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• Revision b02c4d364f : Increase border size from 96 to 160. This is required because upon downscaling,

  12 juillet 2013, par Ronald S. Bultje

  Changed Paths :
   Modify /vpx_scale/yv12config.h

  
  
  Increase border size from 96 to 160.

  This is required because upon downscaling, if a motion vector points
  partially into the UMV (e.g. all minus 1 of 64+7 pixels, i.e. 70),
  then we can point up to 140 pixels into the larger-resolution (2x)
  reference buffer UMV, which means the UMV for reference buffers in
  downscaling needs to be 140 rounded up to the nearest multiple of 32,
  i.e. 160.

  Longer-term, we should probably handle the UMV differently by detecting
  edge coverage on-the-fly and using a temporary buffer for edge extensions
  instead of adding 160 pixels on all sides of the image (which means a
  CIF image uses 3x its own area size for borders).

  Change-Id : I5184443e6731cd6721fc6a5d430a53e7d91b4f7e

• 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

  


• Subtract a specific string from a variable in a for loop

  14 octobre 2020, par Filip

  I am making a file converter with batch using FFMPEG.

  


  I have encountered a problem when trying to subtract the name of a file from the complete link to the file to get the directory of the folder it is in so after the file is converted it can be put into that directory.

  


  Can someone advise me on how I could subtract the string from the filename variable from the string in the directory

  


  My code :

  


  @echo off
SETLOCAL ENABLEDELAYEDEXPANSION
set filetype=.flac
for /R %%a in ("*%filetype%*") do (
    set directory=%%a
    set filename=%%~na%filetype%
    set convdir=!directory:%filename%=!
    echo !convdir!
    pause
    ffmpeg -i "%%a" "convdir%%~na.wav"
    echo Converted %%a
)
echo Convertion Done!
pause