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• Python FFmpeg : Setting VBR and BT.709

  14 décembre 2019, par Cryptonaut

  I’m using this Python library to programmatically generate a short video using an image (.png) as input. The video needs to match the specifications of another video created by someone else.

  The key differences between my output and the other are the following (these are the media attributes I desire to have) :

  • BitRate_Mode : VBR
  • colour_primaries : BT.709 (Solved via the comment made by Rotem - updated my code example to include the solution)

  How would I achieve VBR ? It was my understanding ProRes 422 HQ natively used unconstrained VBR yet my output specifies CBR.

  Secondly, as can be seen from my code, I’m attempting to conform to BT.709. However, my media information output does not specify this. What am I doing incorrectly ?

  Here’s my code :

      image = ffmpeg.input(input_image, t='00:00:10', framerate='24000/1001', loop='1', probesize='42M')
  
  
  
      output = ffmpeg.output(image, output_video,
  
      f='mov',
  
      vcodec='prores_ks',
  
      vprofile='3',
  
      pix_fmt='yuv422p10le',
  
      g='48',
  
      video_track_timescale='24000',
  
      movflags='use_metadata_tags',
  
      timecode='00:00:00:00',
  
      color_primaries='bt709',
  
      color_trc='bt709',
  
      colorspace='bt709',
  
      qcomp='1',
  
      # BT.709 issue solved by adding the bsf option as seen via the line below
  
      bsf='prores_metadata=color_primaries=bt709:color_trc=bt709:colorspace=bt709', 
  
      vf='scale=in_range=full:in_color_matrix=bt709:out_range=full:out_color_matrix=bt709')
  
  
  
      output.run()

  Here’s the media information produced by my output :

  {
  
     "media":{
  
        "@ref":"Redacted",
  
        "track":[
  
           {
  
              "@type":"General",
  
              "VideoCount":"1",
  
              "OtherCount":"1",
  
              "FileExtension":"mov",
  
              "Format":"MPEG-4",
  
              "Format_Profile":"QuickTime",
  
              "CodecID":"qt  ",
  
              "CodecID_Version":"0000.02",
  
              "CodecID_Compatible":"qt  ",
  
              "FileSize":"196366623",
  
              "Duration":"10.010",
  
              "OverallBitRate":"156936362",
  
              "FrameRate":"23.976",
  
              "FrameCount":"240",
  
              "StreamSize":"2463",
  
              "HeaderSize":"28",
  
              "DataSize":"196364172",
  
              "FooterSize":"2423",
  
              "IsStreamable":"No",
  
              "File_Created_Date":"UTC 2019-12-13 19:26:37.150",
  
              "File_Created_Date_Local":"2019-12-13 19:26:37.150",
  
              "File_Modified_Date":"UTC 2019-12-13 19:27:20.303",
  
              "File_Modified_Date_Local":"2019-12-13 19:27:20.303"
  
           },
  
           {
  
              "@type":"Video",
  
              "StreamOrder":"0",
  
              "ID":"1",
  
              "Format":"ProRes",
  
              "Format_Version":"0",
  
              "Format_Profile":"422 HQ",
  
              "CodecID":"apch",
  
              "Duration":"10.010",
  
              "BitRate_Mode":"CBR",
  
              "BitRate":"156934237",
  
              "Width":"1920",
  
              "Height":"1080",
  
              "Sampled_Width":"1920",
  
              "Sampled_Height":"1080",
  
              "PixelAspectRatio":"1.000",
  
              "DisplayAspectRatio":"1.778",
  
              "Rotation":"0.000",
  
              "FrameRate_Mode":"CFR",
  
              "FrameRate":"23.976",
  
              "FrameCount":"240",
  
              "ColorSpace":"YUV",
  
              "ChromaSubsampling":"4:2:2",
  
              "ScanType":"Progressive",
  
              "Delay":"0.000",
  
              "StreamSize":"196364160",
  
              "Encoded_Library":"Lavc",
  
              "colour_description_present":"Yes",
  
              "colour_description_present_Source":"Stream",
  
              "colour_primaries_Source":"Stream",
  
              "transfer_characteristics_Source":"Stream",
  
              "matrix_coefficients_Source":"Stream"
  
           },
  
           {
  
              "@type":"Other",
  
              "StreamOrder":"1",
  
              "ID":"2",
  
              "Type":"Time code",
  
              "Format":"QuickTime TC",
  
              "Duration":"10.010",
  
              "FrameRate":"23.976",
  
              "TimeCode_FirstFrame":"00:00:00:00",
  
              "TimeCode_Striped":"Yes",
  
              "Language":"en",
  
              "Default":"No"
  
           }
  
        ]
  
     }
  
  }

  Here’s the media information spec I’m trying to match :

