A cli script to create .webm clips using mpv, svt-av1 and ffmpeg
I just wrote this while playing around with, and testing, SVT-AV1. There are probably better scripts out there, but it does its job.. kinda.
It will probably not work for some input videos, eg. variable framerate .mkv
SvtAv1EncApp, mpv, ffmpeg, and ffprobe in your PATH (or edit the script).
mpv is used to create a temporary clip with burned subtitles. It's significantly faster for burning subtitles than ffmpegs subtitle filter. Ffmpegs subtitle filter demuxes the entire subtitle track in the beginning, which takes a while for large videos.
pip install av1clip
Clip from 01:20.69 to 01:30.96
av1clip -s 01:20.69 -e 01:30.96 coolvideo.mkv
Clip first 10 seconds and scale video to 480p
av1clip -e 10.0 -sh 480 coolvideo.mkv
$ av1clip -h
usage: av1clip [-h] [-s START] [-e END] [-vid VID] [-aid AID] [-sid SID] [-sw WIDTH] [-sh HEIGHT] [-ab AUDIO_BITRATE] [-crf CRF] [--preset PRESET] [--tile-rows TILE_ROWS] [--tile-columns TILE_COLUMNS] [-g FILM_GRAIN] [--scd SCD] input_file
positional arguments:
input_file input video file
optional arguments:
-h, --help show this help message and exit
-s START, --start START
start time
-e END, --end END end time
track selection:
set to 'no' to disable, default 'auto'
-vid VID video track id
-aid AID audio track id
-sid SID subtitle track id
filters:
-sw WIDTH, --width WIDTH
scale to specified width
-sh HEIGHT, --height HEIGHT
scale to specified height
encode settings:
-ab AUDIO_BITRATE, --audio-bitrate AUDIO_BITRATE
Opus audio bitrate [500-512k], default 192k
-crf CRF, --crf CRF SVT-AV1 crf [0-63], default 30
--preset PRESET SVT-AV1 preset [0-8], default 3
--tile-rows TILE_ROWS
SVT-AV1 log2 of tile rows [0-6], default 2
--tile-columns TILE_COLUMNS
SVT-AV1 log2 of tile columns [0-4], default 2
-g FILM_GRAIN, --film-grain FILM_GRAIN
SVT-AV1 film-grain synthesis [0-50], default 8
--scd SCD SVT-AV1 enable scene change detection [0-1], default: 0