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• avcodec/utils : Improve check for freeing codec private options

  24 septembre 2020, par Andreas Rheinhardt

  avcodec/utils : Improve check for freeing codec private options
  Don't check for AVCodec.priv_data_size (which is always true if
  
  AVCodec.priv_class is set). Instead check for AVCodecContext.priv_data
  
  to actually exist.
  (Note : av_opt_free(NULL) is a no-op.)
  Signed-off-by : Andreas Rheinhardt <andreas.rheinhardt@gmail.com>
  

  • [DH] libavcodec/utils.c

• Got an error when I build WebRTC with rtc_use_h264=true

  28 mai 2021, par Chaos Lucas

  Got an error when I build WebRTC.

  



  This is my build args

  



  INFO:root:Building WebRTC with args: target_os="ios" ios_enable_code_signing=false 
use_xcode_clang=true is_component_build=false is_debug=false is_component_build=false 
rtc_include_tests=false rtc_enable_protobuf=false use_rtti=true use_custom_libcxx=false 
rtc_use_h264=true ffmpeg_branding="Chrome" is_debug=false target_cpu="arm64" 
ios_deployment_target="10.0" rtc_libvpx_build_vp9=true enable_ios_bitcode=false 
use_goma=false enable_dsyms=true enable_stripping=true


  



  Full error log :

  



  INFO:root:Building target: framework_objc
ninja: Entering directory `/webrtc-checkout/src/out_ios_libs/arm64_libs'
[85/168] LIBTOOL-STATIC obj/third_party/ffmpeg/libffmpeg_internal.a
FAILED: obj/third_party/ffmpeg/libffmpeg_internal.a
rm -f obj/third_party/ffmpeg/libffmpeg_internal.a && TOOL_VERSION=1592470677 python ../../build/toolchain/mac/filter_libtool.py /Applications/Xcode.app/Contents/Developer/Toolchains/XcodeDefault.xctoolchain/usr/bin/libtool -static -D  -o obj/third_party/ffmpeg/libffmpeg_internal.a -filelist obj/third_party/ffmpeg/libffmpeg_internal.a.rsp
fatal error: /Applications/Xcode.app/Contents/Developer/Toolchains/XcodeDefault.xctoolchain/usr/bin/libtool: file list file: obj/third_party/ffmpeg/libffmpeg_internal.a.rsp is empty


  


• How to use FFmpeg Colorspace Options

  13 octobre 2024, par Matt McManis

  I'm trying to understand the difference between Colorspace FFmpeg arguments :

  


  

  • Normal option, -colorspace bt709

  


  • Number, -colorspace 1

  


  • Codec Params -x264-params "colorspace=bt709"

  


  • Filter -vf "colorspace=bt709"

  


  


  The Colorspace categories are :

  


  

  • all

  


  • iall

  


  • colorspace

  


  • transfer

  


  • primaries

  


  • color range

  


  • color matrix

  


  


  ---

  


  Question

  


  When should each be used when encoding from raw, or transcoding/converting from one format to another ? Such as mpg to mp4.

  


  Do I need to specify the input colorspace or will FFmpeg auto-detect ?

  


  ---

  


  Problems

  


  There is no -vp8-params, only -x264-params. Should I use normal options or -vf instead for vp8 and other codecs ?

  


  ---

  


  Errors

  


  


  • There are no Normal -all or -colormatrix options, but there are all= and colormatrix= for -x264-params and -vf.

    


  


  • With Codec Params -x264-params "colorspace=bt709", I get Error parsing option 'colorspace = bt709'.
    
However colorprim=bt709, transfer=bt709, colormatrix=bt709 all work.

    


  


  


  ---

  


  Resources

  


  https://ffmpeg.org/ffmpeg-filters.html#colormatrix
  
https://ffmpeg.org/ffmpeg-filters.html#colorspace
  
https://trac.ffmpeg.org/wiki/colorspace