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Brooke Vibber 2024-03-04 12:04:19 -08:00
parent 4d2a4059da
commit 7b47c441fb
2 changed files with 329 additions and 0 deletions
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31
prep-set Executable file
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#!/bin/bash
set -e
OPTS=""
for INFILE in "$@"
do
if [[ "$1" =~ ^--.* ]]
then
echo "OPTION: $1"
OPTS="$OPTS $1"
shift
else
echo "FILE: $INFILE"
MAPPED="prep-set-${INFILE%.mp4}.2160p.sdr.h264.mp4"
prep-vid $OPTS "$INFILE" "$MAPPED"
prep-vid $OPTS "$MAPPED" "${INFILE%.mp4}.360p.sdr.thumb.jpg"
prep-vid $OPTS "$INFILE" "${INFILE%.mp4}.360p.hdr.thumb.avif"
prep-vid $OPTS "$MAPPED" "${INFILE%.mp4}.720p.sdr.h264.mp4"
prep-vid $OPTS "$INFILE" "${INFILE%.mp4}.720p.hdr.hevc.mp4"
prep-vid $OPTS "$MAPPED" "${INFILE%.mp4}.1080p.sdr.av1.webm"
prep-vid $OPTS "$INFILE" "${INFILE%.mp4}.1080p.hdr.av1.webm"
prep-vid $OPTS "$MAPPED" "${INFILE%.mp4}.2160p.sdr.av1.webm"
prep-vid $OPTS "$INFILE" "${INFILE%.mp4}.2160p.hdr.av1.webm"
fi
done

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prep-vid Executable file
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#!/usr/bin/env php
<?php
// Squishes given video input into sub-4000kb .mp4
// Crops or pads to 16:9 (letterbox default; --crop to crop)
// Includes stereo audio (to strip, pass --no-audio)
// HDR to SDR tonemapping
// Picks bitrate to match
// Picks resolution based on bitrate target
// 2-pass encoding with libx264 veryslow
// fps limiter: warning requires newer ffmpeg than debian-buster
$args = $_SERVER['argv'];
$self = array_shift( $args );
$profiles = [
'360p.sdr.thumb.jpg' => [
'width' => 640,
'height' => 360,
'codec' => 'mjpeg',
'bitrate' => '4000k',
'still' => true,
],
'360p.hdr.thumb.avif' => [
'width' => 640,
'height' => 360,
'codec' => 'libsvtav1',
'bitrate' => '2000k',
'hdr' => true,
'still' => true,
],
'2160p.hdr.av1.webm' => [
'width' => 3840,
'height' => 2160,
'codec' => 'libsvtav1',
'bitrate' => '25000k',
'hdr' => true,
],
'2160p.sdr.av1.webm' => [
'width' => 3840,
'height' => 2160,
'codec' => 'libsvtav1',
'bitrate' => '20000k',
],
'2160p.sdr.h264.mp4' => [
'width' => 3840,
'height' => 2160,
'codec' => 'libx264',
'bitrate' => '50000k',
],
'1080p.hdr.av1.webm' => [
'width' => 1920,
'height' => 1080,
'codec' => 'libsvtav1',
'bitrate' => '6000k',
'hdr' => true,
],
'1080p.sdr.av1.webm' => [
'width' => 1920,
'height' => 1080,
'codec' => 'libsvtav1',
'bitrate' => '4800k',
],
'720p.hdr.hevc.mp4' => [
'width' => 1280,
'height' => 720,
'codec' => 'libx265',
'bitrate' => '4800k',
'hdr' => true,
],
'720p.sdr.h264.mp4' => [
'width' => 1280,
'height' => 720,
'codec' => 'libx264',
'bitrate' => '4800k',
],
];
$options = [
'no-audio' => false,
'exposure' => '0', // stops
'peak' => '1000', // '10000' is max
'preset' => 'medium',
'vibrance' => 0,
];
while ( count( $args ) > 0 && substr( $args[0], 0, 2 ) == '--' ) {
$option = substr( array_shift( $args ), 2 );
$parts = explode( '=', $option, 2 );
if ( count( $parts ) == 2 ) {
[ $key, $val ] = $parts;
$options[$key] = $val;
} else {
$options[$option] = true;
}
}
if ( count ( $args ) < 2 ) {
die(
"Usage: $self [options...] <srcfile.mp4> <destfile.mp4>\n" .
"Options:\n" .
" --no-audio strip audio\n" .
" --exposure=n adjust exposure\n" .
