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• errors of 'vaGetDisplay' and `vaGetDisplayDRM'

  30 août 2016, par Kindermann

  After updating my ubuntu OS from 14.04 to 16.04, I installed the ffmpeg library using the following configurations :

  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" \
  
    --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-nonfree
  
  PATH="$HOME/bin:$PATH" make
  
  make install

  It seemed to me the installation process was ok. After that, I tried to compile my own C source code with the following Makefile :

  EDITTED(adding -lva-drm -lva-x11 at line 10)

  FFMPEG_LIBS=    libavdevice                        \
  
                  libavformat                        \
  
                  libavfilter                        \
  
                  libavcodec                         \
  
                  libswresample                      \
  
                  libswscale                         \
  
                  libavutil                          \
  
  
  
  TARGET = video_analysis
  
  LIBS = -lva -lX11 -lvdpau -lm -lva-drm -lva-x11
  
  CC = gcc
  
  CFLAGS += -O2 -g -O0
  
  CFLAGS := $(shell pkg-config --cflags $(FFMPEG_LIBS)) $(CFLAGS)
  
  LDLIBS := $(shell pkg-config --libs $(FFMPEG_LIBS)) $(LDLIBS)
  
  
  
  .PHONY: default all clean
  
  
  
  default: $(TARGET)
  
  all: default
  
  
  
  OBJECTS = $(patsubst %.c, %.o, $(wildcard *.c))
  
  HEADERS = $(wildcard *.h)
  
  
  
  %.o: %.c $(HEADERS)
  
          $(CC) $(CFLAGS) -c $< -o $@
  
  
  
  .PRECIOUS: $(TARGET) $(OBJECTS)
  
  
  
  $(TARGET): $(OBJECTS)
  
      $(CC) $(OBJECTS) $(LDLIBS) $(LIBS) -o $@
  
  
  
  clean:
  
      -rm -f *.o
  
      -rm -f $(TARGET)

  However, my compiler complained the following errors :

  /root/ffmpeg_build/lib/libavutil.a(hwcontext_vaapi.o): In function `vaapi_device_create':
  
  /home/widerstand/ffmpeg_sources/ffmpeg/libavutil/hwcontext_vaapi.c:896: undefined reference to `vaGetDisplay'
  
  /home/widerstand/ffmpeg_sources/ffmpeg/libavutil/hwcontext_vaapi.c:917: undefined reference to `vaGetDisplayDRM'
  
  collect2: error: ld returned 1 exit status
  
  Makefile:30: recipe for target 'video_analysis' failed
  
  make: *** [video_analysis] Error 1

  My question is : in which library do ’vaGetDisplay’ and `vaGetDisplayDRM’ exist ? It’s for sure that libva functions properly. I have no clue how to fix the bugs...Thank you in advance !

• How do I run a shell script through a "for" or "foreach" loop in order to batch convert ?

  28 mars 2013, par jerdiggity

  Assuming I had a bunch of videos sitting inside the directory /home/user/videos/awaiting_conversion how would I go about using cron to run a script similar to this one to batch convert each video into a different format ?

  /bin/sh -c $'nice /usr/bin/ffmpeg -i \044'\'$'/home/user/videos/awaiting_conversion/video_file_1.mp4'\'$' -s \044'\'$'480x320'\'$' -vcodec libx264 -acodec libmp3lame -ab \044'\'$'64k'\'$' -vpre fast -crf \044'\'$'30'\'$' -ar \044'\'$'22050'\'$' -f flv -y \044'\'$'/home/user/videos/converted/video_file_1.flv'\'$''

  The above script works fine for a single conversion, but :

  1. It assumes that the name of the video is static/known (which will not be the case when batch converting).
  2. It assumes that there is only one video to convert (which may or may not be the case), i.e. there's no "loop".
  3. It leaves the original file in place instead of deleting it (which is what I would want to happen to prevent duplicate conversions).

