:0[0x1](und): Video: h264 (Baseline) (avc1 / 0x31637661), yuv420p(tv, unknown/bt470bg/unknown, progressive), 1920x1080, 25615 kb/s, 28.08 fps, 29.58 tbr, 90k tbn (default)
    Metadata:
      creation_time   : 2022-01-20T22:03:13.000000Z
      handler_name    : ISO Media file produced by Google Inc. Created on: 01/20/2022.
      vendor_id       : [0][0][0][0]
  Stream #0:1[0x2](und): Data: none (mett / 0x7474656D), 18 kb/s (default)
    Metadata:
      creation_time   : 2022-01-20T22:03:13.000000Z
      handler_name    : ISO Media file produced by Google Inc. Created on: 01/20/2022.
  Stream #0:2[0x3](und): Video: h264 (Baseline) (avc1 / 0x31637661), yuv420p(tv, unknown/bt470bg/unknown, progressive), 640x480, 1929 kb/s, 28.12 fps, 29.42 tbr, 90k tbn (default)
    Metadata:
      creation_time   : 2022-01-20T22:03:13.000000Z
      handler_name    : ISO Media file produced by Google Inc. Created on: 01/20/2022.
      vendor_id       : [0][0][0][0]
  Stream #0:3[0x4](und): Data: none (mett / 0x7474656D), 18 kb/s (default)
    Metadata:
      creation_time   : 2022-01-20T22:03:13.000000Z
      handler_name    : ISO Media file produced by Google Inc. Created on: 01/20/2022.
  Stream #0:4[0x5](und): Data: none (mett / 0x7474656D), 54 kb/s (default)
    Metadata:
      creation_time   : 2022-01-20T22:03:13.000000Z
      handler_name    : ISO Media file produced by Google Inc. Created on: 01/20/2022.
  Stream #0:5[0x6](und): Data: none (mett / 0x7474656D), 54 kb/s (default)
    Metadata:
      creation_time   : 2022-01-20T22:03:13.000000Z
      handler_name    : ISO Media file produced by Google Inc. Created on: 01/20/2022.
  Stream #0:6[0x7](und): Data: none (mett / 0x7474656D), 0 kb/s (default)
    Metadata:
      creation_time   : 2022-01-20T22:03:13.000000Z
      handler_name    : ISO Media file produced by Google Inc. Created on: 01/20/2022.
  Stream #0:7[0x8](und): Data: none (mett / 0x7474656D), 6 kb/s (default)
    Metadata:
      creation_time   : 2022-01-20T22:03:13.000000Z
      handler_name    : ISO Media file produced by Google Inc. Created on: 01/20/2022.