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• How can I use CMD to create a subfolder in a folder and move every 10 files created there ?

  12 août 2023, par Mikhail Eliseev

  There is a cmd code (see code below). You can't do it in Powershell for I need it in cmd. This code with ffmpeg software slices the video into pieces. The point is, before ffmpeg works I create command MD folder result_%%i and put there for each processed file ALL results (video files) of ffmpeg processing : result_%%i/%%i%03d.mp4

  


  Question : How to create a subfolder in the folder for each of 10 output slices and put them there ? Respectively so, there will be several subfolders in the result_%%i folder.

  


  The subfolder should be numbered as result_1_%%i , for example. Thus, the full path to any file will look like this : result_%%i/result_1_%%i/%%i%03d.mp4

  


  @echo off
for %%i in (*.mov) do (
  MD result_%%i
  ffmpeg -i "%%i" -filter_complex "[0:v]boxblur=40,scale=1080x1920,setsar=1[bg];[0:v]scale=1080:1920:force_original_aspect_ratio=decrease[fg];[bg][fg]overlay=y=(H-h)/2" -c:v libx264 -profile:v main -level:v 3.0 -x264-params scenecut=0:open_gop=0:min-keyint=72:keyint=72 -c:a aac -preset slow -crf 23 -r 30 -sn -force_key_frames "expr: gte(t, n_forced * 0.5)" -f segment -segment_time 14.5 -reset_timestamps 1 result_%%i/%%i%%03d.mp4

)

pause


  


• Trouble building ffmpeg with cuda for windows 32 with visual studio 2022

  27 juillet 2022, par manou

  Here is my building process

  


  I open mingw32 from the x64 Native Tools Command Prompt for VS 2022

  


  then in the mingw32 shell :

  


  # cd /
# ./c/Program\ Files/Microsoft\ Visual\ Studio/2022/Community/VC/Auxiliary/Build/vcvars32.bat
# cd ~
# pacman -Sy diffutils git make gcc yasm pkg-config --noconfirm
# git clone --depth 1 https://git.ffmpeg.org/ffmpeg.git ffmpeg 
# git clone https://git.videolan.org/git/ffmpeg/nv-codec-headers.git nv-codec-headers 
# cd nv-codec-headers/
# make PREFIX=/usr/local
# make install PREFIX=/usr/local
# cd ..
# mkdir nv_sdk
# cp -r /c/Program\ Files/NVIDIA\ GPU\ Computing\ Toolkit/CUDA/v11.7/lib/Win32/* nv_sdk
# cp -r /c/Program\ Files/NVIDIA\ GPU\ Computing\ Toolkit/CUDA/v11.7/include/* nv_sdk
# export PATH="/c/Program Files/Microsoft Visual Studio/2022/Community/VC/Tools/MSVC/14.32.31326/bin/Hostx86/x86/":$PATH
# export PATH="/c/Program Files/NVIDIA GPU Computing Toolkit/CUDA/v11.7/bin/":$PATH
# ./configure --disable-everything --enable-decoder=h264 --enable-decoder=hevc --enable-cross-compile --disable-avdevice --disable-swresample --disable-postproc --disable-avfilter --target-os=mingw32 --enable-cuda-nvcc --enable-nonfree --toolchain=msvc --extra-cflags=-I../nv_sdk --extra-ldflags=" -m32 -L../nv_sdk" --enable-shared --shlibdir=SHARED_LIBS --arch=x86_32 --enable-runtime-cpudetect --enable-w32threads
# make -j8
# make install


  


  first I have a bunch of warnings during the making looking like that :
libavutil/opt.c(1075): warning C4133: 'fonction' : types incompatibles - de 'AVPixelFormat *' à 'int *'

  


  And finally the make install returns :

  