  The ultimate question would be how do I run that script for each video that exists inside /home/user/videos/awaiting_conversion, passing the file name as a variable ?

• FFpyplayer installation on Raspberry Pi 3

  2 décembre 2017, par id911

  first, I’m quite new to posting questions.

  I’m trying to install FFPyplayer on Raspberry Pi 3 for the past few weeks, and it keeps failing. I’m frustrated beyond words with myself now. If someone can lend a hand, point me in right direction or tell me what steps I’m missing, I’d be very very grateful.
  Below are the steps I followed.

  • sudo apt-get -y install libsdl2-dev libsdl2-mixer-dev python-dev
  • mkdir /ffmpeg_sources

  • export LD_LIBRARY_PATH=$LD_LIBRARY_PATH :$HOME/ffmpeg_build/lib

  • sudo apt-get -y install yasm

  • cd /ffmpeg_sources
  • wget http://www.tortall.net/projects/yasm/releases/yasm-1.3.0.tar.gz
  • tar xzf yasm-1.3.0.tar.gz
  • cd yasm-1.3.0
  • ./configure —prefix="$HOME/ffmpeg_build" —bindir="$HOME/ffmpeg_build/bin"
  • make

  • make install

  • sudo apt-get -y install nasm

  • cd /home/pi/ffmpeg_sources
  • wget http://www.nasm.us/pub/nasm/releasebuilds/2.13.01/nasm-2.13.01.tar.xz
  • tar xf nasm-2.13.01.tar.xz
  • cd nasm-2.13.01
  • ./configure —prefix="/home/pi/ffmpeg_build" ---
    bindir="/home/pi/ffmpeg_build/bin"
  • make

  • make install

  • sudo apt-get -y install libx264-dev

  • cd /ffmpeg_sources
  • wget http://download.videolan.org/pub/x264/snapshots/last_x264.tar.bz2
  • tar xjf last_x264.tar.bz2

  • cd x264-snapshot*

  • PATH="$HOME/ffmpeg_build/bin :$PATH" ./configure —prefix="$HOME/ffmpeg_build" —bindir="$HOME/ffmpeg_build/bin" —enable-shared —extra-cflags="-fPIC" ;

  • PATH="$HOME/ffmpeg_build/bin :$PATH" make

  • make install

  • sudo apt-get -y install libmp3lame-dev

  • sudo apt-get -y install nasm
  • cd /ffmpeg_sources
  • wget http://downloads.sourceforge.net/project/lame/lame/3.99/lame-3.99.5.tar.gz
  • tar xzf lame-3.99.5.tar.gz
  • cd lame-3.99.5
  • ./configure —prefix="$HOME/ffmpeg_build" —enable-nasm —enable-shared
  • make

  • make install

  • sudo apt-get -y install libass-dev libfreetype6-dev libtheora-dev libvorbis-dev

  • cd /ffmpeg_sources
  • wget http://ffmpeg.org/releases/ffmpeg-snapshot.tar.bz2
  • tar xjf ffmpeg-snapshot.tar.bz2

  • cd ffmpeg

  • PATH="$HOME/ffmpeg_build/bin :$PATH" -
    PKG_CONFIG_PATH="$HOME/ffmpeg_build/lib/pkgconfig" ./configure —prefix="$HOME/ffmpeg_build" —extra-cflags="-I$HOME/ffmpeg_build/include -fPIC" —extra-ldflags="-L$HOME/ffmpeg_build/lib" —bindir="$HOME/ffmpeg_build/bin" —enable-gpl —enable-libass —enable-libfreetype —enable-libmp3lame —enable-libtheora —enable-libvorbis —enable-libx264 —enable-shared ;

  • PATH="$HOME/ffmpeg_build/bin :$PATH" make

  • make install

  • pip install —upgrade cython nose

  • pip install ffpyplayer

  Reference I used :

  http://matham.github.io/ffpyplayer/installation.html