djkato/Discord-Media-Compressor-sub-8mb
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added max audio bitrate limit

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Djkato 2022-06-09 14:30:08 +02:00
parent 8daf8d07d7
commit c8c32d8126
1 changed files with 12 additions and 3 deletions
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15
lib/encoder.js
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@ -51,10 +51,17 @@ class Encoder {
async #constructVideoCommand(path, out) { async #constructVideoCommand(path, out) {
let [duration, resolutionHeight] = await this.#getDurationAndResolution(path) let [duration, resolutionHeight] = await this.#getDurationAndResolution(path)
//Calculates video bitrate to fit right under 8mb 2:6 audio:video. 8Mb * 8 = 64000 - 1000 for overhead, *0.97 to leave space for container. //Calculates video bitrate to fit right under 8mb 1:7 audio:video. 8Mb * 8 = 64000(8mb) - 1000 for overhead, *0.97 to leave space for container.
const audioBitRate = Math.round((63000 / 8 * 2 / duration) * 0.97) const maxOpusBitrate = 256 //kbits
const videoBitRate = Math.round((63000 / 8 * 6 / duration) * 0.97)
let audioBitRate = Math.round((62000 / 8 * 1 / duration) * 0.97)
let videoBitRate = Math.round((62000 / 8 * 7 / duration) * 0.97)
//if maxOpusBitrate reached, cap the audio bit rate and give the rest of the bits to video
if (audioBitRate > maxOpusBitrate) {
videoBitRate += audioBitRate - maxOpusBitrate
audioBitRate = maxOpusBitrate
}
//if command had argument of anotehr quality setting change to use that setting //if command had argument of anotehr quality setting change to use that setting
if (this.encodePresetIndexArg) { if (this.encodePresetIndexArg) {
this.currentSetting = this.settings.presets[this.encodePresetIndexArg] this.currentSetting = this.settings.presets[this.encodePresetIndexArg]
@ -89,6 +96,7 @@ class Encoder {
command += `-qmax 60 ` command += `-qmax 60 `
command += `-g 240 ` command += `-g 240 `
command += `-row-mt 1 "${out}.webm" ` command += `-row-mt 1 "${out}.webm" `
console.log(command)
return [command, duration, false] return [command, duration, false]
} }
@ -124,6 +132,7 @@ class Encoder {
command += `-g 240 ` command += `-g 240 `
command += `-row-mt 1 -pass 2 "${out}.webm" ` command += `-row-mt 1 -pass 2 "${out}.webm" `
console.log(command)
return [command, duration, isTwoPass] return [command, duration, isTwoPass]
} }