  EXTERN_PREFIX="_" AR="lib.exe" NM="dumpbin.exe -symbols" ./compat/windows/makedef libavutil/libavutil.ver libavutil/adler32.o libavutil/aes.o libavutil/aes_ctr.o libavutil/audio_fifo.o libavutil/avsscanf.o libavutil/avstring.o libavutil/base64.o libavutil/blowfish.o libavutil/bprint.o libavutil/buffer.o libavutil/camellia.o libavutil/cast5.o libavutil/channel_layout.o libavutil/color_utils.o libavutil/cpu.o libavutil/crc.o libavutil/des.o libavutil/detection_bbox.o libavutil/dict.o libavutil/display.o libavutil/dovi_meta.o libavutil/downmix_info.o libavutil/encryption_info.o libavutil/error.o libavutil/eval.o libavutil/fifo.o libavutil/file.o libavutil/file_open.o libavutil/film_grain_params.o libavutil/fixed_dsp.o libavutil/float_dsp.o libavutil/frame.o libavutil/hash.o libavutil/hdr_dynamic_metadata.o libavutil/hdr_dynamic_vivid_metadata.o libavutil/hmac.o libavutil/hwcontext.o libavutil/hwcontext_d3d11va.o libavutil/hwcontext_dxva2.o libavutil/imgutils.o libavutil/integer.o libavutil/intmath.o libavutil/lfg.o libavutil/lls.o libavutil/log.o libavutil/log2_tab.o libavutil/lzo.o libavutil/mastering_display_metadata.o libavutil/mathematics.o libavutil/md5.o libavutil/mem.o libavutil/murmur3.o libavutil/opt.o libavutil/parseutils.o libavutil/pixdesc.o libavutil/pixelutils.o libavutil/random_seed.o libavutil/rational.o libavutil/rc4.o libavutil/reverse.o libavutil/ripemd.o libavutil/samplefmt.o libavutil/sha.o libavutil/sha512.o libavutil/slicethread.o libavutil/spherical.o libavutil/stereo3d.o libavutil/tea.o libavutil/threadmessage.o libavutil/time.o libavutil/timecode.o libavutil/tree.o libavutil/twofish.o libavutil/tx.o libavutil/tx_double.o libavutil/tx_float.o libavutil/tx_int32.o libavutil/utils.o libavutil/version.o libavutil/video_enc_params.o libavutil/x86/cpu.o libavutil/x86/cpuid.o libavutil/x86/fixed_dsp.o libavutil/x86/fixed_dsp_init.o libavutil/x86/float_dsp.o libavutil/x86/float_dsp_init.o libavutil/x86/imgutils.o libavutil/x86/imgutils_init.o libavutil/x86/lls.o libavutil/x86/lls_init.o libavutil/x86/tx_float.o libavutil/x86/tx_float_init.o libavutil/xga_font_data.o libavutil/xtea.o > libavutil/avutil-57.def
Could not create temporary library.
make: *** [ffbuild/library.mak:118: libavutil/avutil-57.dll] Error 1


  


  What am I doing wrong ?
shall I install others packets from pacman ?

  


• x264/x265 options for fast decoding while preserving quality

  18 août 2024, par user3301993

  I want to encode some videos in H264 and H265, and I would like to ask for help in order to chose the adequate options in x264/x265.

  


  

  • My first priority is video quality. Lossless would be the best quality for example

  


  • My second priority is fast decoding speed (ie : I would like faster decoding without sacrificing quality)

    

    • fast decoding for me means that the decoding machine would use less CPU resources reading the resulting video

    


    • Less RAM consumption would be a plus

    


    • Latency is not important

    


    


  


  • I don't care that much if the output file ends up bigger. Also, encoding speed is not important

  


  


  I'm aware of the option -tune fastdecode in both x264 and x265. But apparently the quality gets a bit worse using it.

  


  For x264 :

  


  -tune fastdecode is equivalent to --no-cabac --no-deblock --no-weightb --weightp 0 (My source is x264 --fullhelp)

  


  Which options preserve quality ?

  


  For x265 :

  


  -tune fastdecode is equivalent to --no-deblock --no-sao --no-weightp --no-weightb --no-b-intra (according to x265 doc)

  


  Again, which options preserve quality ?

  


  I tried to read some documentation on these options, but I'm afraid I'm too stupid to understand if they preserve quality or not.

  


  To explain further what I mean by "preserving quality" :

  


  


  I don't understand what the cabac option does exactly. But let's say for example that it adds some extra lossless compression, resulting in a smaller video file, but the decoding machine would need to do extra work to decompress the file

  


  In that case, the --no-cabac option would skip that extra compression, resulting in no loss of quality, with a bigger file size, and the decoding machine would not need to decompress the extra compression, saving CPU work on the decoding side

  


  In this scenario, I would like to add the --no-cabac option, as it speeds up decoding, while preserving quality.

  


  


  I hope I could get my point across

  


  Can anyone help me pick the right options ?

  


  Thanks in advance