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• avcodec/avcodec : Always use old channel count/layout if set

  18 septembre 2022, par Andreas Rheinhardt

  avcodec/avcodec : Always use old channel count/layout if set
  This ensures that if AVCodecContext.channels or
  
  AVCodecContext.channel_layout are set, AVCodecContext.ch_layout
  
  has the equivalent values after this block.
  (In case these values are set inconsistently, the consistency check
  
  for ch_layout below will error out.)
  Signed-off-by : Andreas Rheinhardt <andreas.rheinhardt@outlook.com>
  

  • [DH] libavcodec/avcodec.c

• FFMpeg command to merge 1 video and 2 audio files while also reducing volume of one audio

  26 septembre 2022, par UserM

  I need to construct a FFMpeg using amix or any equivalent command to merge 1 video and 2 audio files while also reducing volume of one background music file (ukulele.mp3).
Refer : https://ffmpeg.org/ffmpeg-filters.html#Examples-11

  


  //cmd works with out volume reduction of background music file
anima_buf = ("C:/ffmpeg/bin/ffmpeg -thread_queue_size 8192 -safe 0 -f concat -i %s -t %s -safe 0 -f concat -i %s -i ./music/ukulele.mp3\
-filter_complex amix=inputs=2:duration=shortest -c:v libx264 -profile:v high -crf 20 -pix_fmt yuv420p -y %s" % ( anima_img_file, anima_len, anima_audio_file, anima_opvideo_file))
os.system(anima_buf)
//successful

//cmd to reduce volume of background music
    anima_buf = ("C:/ffmpeg/bin/ffmpeg -thread_queue_size 8192 -safe 0 -f concat -i %s -t %s -safe 0 -f concat -i %s -i ./music/ukulele.mp3\
    -filter_complex amix=inputs=2:duration=shortest:dropout_transition=0:weights="1 0.25":normalize=0 -c:v libx264 -profile:v high -crf 20 -pix_fmt yuv420p -y %s" % ( anima_img_file, anima_len, anima_audio_file, anima_opvideo_file) )
os.system(anima_buf)
                                                                                   
SyntaxError: invalid syntax mentioned at weights="1 0.25"


  


  FFmpeg version :

  


  ffmpeg version 2022-05-23-git-6076dbcb55-full_build-www.gyan.dev Copyright (c) 2000-2022 the FFmpeg developers
built with gcc 11.3.0 (Rev1, 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-bzlib --enable-lzma --enable-libsnappy --enable-zlib --enable-librist --enable-libsrt --enable-libssh --enable-libzmq --enable-avisynth --enable-libbluray --enable-libcaca --enable-sdl2 --enable-libdav1d --enable-libdavs2 --enable-libuavs3d --enable-libzvbi --enable-librav1e --enable-libsvtav1 --enable-libwebp --enable-libx264 --enable-libx265 --enable-libxavs2 --enable-libxvid --enable-libaom --enable-libjxl --enable-libopenjpeg --enable-libvpx --enable-mediafoundation --enable-libass --enable-frei0r --enable-libfreetype --enable-libfribidi --enable-liblensfun --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-libshaderc --enable-vulkan --enable-libplacebo --enable-opencl --enable-libcdio --enable-libgme --enable-libmodplug --enable-libopenmpt --enable-libopencore-amrwb --enable-libmp3lame 
--enable-libshine --enable-libtheora --enable-libtwolame --enable-libvo-amrwbenc --enable-libilbc --enable-libgsm --enable-libopencore-amrnb --enable-libopus --enable-libspeex --enable-libvorbis --enable-ladspa --enable-libbs2b --enable-libflite --enable-libmysofa --enable-librubberband --enable-libsoxr --enable-chromaprint
libavutil      57. 25.100 / 57. 25.100
libavcodec     59. 28.100 / 59. 28.100
libavformat    59. 24.100 / 59. 24.100
libavdevice    59.  6.100 / 59.  6.100
libavfilter     8. 38.100 /  8. 38.100
libswscale      6.  6.100 /  6.  6.100
libswresample   4.  6.100 /  4.  6.100
libpostproc    56.  5.100 / 56.  5.100


  


  Can someone guide me, thanks in advance

  


• lavu/cpu : CPU flags for the RISC-V Vector extension

  26 septembre 2022, par Rémi Denis-Courmont

  lavu/cpu : CPU flags for the RISC-V Vector extension
  RVV defines a total of 12 different extensions, including :
   5 different instruction subsets :
  
    - Zve32x : 8-, 16- and 32-bit integers,
  
    - Zve32f : Zve32x plus single precision floats,
  
    - Zve64x : Zve32x plus 64-bit integers,
  
    - Zve64f : Zve32f plus Zve64x,
  
    - Zve64d : Zve64f plus double precision floats.
   6 different vector lengths :
  
    - Zvl32b (embedded only),
  
    - Zvl64b (embedded only),
  
    - Zvl128b,
  
    - Zvl256b,
  
    - Zvl512b,
  
    - Zvl1024b,
   and the V extension proper : equivalent to Zve64f and Zvl128b.
  In total, there are 6 different possible sets of supported instructions
  
  (including the empty set), but for convenience we allocate one bit for
  
  each type sets : up-to-32-bit ints (RVV_I32), floats (RVV_F32),
  
  64-bit ints (RVV_I64) and doubles (RVV_F64).
  Whence the vector size is needed, it can be retrieved by reading the
  
  unprivileged read-only vlenb CSR. This should probably be a separate
  
  helper macro if needed at a later point.
  

  • [DH] libavutil/cpu.c
  • [DH] libavutil/cpu.h
  • [DH] libavutil/riscv/cpu.c
  • [DH] tests/checkasm/checkasm.c