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• Dcode time-metadata from .mov files by ffmepg or C++ libraries

  8 juillet 2021, par shortz79

  I record a .mov files from swift, by using "AVTimedMetadataGroup" to save metadata per frame (rawdata) into the track.

  


  Here is the example how I save according swift

  


          var newItem = AVMutableMetadataItem()
        newItem.identifier = AVMetadataIdentifier.quickTimeUserDataTrack
        newItem.dataType = kCMMetadataBaseDataType_RawData as String
        var newGroup = AVTimedMetadataGroup(items: [newItem], timeRange: timeRange)
        m_depth_writer_input_adap!.append(newGroup)


  


  I also copy the track data into a .bin files, but it's there any way to get the track data from linux or windows side instead from swift.

  


  Below is the log according to the ffmpeg.

  


  ffmpeg -i .\input_file.mov
      Input #0, mov,mp4,m4a,3gp,3g2,mj2, from '.\input_file.mov':
      Metadata:
        major_brand     : qt
        minor_version   : 0
        compatible_brands: qt
        creation_time   : 2021-07-06T07:24:12.000000Z
      Duration: 00:00:05.23, start: 0.000000, bitrate: 77273 kb/s
        Stream #0:0(und): Video: h264 (High) (avc1 / 0x31637661), yuvj420p(pc, smpte170m/bt709/bt709), 1920x1440, 19524 kb/s, 29.81 fps, 30 tbr, 600 tbn, 1200 tbc (default)
        Metadata:
          rotate          : 90
          creation_time   : 2021-07-06T07:24:13.000000Z
          handler_name    : Core Media Video
          encoder         : H.264
        Side data:
          displaymatrix: rotation of -90.00 degrees
        Stream #0:1(und): Data: none (mebx / 0x7862656D), 57743 kb/s (default)
        Metadata:
          creation_time   : 2021-07-06T07:24:13.000000Z
          handler_name    : Core Media Metadata


  


  (Even if it could be solve by recording with another file type(eg:mp4,mov) which swift support to save.)

  


• Introducing MatomoCamp !

  24 juin 2021, par Ben Erskine — Community
  

  MatomoCamp is the first online event developed by and for the Matomo community.

  The key purpose of MatomoCamp is to encourage knowledge-sharing, it’s all about helping and learning from each other.

  When is MatomoCamp ?

  MatomoCamp will be held on November the 4th and November the 5th 2021 from 9 A.M. to 5 P.M. CET. 

  What is a Camp ?

  The term “Camp” comes from Barcamp, which is a self-organized informal non-conference. The event takes place online by using only Free software and Open Source technologies.

  Get involved

  The MatomoCamp is designed for people from the community to come on stage to introduce topics or share their expertise about Matomo Analytics.

  If you have something you would like to share or have a speaker in mind, please submit a proposal and get involved.

  Help shape the event

  A team of passionate volunteers are in full swing developing this event. In order to make this event as valuable as possible for the community, we need your help !

  If you would like to help out or have an idea to help shape the overall event, reach out to the organizers and share your ideas.

  More updates on MatomoCamp will follow soon.

• .avi file to .webm file with alpha channel

  2 juin 2023, par Cutest

  I have no idea how to use FFmpeg, but my .avi file is too large for a 2-second video ? Any idea how I can convert it to WebM ? While retaining its alpha channel ?

  


  I tried this :

  


  ffmpeg -i "1.avi" -c:v libvpx -pix_fmt yuva420p "1.webm"


  


  Output showed :

  


  ffmpeg version 4.4-essentials_build-www.gyan.dev Copyright (c) 2000-2021 the FFmpeg developers
  built with gcc 10.2.0 (Rev6, Built by MSYS2 project)
  configuration: --enable-gpl --enable-version3 --enable-static --disable-w32threads --disable-autodetect --enable-fontconfig --enable-iconv --enable-gnutls --enable-libxml2 --enable-gmp --enable-lzma --enable-zlib --enable-libsrt --enable-libssh --enable-libzmq --enable-avisynth --enable-sdl2 --enable-libwebp --enable-libx264 --enable-libx265 --enable-libxvid --enable-libaom --enable-libopenjpeg --enable-libvpx --enable-libass --enable-libfreetype --enable-libfribidi --enable-libvidstab --enable-libvmaf --enable-libzimg --enable-amf --enable-cuda-llvm --enable-cuvid --enable-ffnvcodec --enable-nvdec --enable-nvenc --enable-d3d11va --enable-dxva2 --enable-libmfx --enable-libgme --enable-libopenmpt --enable-libopencore-amrwb --enable-libmp3lame --enable-libtheora --enable-libvo-amrwbenc --enable-libgsm --enable-libopencore-amrnb --enable-libopus --enable-libspeex --enable-libvorbis --enable-librubberband
  libavutil      56. 70.100 / 56. 70.100
  libavcodec     58.134.100 / 58.134.100
  libavformat    58. 76.100 / 58. 76.100
  libavdevice    58. 13.100 / 58. 13.100
  libavfilter     7.110.100 /  7.110.100
  libswscale      5.  9.100 /  5.  9.100
  libswresample   3.  9.100 /  3.  9.100
  libpostproc    55.  9.100 / 55.  9.100
[avi @ 00000245f2e7d640] Stream #0: not enough frames to estimate rate; consider increasing probesize
Guessed Channel Layout for Input Stream #0.1 : stereo
Input #0, avi, from '1.avi':
  Duration: 00:00:02.00, start: 0.000000, bitrate: 3983150 kb/s
  Stream #0:0: Video: rawvideo, bgra, 1920x1080, 4014784 kb/s, 60 fps, 60 tbr, 60 tbn, 60 tbc
  Stream #0:1: Audio: pcm_s16le ([1][0][0][0] / 0x0001), 48000 Hz, stereo, s16, 1536 kb/s
Stream mapping:
  Stream #0:0 -> #0:0 (rawvideo (native) -> vp8 (libvpx))
  Stream #0:1 -> #0:1 (pcm_s16le (native) -> opus (libopus))
Press [q] to stop, [?] for help
[libvpx @ 00000245f2e8ecc0] v1.10.0-24-g8b3e575a4
[libvpx @ 00000245f2e8ecc0] Neither bitrate nor constrained quality specified, using default CRF of 32 and bitrate of 256kbit/sec
[libvpx @ 00000245f2e8ecc0] Transparency encoding with auto_alt_ref does not work
Error initializing output stream 0:0 -- Error while opening encoder for output stream #0:0 - maybe incorrect parameters such as bit_rate, rate, width or height
Conversion failed!