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• How to use ffmpeg encode video in H.264 ?

  7 mai 2016, par seaguest

  I have installed ffmpeg 3.0 from https://github.com/FFmpeg/FFmpeg, I am trying to convert a video coded with mepeg4 part 2 to H264, but I got Unknown encoder 'libx264'
  error

  Here is my comannd : (I tried h264, x264, libx264, none of them worked)

  ffmpeg -i Fashion.divx -acodec aac -vcodec libx264  out.mp4

  I checked the list of supported codec

  Codecs:
  
   D..... = Decoding supported
  
   .E.... = Encoding supported
  
   ..V... = Video codec
  
   ..A... = Audio codec
  
   ..S... = Subtitle codec
  
   ...I.. = Intra frame-only codec
  
   ....L. = Lossy compression
  
   .....S = Lossless compression
  
   -------
  
   D.VI.. 012v                 Uncompressed 4:2:2 10-bit

  Here is h264 :

   D.V.LS h264                 H.264 / AVC / MPEG-4 AVC / MPEG-4 part 10 (decoders: h264 h264_vdpau)

  I am using ffmpeg 3.0, from that list, it seems that encoding with h264 is not supported, only decoding h264 is supported, right ?

  I tried to enable h.264 with this guide
  How to quickly compile FFmpeg with libx264 (x264, H.264)

  ./configure --enable-gpl --enable-libx264

  bu I get
  ./configure —enable-gpl —enable-libx264

  ERROR: libx264 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 "config.log" produced by configure as this will help
  
  solve the problem.

  what should I do to make encode video in h.264 work ?

• python ffmpeg subprocess not working on heroku

  21 septembre 2018, par Liam

  I’ve made a bot that deals with gif files and I tried uploading it on heroku.

  So I’ve installed this buildpack https://elements.heroku.com/buildpacks/jonathanong/heroku-buildpack-ffmpeg-latest

  And I run this code as a subprocess :

  id_name = "je4d" (is actually randomized bc it downloads different gifs)
  
  path = "./media/%s.gif" % (id_name)
  
  subprocess.run('ffmpeg -y -ignore_loop 0 -i %s -movflags faststart -pix_fmt yuv420p -vf "scale=trunc(iw/2)*2:trunc(ih/2)*2" -t 15 %s' % (path, path.replace(".gif", ".mp4")), shell=True)

  So if I run this on my computer, it will transform je4d.gif into an .mp4 and it works fine

  If I try to test ffmpeg on heroku by doing heroku run bash
  and then inputing the command ffmpeg -y -ignore_loop 0 -i ./media/je4d.gif -movflags faststart -pix_fmt yuv420p -vf "scale=trunc(iw/2)*2:trunc(ih/2)*2" -t 15 ./media/je4d.mp4
  It also works fine and makes a .mp4

  However if I run the code on heroku from python it does this :
  [Errno 2] No such file or directory: 'ffmpeg -y -i ./media/3s1m8cw09sl11.gif -movflags faststart -pix_fmt yuv420p -vf "scale=trunc(iw/2)*2:trunc(ih/2)*2" ./media/3s1m8cw09sl11.mp4': 'ffmpeg -y -i ./media/3s1m8cw09sl11.gif -movflags faststart -pix_fmt yuv420p -vf "scale=trunc(iw/2)*2:trunc(ih/2)*2" ./media/3s1m8cw09sl11.mp4'

  So I thought maybe there’s an error with the download, so I change path to a static file on the server, and it still gives me the same error.
  Any tips ?

• 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.