  {
  
     "media":{
  
        "@ref":"Redacted",
  
        "track":[
  
           {
  
              "@type":"General",
  
              "VideoCount":"1",
  
              "OtherCount":"1",
  
              "FileExtension":"mov",
  
              "Format":"MPEG-4",
  
              "Format_Profile":"QuickTime",
  
              "CodecID":"qt  ",
  
              "CodecID_Version":"2005.03",
  
              "CodecID_Compatible":"qt  ",
  
              "FileSize":"1397430682",
  
              "Duration":"70.737",
  
              "OverallBitRate_Mode":"VBR",
  
              "OverallBitRate":"158042403",
  
              "FrameRate":"23.976",
  
              "FrameCount":"1696",
  
              "StreamSize":"9898",
  
              "HeaderSize":"28",
  
              "DataSize":"1397420796",
  
              "FooterSize":"9858",
  
              "IsStreamable":"No",
  
              "Encoded_Date":"UTC 2019-04-29 22:26:32",
  
              "Tagged_Date":"UTC 2019-04-29 22:26:32",
  
              "File_Created_Date":"UTC 2019-12-12 16:52:57.215",
  
              "File_Created_Date_Local":"2019-12-12 16:52:57.215",
  
              "File_Modified_Date":"UTC 2019-12-12 17:25:58.903",
  
              "File_Modified_Date_Local":"2019-12-12 17:25:58.903",
  
              "Encoded_Application":"DVP Factory r561 (2019-04-25), Host: dvp07"
  
           },
  
           {
  
              "@type":"Video",
  
              "StreamOrder":"0",
  
              "ID":"1",
  
              "Format":"ProRes",
  
              "Format_Version":"0",
  
              "Format_Profile":"422 HQ",
  
              "CodecID":"apch",
  
              "Duration":"70.737",
  
              "Duration_LastFrame":"-0.000",
  
              "BitRate_Mode":"VBR",
  
              "BitRate":"158040381",
  
              "Width":"1920",
  
              "Height":"1080",
  
              "Sampled_Width":"1920",
  
              "Sampled_Height":"1080",
  
              "PixelAspectRatio":"1.000",
  
              "DisplayAspectRatio":"1.778",
  
              "Rotation":"0.000",
  
              "FrameRate_Mode":"CFR",
  
              "FrameRate":"23.976",
  
              "FrameCount":"1696",
  
              "ColorSpace":"YUV",
  
              "ChromaSubsampling":"4:2:2",
  
              "ScanType":"Progressive",
  
              "Delay":"0.000",
  
              "StreamSize":"1397420784",
  
              "Encoded_Library":"agi0",
  
              "Language":"en",
  
              "Encoded_Date":"UTC 2019-04-29 22:26:32",
  
              "Tagged_Date":"UTC 2019-04-29 22:26:32",
  
              "colour_description_present":"Yes",
  
              "colour_description_present_Source":"Container / Stream",
  
              "colour_primaries":"BT.709",
  
              "colour_primaries_Source":"Container",
  
              "colour_primaries_Original_Source":"Stream",
  
              "transfer_characteristics":"BT.709",
  
              "transfer_characteristics_Source":"Container",
  
              "transfer_characteristics_Original_Source":"Stream",
  
              "matrix_coefficients":"BT.709",
  
              "matrix_coefficients_Source":"Container / Stream"
  
           },
  
           {
  
              "@type":"Other",
  
              "StreamOrder":"1",
  
              "ID":"2",
  
              "Type":"Time code",
  
              "Format":"QuickTime TC",
  
              "Duration":"70.737",
  
              "FrameRate":"23.976",
  
              "TimeCode_FirstFrame":"00:00:00:00",
  
              "TimeCode_Striped":"Yes",
  
              "Language":"en",
  
              "extra":{
  
                 "Encoded_Date":"UTC 2019-04-29 22:26:32",
  
                 "Tagged_Date":"UTC 2019-04-29 22:26:32"
  
              }
  
           }
  
        ]
  
     }
  
  }

• Why does ffmpeg need DNS resolver as its dependencies ?

  20 décembre 2019, par Kshitij

  I was installing FFmpeg and libav today using brew install ffmpeg libav when I noticed unbound in the dependencies list.

  It’s very strange because unbound is DNS resolver and why ffmpeg would need it.

