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• I got a message "using Plots" in Julia and I do no how to resolve it

  7 septembre 2020, par Ehsan

  I am a new in Julia and after adding the Plots package I tried to use Plots and I got this Error message :

  


  julia> using Plots
[ Info: Precompiling Plots [91a5bcdd-55d7-5caf-9e0b-520d859cae80]
ERROR: LoadError: InitError: could not load library "C:\Users\niri.julia\artifacts\7350a6401f1c0d38cc3518193083bc4f83adfe99\bin\avcodec-58.dll"
The specified module could not be found.
Stacktrace:

ERROR: LoadError: Failed to precompile FFMPEG [c87230d0-a227-11e9-1b43-d7ebe4e7570a] to C:\Users\niri.julia\compiled\v1.5\FFMPEG\TGvga_Ik59J.ji.

ERROR: Failed to precompile Plots [91a5bcdd-55d7-5caf-9e0b-520d859cae80] to 


  


  can someone help me to resolve the problem

  


• build ffmpeg with my static lib "undefined reference to" [duplicate]

  7 septembre 2020, par Vassago

  exec

  


  nvcc xtest.cu -c
ar rcs libxtest.a xtest.o


  


  get libxtest.a

  


  dir : /root/work/xtest.cu /root/work/include/xtest.h /root/work/lib/libxtest.a

  


  Then I copy root/work/include/xtest.h root/work/lib/libxtest.a to /root/work/FFmpeg/libavfiler direction
And add my fuc : int test() (which is in xtest.cu) to myfilter.c

  


  next

  


  ./configure \
  --prefix="$HOME/ffmpeg_build" \
  --pkg-config-flags="--static" \
  --extra-cflags="-I/root/work/include" \
  --extra-ldflags="-L/root/work/lib" \
  --extra-libs="-lpthread -lm" \
  --bindir="$HOME/bin" \
  --enable-gpl \
  --enable-gnutls \
  --disable-libaom \
  --enable-libass \
  --disable-libfdk-aac \
  --disable-libfreetype \
  --disable-libmp3lame \
  --disable-libopus \
  --disable-libvorbis \
  --disable-libvpx \
  --enable-nonfree

make


  


  error :

  


  AR  libavfilter/libavfilter.a
LD  ffmpeg_g
libavfilter/libxtest.a(vf_colorcalc.o): In function `colorcale_filter_frame':
/root/work/FFmpeg/libavfilter/vf_colorcalc.c:166: undefined reference to `test'
collect2: error: ld returned 1 exit status
Makefile:114: recipe for target 'ffmpeg_g' failed
make: *** [ffmpeg_g] Error 1



  


  please teach me how to build static lib to FFmpeg

  


• How to fix "moov atom not found" when extracting an image from partial video mp4 file ?

  1er septembre 2020, par Epsiloncool

  I think the problem is relatively common, but I can't find any good solution to my problem.
Well, I need to create a preview of the video while it uploads. It can be a very big video, so I decided to use only the first 10 Mb of video to make image extraction with ffmpeg.

  


  The command-line looks like this

  


  ffmpeg -ss 00:00:00 -i "src.mp4" -frames:v 1 -q:v 2 "preview.jpg"

  


  It works fine for lots of video files, but for mp4 it always failed with the error message "Moov atom not found". I guess the mp4 format is not streamable and the cut file looks like a broken video for the FFmpeg.

  


  But there should be a solution to this. Could you help me ?