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• How to recompile ffmpeg in Ubuntu

  26 avril 2017, par David Page

  I installed ffmpeg in Ubuntu but in a wrong way—I compiled it with only —enable-libass. And now I can not use -crf option so I want to recompile it.

  According to this page I typed these command :

  rm -rf ~/ffmpeg_build ~/ffmpeg_sources~/bin/{ffmpeg,ffprobe,ffplay,ffserver,vsyasm,x264,x265,yasm,ytasm}

  then I started compile again :

  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-gpl \
  
    --enable-libass \
  
    --enable-libfdk-aac \
  
    --enable-libfreetype \
  
    --enable-libmp3lame \
  
    --enable-libopus \
  
    --enable-libtheora \
  
    --enable-libvorbis \
  
    --enable-libvpx \
  
    --enable-libx264 \
  
    --enable-libx265 \
  
    --enable-nonfree
  
  PATH="$HOME/bin:$PATH" make
  
  make install
  
  make distclean
  
  hash -r

  But when I type ffmpeg it still output :

  ffmpeg version N-77474-g11388b5 Copyright (c) 2000-2015 the FFmpeg developers
  
    built with gcc 4.8 (Ubuntu 4.8.4-2ubuntu1~14.04)
  
    configuration: --enable-libass
  
    libavutil      55. 11.100 / 55. 11.100
  
    libavcodec     57. 20.100 / 57. 20.100
  
    libavformat    57. 20.100 / 57. 20.100
  
    libavdevice    57.  0.100 / 57.  0.100
  
    libavfilter     6. 22.100 /  6. 22.100
  
    libswscale      4.  0.100 /  4.  0.100
  
    libswresample   2.  0.101 /  2.  0.101

  I am puzzled and how to recompile or remove ffmpeg in a right way ?

• Convert TIFF images sequence to lossless movie FFMPEG

  9 janvier 2016, par Rarez

  I would like use a h265 codec(FPS must be equal to 25) to save loseless wideo from sequence of TIFF images. I have a problem with save it. I supose that it is little mistake. I tried many combinactions of commands here is last one :

  ffmpeg -f image2 -r $FRAMERATE -i IMG_%03d.tif -vcodec libx265 -x265-params lossless movie.mp4

  And output :

  [libx265 @ 0x2bcaf40] 4:2:2 and 4:4:4 support is not fully defined for HEVC yet. Set -strict experimental to encode anyway.
  
  Output #0, mp4, to 'movie.mp4':
  
      Stream #0:0: Video: hevc, none, q=2-31, 128 kb/s, SAR 1:1 DAR 0:0, 25 fps
  
      Metadata:
  
        encoder         : Lavc57.20.100 libx265
  
  Stream mapping:
  
    Stream #0:0 -> #0:0 (tiff (native) -> hevc (libx265))
  
  Error while opening encoder for output stream #0:0 - maybe incorrect parameters such as bit_rate, rate, width or height

  I will be very glad for any help. Thanks

• Ffmpeg - Scale down video with overlay

  30 juillet 2020, par pillarman38

  I am trying to transcode a video with a subtitle overlay but I need to scale it down from 4k to 1080. How would I go about doing that with a complex filter ?

  


  ffmpeg -ss 00:00:00 -i myVideo.mkv -filter_complex[0:v][0:s:0]overlay[v] -map [v] -map 0:a:0 -y -acodec aac -ac 6 -pix_fmt yuv420p10le -vcodec libx265 -x265-params colorprim=bt2020:transfer=smpte2084:colormatrix=bt2020nc -start_number 0 -hls_time 5 -force_key_frames expr:gte(t,n_forced*5) -hls_list_size 0 -f hls `output.ts`