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• Converting avi to mp4 (use ffmpeg library) is very slow

  7 décembre 2012, par yAnTar

  I have task - convert any video from user to mp4 format.
  I use command

  ffmpeg -i $file -vcodec libx264 -vpre ultrafast -bt 500k -acodec libfaac -ab 56k -ac 2 -s 480x320 $outputFileMp4

  I try to change options bitrate, dimensions, but spped of converting is slow - 3 mbytes convert arround 90 seconds.

  If i convert avi to flv - no problem.

  FFmpeg version 0.6.5, Copyright (c) 2000-2010 the FFmpeg developers
  
    built on Jan 29 2012 17:52:15 with gcc 4.4.5 20110214 (Red Hat 4.4.5-6)
  
    configuration: --prefix=/usr --libdir=/usr/lib64 --shlibdir=/usr/lib64 --mandir=/usr/share/man --incdir=/usr/include --disable-avisynth --extra-cflags='-O2 -g -pipe -Wall -Wp,-D_FORTIFY_SOURCE=2 -fexceptions -fstack-protector --param=ssp-buffer-size=4 -m64 -mtune=generic -fPIC' --enable-avfilter --enable-avfilter-lavf --enable-libdc1394 --enable-libdirac --enable-libfaac --enable-libfaad --enable-libfaadbin --enable-libgsm --enable-libmp3lame --enable-libopencore-amrnb --enable-libopencore-amrwb --enable-librtmp --enable-libschroedinger --enable-libspeex --enable-libtheora --enable-libx264 --enable-gpl --enable-nonfree --enable-postproc --enable-pthreads --enable-shared --enable-swscale --enable-vdpau --enable-version3 --enable-x11grab
  
    libavutil     50.15. 1 / 50.15. 1
  
    libavcodec    52.72. 2 / 52.72. 2
  
    libavformat   52.64. 2 / 52.64. 2
  
    libavdevice   52. 2. 0 / 52. 2. 0
  
    libavfilter    1.19. 0 /  1.19. 0
  
    libswscale     0.11. 0 /  0.11. 0
  
    libpostproc   51. 2. 0 / 51. 2. 0
  
  Input #0, avi, from 'intro.avi':
  
    Duration: 00:07:48.53, start: 0.000000, bitrate: 244 kb/s
  
      Stream #0.0: Video: camtasia, bgr24, 800x600, 15 tbr, 15 tbn, 15 tbc
  
      Metadata:
  
        strn            : Camtasia Producer_render549ab1f.avi Video #1
  
      Stream #0.1: Audio: pcm_s16le, 12000 Hz, 1 channels, s16, 192 kb/s
  
      Metadata:
  
        strn            : Microsoft Waveform: Camtasia Producer_render549ab1f.wav
  
  [libx264 @ 0x1202e40]using cpu capabilities: MMX2 SSE2Fast SSSE3 FastShuffle SSE4.1 Cache64
  
  [libx264 @ 0x1202e40]profile Constrained Baseline, level 2.2
  
  [libx264 @ 0x1202e40]264 - core 107 - H.264/MPEG-4 AVC codec - Copyleft 2003-2010 - http://www.videolan.org/x264.html - options: cabac=0 ref=1 deblock=0:0:0 analyse=0x1:0 me=dia subme=0 psy=1 psy_rd=0.00:0.00 mixed_ref=0 me_range=16 chroma_me=1 trellis=0 8x8dct=0 cqm=0 deadzone=21,11 fast_pskip=1 chroma_qp_offset=0 threads=1 sliced_threads=0 nr=0 decimate=1 interlaced=0 constrained_intra=0 bframes=0 weightp=0 keyint=250 keyint_min=25 scenecut=0 intra_refresh=0 rc=abr mbtree=0 bitrate=200 ratetol=2.5 qcomp=0.60 qpmin=10 qpmax=51 qpstep=4 ip_ratio=1.41 aq=0
  
  Output #0, mp4, to 'test2.mp4':
  
    Metadata:
  
      encoder         : Lavf52.64.2
  
      Stream #0.0: Video: libx264, yuv420p, 640x480, q=10-51, 200 kb/s, 15 tbn, 15 tbc
  
      Metadata:
  
        strn            : Camtasia Producer_render549ab1f.avi Video #1
  
      Stream #0.1: Audio: libfaac, 12000 Hz, 2 channels, s16, 5 kb/s
  
      Metadata:
  
        strn            : Microsoft Waveform: Camtasia Producer_render549ab1f.wav
  
  Stream mapping:
  
    Stream #0.0 -> #0.0
  
    Stream #0.1 -> #0.1

  and result of executing

  frame= 7028 fps= 52 q=10.0 Lsize=    2654kB time=468.31 bitrate=  46.4kbits/s
  
  video:1883kB audio:672kB global headers:0kB muxing overhead 3.876805%
  
  [libx264 @ 0xe1ee40]frame I:29    Avg QP:10.83  size: 25781
  
  [libx264 @ 0xe1ee40]frame P:6999  Avg QP:10.08  size:   169
  
  [libx264 @ 0xe1ee40]mb I  I16..4: 80.1%  0.0% 19.9%
  
  [libx264 @ 0xe1ee40]mb P  I16..4:  0.2%  0.0%  0.0%  P16..4:  0.2%  0.0%  0.0%  0.0%  0.0%    skip:99.6%
  
  [libx264 @ 0xe1ee40]final ratefactor: 5.71
  
  [libx264 @ 0xe1ee40]coded y,uvDC,uvAC intra: 37.1% 3.3% 3.1% inter: 0.1% 0.0% 0.0%
  
  [libx264 @ 0xe1ee40]i16 v,h,dc,p: 87% 12%  1%  0%
  
  [libx264 @ 0xe1ee40]i4 v,h,dc,ddl,ddr,vr,hd,vl,hu: 20% 23% 27%  8%  6%  3%  3%  2%  8%
  
  [libx264 @ 0xe1ee40]i8c dc,h,v,p: 94%  6%  0%  0%
  
  [libx264 @ 0xe1ee40]kb/s:32.91

• FFmpeg : Create a Video Slideshow from PNG Images for MS PowerPoint

  20 septembre 2016, par Klaidonis

  I am using FFmpeg on Windows 7 to create a video from PNG image sequence for Microsoft PowerPoint.

  The best results I have achieved so far, is by using the following command :

  ffmpeg -framerate 10 -start_number 3 -i .\folder\name_%d.png -q:v 0 -c:v libx264 -pix_fmt yuv420p output-video.avi

  It seems perfect, 50 images of total size 30 MB are converted into 200 KB video with no loss in the quality. Placing it in PowerPoint also seems right, but there is a slight color shift (yellow appears darker and possibly more orangish). By using some other conversion options, I obtained a video in PowerPoint where the first image of the video (like album cover art) is exactly as the original but the rest of the video plays with the mentioned color shift.

  When I play this file in VLC, it’s good. Although, if in the settings "Use hardware YUV->RGB conversions" is enabled, colors appear a bit washed out, and white color is a bit gray.

  I also tried to convert the images to a GIF file and at first it seems good but outer edges and numbers from the left and top side are blurred, and the background has turned from white to a bit gray color, although, white segments not on the background are white. The output size is 18 MB. I ended up with a way better GIF 600 KB by converting from the first video file ; just it is slightly more dotted, and the background again is grayish.

  ffmpeg -i output-video.avi output-video.gif

  Could someone help ?

• 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 ?