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• 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

  


• FFMPEG write to openEXR grayscale channel 32 bit float (Z pass)

  31 mars 2022, par Chryfi

  I have a byte buffer with image data, or to be precise, with depth data in floats. If I understand the openEXR specification correctly, it supports 32 bit floats for one pixel, so I create a byte buffer with the size of width * height * 4 which I output to FFmpeg.

  


  I want to export the data to a layer named "Z" in openEXR. These arguments -f rawvideo -pix_fmt grayf32be -s %WIDTH%x%HEIGHT% -r %FPS% -i - -vf %DEFVF% -preset ultrafast -tune zerolatency -qp 6 %NAME%_depth_%d.exr (the %...% get replaced by the programme later) export them to no layer (i.e. default layer) and every programme where I checked the image appears green i.e. the 32 bits are stored in the green channel or some information is missing to let programmes know that it's a one channel layer.

  


  How can I achieve a proper depth pass in openEXR with FFMPEG ?

  


• net core and video transcoding on aws lambda

  14 septembre 2022, par user1765862

  I'm looking for a solution to :

  


  

  1. upload video to s3 bucket

  


  2. after video upload an aws lambda function will be triggered

  


  3. lambda function will use ffmpeg layer in order to transcode video (mainly cropping with other functionalities)

  


  4. save result (transcoded video into s3 bucket)

  


  


  My language of choice inside lambda is c# and net core runtime.

  


  I have found various resources for video manipulation with aws ffmpeg layer using lambda function but no examples in net core lambda.

  


  My question is :

  


  


  Can I use existing FFmpeg/FFprobe Lambda Layer for Amazon Linux such
as this one with lambda function written in c# and .net core ?

  


  


  Another question :

  


  


  Would you suggest Amazon Elastic Transcoder as a better choice with
lambda function .net core integration ?