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better mov encoding instruction

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minjaesong
2023-07-24 02:13:06 +09:00
parent cb68f7cad7
commit 4b2aa25726
1 changed files with 9 additions and 8 deletions
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17
assets/disk0/tvdos/bin/encodemov.js
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@@ -2,16 +2,17 @@
//
let IPFMODE = 2 // 1 or 2
let TOTAL_FRAMES = 3813
let FPS = 30
let FPS = 30 // must be integer
let WIDTH = 560
let HEIGHT = 448
let PATHFUN = (i) => `/ddol2/${(''+i).padStart(5,'0')}.bmp` // how can be the image file found, if a frame number (starts from 1) were given
let PATHFUN = (i) => `/ddol2/${(''+i).padStart(5,'0')}.png` // how can be the image file found, if a frame number (starts from 1) were given
let AUDIOTRACK = 'ddol.mp2'
let AUDIOFORMAT = 'MP2fr' // PCMu8 or MP2fr
// to export video to its frames:
// ffmpeg -i file.mp4 file/%05d.png
// the input frames must be resized (and cropped) beforehand, using ImageMagick is recommended, like so:
// mogrify -path ./path/to/write/results/ -resize 560x448^ -gravity Center -extent 560x448 ./path/to/source/files/*
let AUDIOFORMAT = 'MP2fr' // undefined or PCMu8 or MP2fr
// to export video to its frames (with automatic scaling and cropping):
// ffmpeg -i file.mp4 -vf scale=560:448:force_original_aspect_ratio=increase,crop=560:448 file/%05d.png
//
// to convert audio to MP2:
// ffmpeg -i file.mp4 -acodec libtwolame -psymodel 4 -b:a <rate>k -ar 32000 output.mp2
//
// end of manual configuration
let MP2_RATE_INDEX;
@@ -144,7 +145,7 @@ for (let f = 1; ; f++) {
audioFile.pread(infile, actualBytesToRead, audioBytesRead)
if (f > 1) audioSamplesWrote += 2304 / DECODE_TIME_FACTOR // a little hack to ensure first 2 or so frames get more MP2 frames than they should
}
else throw Error("Unknown audio format: " + AUDIOFORMAT)
else if (AUDIOFORMAT !== undefined) throw Error("Unknown audio format: " + AUDIOFORMAT)
// writeout
let audioSize = [