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Install FFMPEG on OS X with HomeBrew to convert Mp4 to WebM
brew install ffmpeg --with-chromaprint --with-fdk-aac --with-libass --with-librsvg --with-libsoxr --with-libssh --with-tesseract --with-libvidstab --with-opencore-amr --with-openh264 --with-openjpeg --with-openssl --with-rtmpdump --with-rubberband --with-sdl2 --with-snappy --with-tools --with-webp --with-x265 --with-xz --with-zeromq --with-zimg
install  homebrew  ffmpeg 
18 days ago by konfluenzpunkt
Converting a JPEG to the new HEIF image format
Note: This tutorial assumes you have macOS, Homebrew, Git, cmake, and about 5 minutes to spare. Just want a HEIF image? Download a sample.
Step 1: Install x265
brew install x265
Step 2: Download FFMPEG and build it with the --enable-x265 extension
brew uninstall ffmpeg
brew install ffmpeg --with-x265
Step 3: Download and build the HEIF Sample Implementation
git clone https://github.com/nokiatech/heif.git
cd heif
cmake .
make install
Step 4: Use FFMPEG to convert a JPEG to a HVEC bytestream
IMPORTANT: You must use an image with even width and height values (eg: 2042 not 2041) at the moment. The reference implementation will not display images with odd sizes.

`crf` is the quality level. Lower is higher quality.
`pix_fmt` must be yuv420p - the sample HEIF implementation doesn't seem to like other pixel formats, though the format officially supports them.
ffmpeg -i ./your-image.jpg -crf 12 -preset slower -pix_fmt yuv420p \
-f hevc bitstream.265

ffmpeg -i ./your-image.jpg -vf scale=320:240 -crf 28 -preset slower \
-pix_fmt yuv420p -f hevc bitstream.thumb.265
ffmpeg  HVEC  jpeg 
22 days ago by euler
CompilationGuide/macOS – FFmpeg
brew install automake fdk-aac git lame libass libtool libvorbis libvpx \
opus sdl shtool texi2html theora wget x264 x265 xvid nasm
ffmpeg  aac  mp3  iphone  ringtones  howto  brew  osX 
26 days ago by josephishak

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