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• Compile ffmpeg for WinRT with libvpx ?

  7 janvier 2018, par Sean O'Neil

  Following this guide :
  https://trac.ffmpeg.org/wiki/CompilationGuide/WinRT

  Can anyone tell me if it’s possible to build and include libvpx into this ?

• ffmpeg - How to change the filter-paramaters depending on time oder framenumber ?

  2 mars 2020, par LookAndSee

  Hallo to all userse and helpers here in this forum ! Thank you, i am new and i have found allready a lot of solutions.

  Now I want to ask, if someone can help me :

  I have a Movie about 30 seconds made of 1 image.
  Now I want to pixelate depending on time or framenumber - every time a litlle bit less.
  My code so far :

  ffmpeg -i in.mp4 -vf scale=iw/n:ih/n,scale=niw:nih:flags=neighbor out.mp4

  where n should be the framenumber 1 to 900.
  this scould also be t+1 for slower change.

  the stars are gone - so i mean n times iw:n times ih :

  error-massage :

  undefined constant or missing ’(’ in ’n’
  error when evaluating the expression ’ih/n’
  maybe the expression for out_w :’w/n’ or for out_h :’ih/n’ is self-referencing.
  failed to configure output pad on paresed_scale_0
  error reinitializing filters !
  failed to inject frame into filter network : invalid argument
  error while processing the decoded data for stream #0:0

  Do you have some suggestion plaese - Thank you in Advance

• Compiling ffmpeg with an output device (decklink)

  18 avril 2018, par ddibiase

  I’ve gone through the ffmpeg compile tutorial and have managed to get it working as expected. The build looks stable and usable. However now I need to include the Blackmagick Decklink SDK in the build using the —enable-decklink flag.

  cd ~/ffmpeg_sources && \
  
  wget -O ffmpeg-snapshot.tar.bz2 https://ffmpeg.org/releases/ffmpeg-snapshot.tar.bz2 && \
  
  tar xjvf ffmpeg-snapshot.tar.bz2 && \
  
  cd ffmpeg && \
  
  PATH="$HOME/bin:$PATH" PKG_CONFIG_PATH="$HOME/ffmpeg_build/lib/pkgconfig" ./configure \
  
    --prefix="$HOME/ffmpeg_build" \
  
    --pkg-config-flags="--static" \
  
    --extra-cflags="-I$HOME/ffmpeg_build/include" \
  
    --extra-ldflags="-L$HOME/ffmpeg_build/lib" \
  
    --extra-libs="-lpthread -lm" \
  
    --bindir="$HOME/bin" \
  
    --enable-gpl \
  
    --enable-libass \
  
    --enable-libfdk-aac \
  
    --enable-libfreetype \
  
    --enable-libmp3lame \
  
    --enable-libopus \
  
    --enable-libtheora \
  
    --enable-libvorbis \
  
    --enable-libvpx \
  
    --enable-libx264 \
  
    --enable-libx265 \
  
    --enable-decklink \
  
    --enable-nonfree && \
  
  PATH="$HOME/bin:$PATH" make && \
  
  make install && \
  
  hash -r

  However after a few seconds it fails and reports that it cannot find the decklink libs :

  ERROR: DeckLinkAPI.h not found
  
  
  
  If you think configure made a mistake, make sure you are using the latest
  
  version from Git.  If the latest version fails, report the problem to the
  
  ffmpeg-user@ffmpeg.org mailing list or IRC #ffmpeg on irc.freenode.net.
  
  Include the log file "ffbuild/config.log" produced by configure as this will help
  
  solve the problem.

  I’ve placed the libraries in the same folder specified by extra-cflags and in the ldflags. So basically the Decklink SDK is available here and here :

  ~/ffmpeg_build/include/decklink
  
  ~/ffmpeg_build/lib/decklink

  That’s not apparently how you do it though. I’m wondering where I should be putting the SDK source to ensure the compiler can read it.