" --peak=n set HDR peak nits\n"
);
}
[ $src, $dest ] = $args;
convert( $src, $dest, $options );
exit(0);
//
function run( $cmd, $args ) {
$commandLine = implode( ' ',
array_merge(
[ escapeshellcmd( $cmd ) ],
array_map( 'escapeshellarg', $args )
)
);
echo "$commandLine\n";
$output = shell_exec( $commandLine );
if ( $output === false ) {
throw new Error( "Failed to run $cmd" );
}
return $output;
}
function ffprobe( $path ) {
$output = run( 'ffprobe', [
'-hide_banner',
'-show_format',
'-show_streams',
'-print_format',
'json',
'--',
$path
] );
$data = json_decode( $output );
if ( $data === null ) {
throw new Error( "Failed to read JSON from ffprobe: $output" );
}
return $data;
}
function sizify( $str ) {
$matches = [];
if ( preg_match( '/^(\d+(?:\.\d+)?)([kmgt]?)$/i', $str, $matches ) ) {
[ , $digits, $suffix ] = $matches;
$n = floatval( $digits );
switch ( strtolower( $suffix ) ) {
case 't': $n *= 1000; // fall through
case 'g': $n *= 1000; // fall through
case 'm': $n *= 1000; // fall through
case 'k': $n *= 1000; // fall through
default: return $n;
}
return $n;
}
die( "Unexpected size format '$str'\n" );
}
function extractTracks( $streams, $type ) {
return array_values(
array_filter( $streams, function ( $stream ) use ( $type ) {
return $stream->codec_type === $type;
} )
);
}
function convert( $src, $dest, $options ) {
global $profiles;
$probe = ffprobe( $src );
$videoTracks = extractTracks( $probe->streams, 'video' );
$audioTracks = extractTracks( $probe->streams, 'audio' );
if ( count( $videoTracks ) == 0 ) {
var_dump( $probe );
die("oh no\n");
}
$track = $videoTracks[0];
$duration = floatval( $probe->format->duration );
$width = $track->width;
$height = $track->height;
// @fixme some files are missing this? trims from qt?
//$hdr = $track->color_primaries === 'bt2020' || $options['hdr'];
// pix_fmt: "yuv420p10le"
$hdr = substr( $track->pix_fmt, -5 ) === 'p10le' || $options['hdr'];
$keyframeInt = intval( ceil( $duration * 60 ) );
if (!preg_match( '/(\d+p)\.(.*?)$/', $dest, $matches ) ) {
die('nooo');
}
$profile = $matches[1] . '.' . $matches[2];
$codec = $profiles[$profile]['codec'];
$bitrate = $profiles[$profile]['bitrate'];
$scaleWidth = $profiles[$profile]['width'];
$scaleHeight = $profiles[$profile]['height'];
$tonemap = $hdr && !( $profiles[$profile]['hdr'] ?? false );
$still = $profiles[$profile]['still'] ?? false;
if ( $still || $options[ 'no-audio' ] || count( $audioTracks ) == 0 ) {
$audio = [ '-an' ];
} else {
$audio = [];
}
if (!$codec ) {
die('no');
}
$exposure = floatval( $options['exposure'] );
$peakNits = floatval( $options['peak'] );
$sdrNits = 80;
$peak = $peakNits / $sdrNits;
$vibrance = floatval( $options['vibrance'] );
$filters = [];
$filters[] = "scale=w=$scaleWidth:h=$scaleHeight";
if ( $tonemap) {
$filters[] = "zscale=t=linear";
if ( $exposure ) {
$filters[] = "exposure=$exposure";
}
$filters[] = "tonemap=hable:peak=$peak:desat=0.0";
$filters[] = "zscale=tin=linear:t=709:p=709:m=709:r=full:dither=ordered";
if ( $vibrance ) {
$filters[] = "vibrance=$vibrance";
}
$filters[] = "format=yuv420p";
}
$vf = implode( ',', $filters );
if ( $still ) {
run( 'ffmpeg', [
'-i', $src,
'-vf', $vf,
'-c:v', $codec,
'-b:v', $bitrate,
'-update', 1,
'-frames:v', 1,
'-an',
'-y', $dest
] );
} else {
$tempPrefix = 'pack-vid-passlog' . rand(0,1 << 31);
$passlog = tempnam( '.', $tempPrefix );
run( 'ffmpeg',
array_merge( [
'-i', $src,
'-f', 'null',
'-vf', $vf,
'-c:v', $codec,
'-b:v', $bitrate,
'-pass', '1',
'-passlogfile', $passlog,
'-g', $keyframeInt,
], $audio, [
'-y', '/dev/null'
] )
);
run( 'ffmpeg',
array_merge( [
'-i', $src,
'-vf', $vf,
'-c:v', $codec,
'-b:v', $bitrate,
'-pass', '2',
'-passlogfile', $passlog,
'-g', $keyframeInt,
], $audio, [
'-movflags', '+faststart',
'-y', $dest
] )
);
$len = strlen( $tempPrefix );
if ( $len > 0 ) {
$dir = dir( './' );
for ( $entry = $dir->read(); $entry !== false; $entry = $dir->read() ) {
if ( substr( $entry, 0, $len ) === $tempPrefix ) {
print "...deleting temp file: $entry\n";
unlink( $entry );
}
}
$dir->close();
}
}
}