On mac:
- Download the latest release.
- Extract the binary and place it in
/usr/local/bin
.
Most basic conversion using Terminal: ffmpeg -i input.mov output.webm
.
Flag: -an
.
Example flag: -vf scale=1280:-2
.
-1
for the width or height will keep it in ratio to the other specified dimension.
-2
will keep it in ratio to the other specified dimension, but, to ensure it is divisible by 2 (a requirement for certain encodings such as yuv420p
) the width or height will be adjusted if necessary.
Docs here.
Flag: -threads 0
.
Allow your CPU to use an optimal number of threads.
Guide here.
ffmpeg -i input.mov -c:v libvpx -qmin 0 -qmax 25 -crf 4 -b:v 1M -vf scale=1280:-2 -c:a libvorbis -threads 0 output.webm
ffmpeg -i input.mov -c:v libvpx -qmin 0 -qmax 25 -crf 4 -b:v 1M -vf scale=1280:-2 -an -threads 0 output.webm
Guide here.
Flag: -pix_fmt yuv420p
.
Note: Requires dimensions to be divisible by 2.
Flag: -profile:v baseline -level 3.0
.
Android in particular doesn't support higher profiles.
Example flag: -crf 20
.
0
is lossless, 23
is default, and 51
is worst possible. 18
-28
is a sane range.
Flag: -movflags +faststart
.
Moves some data to the beginning of the file, allowing the video to be played before it is completely downloaded.
ffmpeg -i input.mov -c:v libx264 -pix_fmt yuv420p -profile:v baseline -level 3.0 -crf 22 -preset veryslow -vf scale=1280:-2 -c:a aac -strict experimental -movflags +faststart -threads 0 output.mp4
ffmpeg -i input.mov -c:v libx264 -pix_fmt yuv420p -profile:v baseline -level 3.0 -crf 22 -preset veryslow -vf scale=1280:-2 -an -movflags +faststart -threads 0 output.mp4
- In a folder, make sure your master videos are named how you want your exports to be named.
- Save the bash script below as
video4web.sh
in the folder. - In Terminal,
cd
to the folder. - Run
chmod +x video4web.sh
. - Run the script using the parameters documented. E.g.
./video4web.sh mov 1280
.
#!/bin/bash
# Generates a cover image along with mute web-ready WebM and MP4 files for each master video in a folder.
# See: https://gist.github.com/jaydenseric/220c785d6289bcfd7366.
# Parameter 1: Input video format (e.g. "mov").
# Parameter 2: Output width in pixels (e.g. "1280").
# Example use: "./video4web.sh mov 1280".
for i in *.$1
do
# Generate cover image
ffmpeg -i $i -vframes 1 -vf scale=$2:-2 -q:v 1 ${i%$1}jpg
# Generate WebM
ffmpeg -i $i -c:v libvpx -qmin 0 -qmax 25 -crf 4 -b:v 1M -vf scale=$2:-2 -an -threads 0 ${i%$1}webm
# Generate MP4
ffmpeg -i $i -c:v libx264 -pix_fmt yuv420p -profile:v baseline -level 3.0 -crf 22 -preset veryslow -vf scale=$2:-2 -an -movflags +faststart -threads 0 ${i%$1}mp4
done
Also, replace the$2 with $ {2:-1280} to default to 1280, allowing just the extension to be passed. You can also replace $1 with $ {1:-mp4} to just run the script with no parameters to default to "mp4" and 1280.