  ❯ brew install ffmpeg libav
  
  ==> Installing dependencies for ffmpeg: aom, frei0r, gmp, libtasn1, nettle, p11-kit, unbound, gnutls, lame, libass, libbluray, libsoxr, libvidstab, libvpx, opencore-amr, opus, libsndfile, libsamplerate, rubberband, sdl2, speex, giflib, leptonica, tesseract, theora, x264, x265 and xvid

  I even checked the info list for ffmpeg but unbound was not present there

  ❯ brew info ffmpeg
  
  ffmpeg: stable 4.2.1 (bottled), HEAD
  
  Play, record, convert, and stream audio and video
  
  https://ffmpeg.org/
  
  /usr/local/Cellar/ffmpeg/4.2.1_2 (287 files, 56.6MB)*
  
  - Poured from bottle on 2019-12-19 at 10:45:56
  
  From: https://github.com/Homebrew/homebrew-core/blob/master/Formula/ffmpeg.rb
  
  ==> Dependencies
  
  Build: nasm ✘, pkg-config ✔, texi2html ✘
  
  Required: aom ✔, fontconfig ✔, freetype ✔, frei0r ✔, gnutls ✔, lame ✔, libass ✔, libbluray ✔, libsoxr ✔, libvidstab ✔, libvorbis ✔, libvpx ✔, opencore-amr ✔, openjpeg ✔, opus ✔, rtmpdump ✔, rubberband ✔, sdl2 ✔, snappy ✔, speex ✔, tesseract ✔, theora ✔, x264 ✔, x265 ✔, xvid ✔, xz ✔
  
  ==> Options
  
  --HEAD
  
      Install HEAD version
  
  ==> Analytics
  
  install: 66,434 (30 days), 280,128 (90 days), 1,079,492 (365 days)
  
  install-on-request: 48,053 (30 days), 203,583 (90 days), 759,254 (365 days)
  
  build-error: 0 (30 days)

  Links for reference

  • https://formulae.brew.sh/formula/ffmpeg
  • https://formulae.brew.sh/formula/unbound

• Vcpkg building FFmpeg with libxml2

  15 décembre 2019, par Subestima

  First off all im a newbie in this area so if im asking something really stupid or non sense im sorry in advance, so lets get right to the point... im trying to add features to the ffmpeg, and by what i know i have to modify CONTROL file and portfile.cmake but as it seems its not enough i dont understand the errors and i cant get more info about this in the internet so if you could give me some info how to do it properly it would allready mean a lot to me ! i will leave the portions of code and error file

  **portfile.cmake:**
  
  if("libxml2" IN_LIST FEATURES)
  
      set(OPTIONS "${OPTIONS} --enable-libxml2")
  
  endif()
  
  
  
  **CONTROL:**
  
  Feature: libxml2
  
  Description: Libxml2 is the XML C parser and toolkit developed for the Gnome project (but usable outside of the Gnome platform)
  
  Build-Depends: zlib, libiconv, liblzma
  
  
  
  **Command Prompt after (vcpkg install ffmpeg[libxml2]:x64-windows)**
  
  CMake Error at scripts/cmake/vcpkg_execute_required_process.cmake:72 (message):
  
      Command failed: C:/vcpkg/downloads/tools/msys2/msys64/usr/bin/bash.exe --noprofile --norc C:/vcpkg/ports/ffmpeg\build.sh C:/vcpkg/buildtrees/ffmpeg/x64-windows-rel C:/vcpkg/buildtrees/ffmpeg/src/n4.2-02d8c63f80 C:/vcpkg/packages/ffmpeg_x64-windows "--enable-asm --enable-yasm --disable-doc --enable-debug --enable-runtime-cpudetect --enable-libxml2 --disable-openssl --disable-ffmpeg --disable-ffplay --disable-ffprobe --disable-libvpx --disable-libx264 --disable-opencl --disable-lzma --disable-bzlib --enable-avresample  --disable-static --enable-shared --extra-cflags=-DHAVE_UNISTD_H=0  --extra-cflags=-MD --extra-cxxflags=-MD"
  
      Working Directory: C:/vcpkg/buildtrees/ffmpeg/x64-windows-rel
  
      Error code: 1
  
      See logs for more information:
  
        C:\vcpkg\buildtrees\ffmpeg\build-x64-windows-rel-out.log
  
  
  
  Call Stack (most recent call first):
  
    ports/ffmpeg/portfile.cmake:197 (vcpkg_execute_required_process)
  
    scripts/ports.cmake:94 (include)
  
  
  
  
  
  Error: Building package ffmpeg:x64-windows failed with: BUILD_FAILED
  
  Please ensure you're using the latest portfiles with `.\vcpkg update`, then
  
  submit an issue at https://github.com/Microsoft/vcpkg/issues including:
  
    Package: ffmpeg:x64-windows
  
    Vcpkg version: 2019.09.12-nohash**strong text**
  
  
  
  **Log Error file:**
  
  === CONFIGURING === ERROR: libxml-2.0 not found using pkg-config
  
  
  
  If you think configure made a mistake, make sure you are using the latest version from Git.  If the latest version fails, report the problem to the ffmpeg-user@ffmpeg.org mailing list or IRC #ffmpeg on irc.freenode.net. Include the log file "ffbuild/config.log" produced by configure as this will help solve the problem.

  Thank you for your attention,
  Regards Pedro Cunha !