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• What is a correct way of ffmpeg dshow webcamera properties save and load ?

  12 juin 2020, par C0oo1D

  Command (PS == Windows PowerShell) :

  



  PS D:\> ffmpeg -f dshow -show_video_device_dialog True -video_device_save some_profile.txt -i 'video=MicrosoftR LifeCam Studio(TM)'


  



  FFmpeg Header :

  



  ffmpeg version git-2020-06-04-7f81785 Copyright (c) 2000-2020 the FFmpeg developers
  built with gcc 9.3.1 (GCC) 20200523
  configuration: --enable-gpl --enable-version3 --enable-sdl2 --enable-fontconfig --enable-gnutls --enable-iconv --enable-libass --enable-libdav1d --enable-libbluray --enable-libfreetype --enable-libmp3lame --enable-libopencore-amrnb --enable-libopencore-amrwb --enable-libopenjpeg --enable-libopus --enable-libshine --enable-libsnappy --enable-libsoxr --enable-libsrt --enable-libtheora --enable-libtwolame --enable-libvpx --enable-libwavpack --enable-libwebp --enable-libx264 --enable-libx265 --enable-libxml2 --enable-libzimg --enable-lzma --enable-zlib --enable-gmp --enable-libvidstab --enable-libvmaf --enable-libvorbis --enable-libvo-amrwbenc --enable-libmysofa --enable-libspeex --enable-libxvid --enable-libaom --disable-w32threads --enable-libmfx --enable-ffnvcodec --enable-cuda-llvm --enable-cuvid --enable-d3d11va --enable-nvenc --enable-nvdec --enable-dxva2 --enable-avisynth --enable-libopenmpt --enable-amf
  libavutil      56. 49.100 / 56. 49.100
  libavcodec     58. 90.100 / 58. 90.100
  libavformat    58. 44.100 / 58. 44.100
  libavdevice    58.  9.103 / 58.  9.103
  libavfilter     7. 84.100 /  7. 84.100
  libswscale      5.  6.101 /  5.  6.101
  libswresample   3.  6.100 /  3.  6.100
  libpostproc    55.  6.100 / 55.  6.100


  



  Error after OK/Cancel/Close in camera settings dialog (empty file was created). Also tried without dialog - the same problem :

  



  [dshow @ 0715de40] Query for IPersistStream failed.
video=Microsoft® LifeCam Studio(TM): I/O error


  



  I assume that problem at the camera side, but I don't exclude my blindness (didn’t find any examples of saving settings or required command options in the documentation).

  



  Perhaps there is another way to save / load webcamera properties ?

  


• avfilter/vf_vectorscope : support more formats for color4 mode in common case

  2 septembre 2015, par Paul B Mahol

  avfilter/vf_vectorscope : support more formats for color4 mode in common case
  Signed-off-by : Paul B Mahol <onemda@gmail.com>
  

  • [DH] libavfilter/vf_vectorscope.c
  • [DH] tests/ref/fate/filter-vectorscope_color4

• avcodec/aacps : Move initializing common stuff to aacdec_common.c

  24 septembre 2023, par Andreas Rheinhardt

  avcodec/aacps : Move initializing common stuff to aacdec_common.c
  ff_ps_init() initializes some tables for AAC parametric stereo
  
  and some of them are only valid for the fixed- or floating-point
  
  decoder, whereas others (namely VLCs) are valid for both.
  
  The latter are therefore initialized by ff_ps_init_common()
  
  and because the two versions of ff_ps_init() can be run
  
  concurrently, it is guarded by an AVOnce.
  Yet now that there is ff_aacdec_common_init_once() there is
  
  a better way to do this : Call ff_ps_init_common()
  
  from ff_aacdec_common_init_once(). That way there is no need
  
  to guard ff_ps_init_common() by an AVOnce any more.
  Signed-off-by : Andreas Rheinhardt <andreas.rheinhardt@outlook.com>
  

  • [DH] libavcodec/aacdec_common.c
  • [DH] libavcodec/aacps.c
  • [DH] libavcodec/aacps_common.c