Newest 'ffmpeg' Questions - Stack Overflow

Les articles publiés sur le site

• Compile FFmpeg with libfdk_aac

  18 février 2017, par Toydor

  I been reading on how to convert mp3 to m4a, and found that I must compile FFmpeg if I'll use the AAC encoder, libfdk_aac.

  But reading FFmpeg guide on how to compile FFmpeg with libfdk_aac makes no sense for a beginner like me.

  To use libfdk_aac the encoding guide says:

  Requires ffmpeg to be configured with --enable-libfdk_aac --enable-nonfree.

  Where do I put those flags?

  Do I put it here somewhere?:

  cd ~/ffmpeg_sources
  git clone --depth 1 git://github.com/mstorsjo/fdk-aac.git
  cd fdk-aac
  autoreconf -fiv
  ./configure --prefix="$HOME/ffmpeg_build" --disable-shared
  make
  make install
  make distclean
  

  Or maybe here somewhere?

  cd ~/ffmpeg_sources
  git clone --depth 1 git://source.ffmpeg.org/ffmpeg
  cd ffmpeg
  PKG_CONFIG_PATH="$HOME/ffmpeg_build/lib/pkgconfig"
  export PKG_CONFIG_PATH
  ./configure --prefix="$HOME/ffmpeg_build" \
    --extra-cflags="-I$HOME/ffmpeg_build/include" --extra-ldflags="-L$HOME/ffmpeg_build/lib" \
    --bindir="$HOME/bin" --extra-libs="-ldl" --enable-gpl --enable-libass --enable-libfdk-aac \
    --enable-libmp3lame --enable-libopus --enable-libtheora --enable-libvorbis --enable-libvpx \
    --enable-libx264 --enable-nonfree --enable-x11grab
  make
  make install
  make distclean
  hash -r
  

  If I'm reading the compile guide right I guess that these two chunks of code is what I need to compile FFmpeg.

  I'm using Ubuntu server 12.4

  UPDATE

  After upgrading my system to Ubuntu 16.04 I had to install ffmpeg again. I still needed libfdk-aac. Fortunately there's a good step-by-step guide at http://trac.ffmpeg.org/wiki/CompilationGuide/Ubuntu on how to compile ffmpeg.

  I thought I would share how to compile if just interested in compiling ffmpeg with libfdk-aac and libmp3lame.

  If you haven't already a bin in home directory:

  mkdir ~/bin 
  

  Install dependencies. Didn't need the non-server packages:

  sudo apt-get update
  sudo apt-get -y install autoconf automake build-essential libass-dev libfreetype6-dev libtheora-dev libtool libvorbis-dev pkg-config texinfo zlib1g-dev 
  

  Then install the encoders. Had to install yasm as well, otherwise I got errors when compiling.

  sudo apt-get install libfdk-aac-dev
  sudo apt-get install libmp3lame-dev
  sudo apt-get install yasm
  

  Then compile ffmpeg with needed flags

  cd ~/ffmpeg_sources
  wget http://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" \
  --bindir="$HOME/bin" \
  --enable-libass \
  --enable-libfdk-aac \
  --enable-libfreetype \
  --enable-libtheora \
  --enable-libvorbis \
  --enable-libmp3lame \
  --enable-nonfree \
  --enable-gpl
  PATH="$HOME/bin:$PATH" make
  make install
  make distclean
  hash -r
  

• What is wrong with my FFMPEG command for streaming ? [duplicate]

  18 février 2017, par Muhammad Umer

  This question is an exact duplicate of:

  • FFMPEG : Conversion Failed Error when trying trying to create facebook stream from image and audio?

  I am trying to stream to Facebook by using one image, but I get

  Packets are not in the proper order with respect to DTS7kbits/s
av_interleaved_write_frame(): Invalid argument

  This is the command I am writing:

  ffmpeg \
  -re -y \
  -loop 1 \
  -f image2 \
  -i ./maxresdefault.jpg \
  -i ./audio.mp3 \
  -b:a 128k \
  -c:a aac -strict experimental \
  -vcodec libx264 \
  -g 30 \
  -r 30 \
  -f flv \
  "rtmp://rtmp-api.facebook.com:80/rtmp/..."
  

• FFmpeg hardware acceleration on Raspberry PI

  17 février 2017, par Cristian Gabor

  I am building a program that use ffmpeg to stream webcam content over internet. I would like to know if it is possible to use the GPU for the streaming part on the raspberry pi model 3. If yes, how could I implement this on ffmpeg?

• ffmpeg doesn't always create wave picture

  17 février 2017, par Sean

  @LordNeckbeard and other ffmpeg experts,

  can you please help me with generating wave picture. the following command works perfectly on some videos and it doesn't on other videos:

  ffmpeg  -i "input.mp4" -filter_complex "[0:a]aformat = channel_layouts = mono, compand = gain = -6, showwavespic = s = 1920x384: colors =red|blue[fg]; color = s = 1920x384: color =#444444, drawgrid = width = 38:height = 38:color =#555555@0.5[bg]; [bg][fg]overlay = format = rgb, drawbox = x = (iw - w) / 2:y = (ih - h) / 2:w = iw:h = 2:color =#000000@0.4" -vframes 1  "output.png" 
  

  when working, it generates the following wave pic: working example

  on other videos, it shows the grid but it seems that the wave signal is hidden behind the grid

  wave hidden behind the grid

  Your help is greatly appreciated!

  Thank you, Sean.

• How to Loop Input video x number of time using FFMPEG ?

  17 février 2017, par Hitesh Shukla

  I want to loop same video 4 times and output as video using ffmpeg. SO I create code like this in ffmpeg.

  ffmpeg -loop 4 -i input.mp4 -c copy output.mp4
  

  but when i run it it give the error like this.

  Option Loop Not Found.
  

  how to do this withour error. Please Help Me