138 lines
4 KiB
TypeScript
138 lines
4 KiB
TypeScript
import * as ffmpeg from 'fluent-ffmpeg'
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import { join } from 'path'
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import { VideoResolution } from '../../shared/models/videos'
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import { CONFIG, VIDEO_TRANSCODING_FPS } from '../initializers'
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import { unlinkPromise } from './core-utils'
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import { processImage } from './image-utils'
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import { logger } from './logger'
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async function getVideoFileResolution (path: string) {
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const videoStream = await getVideoFileStream(path)
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return {
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videoFileResolution: Math.min(videoStream.height, videoStream.width),
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isPortraitMode: videoStream.height > videoStream.width
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}
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}
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async function getVideoFileFPS (path: string) {
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const videoStream = await getVideoFileStream(path)
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for (const key of [ 'r_frame_rate' , 'avg_frame_rate' ]) {
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const valuesText: string = videoStream[key]
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if (!valuesText) continue
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const [ frames, seconds ] = valuesText.split('/')
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if (!frames || !seconds) continue
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const result = parseInt(frames, 10) / parseInt(seconds, 10)
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if (result > 0) return result
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}
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return 0
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}
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function getDurationFromVideoFile (path: string) {
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return new Promise<number>((res, rej) => {
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ffmpeg.ffprobe(path, (err, metadata) => {
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if (err) return rej(err)
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return res(Math.floor(metadata.format.duration))
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})
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})
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}
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async function generateImageFromVideoFile (fromPath: string, folder: string, imageName: string, size: { width: number, height: number }) {
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const pendingImageName = 'pending-' + imageName
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const options = {
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filename: pendingImageName,
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count: 1,
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folder
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}
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const pendingImagePath = join(folder, pendingImageName)
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try {
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await new Promise<string>((res, rej) => {
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ffmpeg(fromPath)
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.on('error', rej)
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.on('end', () => res(imageName))
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.thumbnail(options)
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})
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const destination = join(folder, imageName)
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await processImage({ path: pendingImagePath }, destination, size)
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} catch (err) {
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logger.error('Cannot generate image from video %s.', fromPath, err)
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try {
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await unlinkPromise(pendingImagePath)
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} catch (err) {
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logger.debug('Cannot remove pending image path after generation error.', err)
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}
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}
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}
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type TranscodeOptions = {
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inputPath: string
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outputPath: string
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resolution?: VideoResolution
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isPortraitMode?: boolean
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}
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function transcode (options: TranscodeOptions) {
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return new Promise<void>(async (res, rej) => {
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const fps = await getVideoFileFPS(options.inputPath)
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let command = ffmpeg(options.inputPath)
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.output(options.outputPath)
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.videoCodec('libx264')
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.outputOption('-threads ' + CONFIG.TRANSCODING.THREADS)
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.outputOption('-movflags faststart')
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// .outputOption('-crf 18')
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// Our player has some FPS limits
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if (fps > VIDEO_TRANSCODING_FPS.MAX) command = command.withFPS(VIDEO_TRANSCODING_FPS.MAX)
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else if (fps < VIDEO_TRANSCODING_FPS.MIN) command = command.withFPS(VIDEO_TRANSCODING_FPS.MIN)
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if (options.resolution !== undefined) {
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// '?x720' or '720x?' for example
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const size = options.isPortraitMode === true ? `${options.resolution}x?` : `?x${options.resolution}`
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command = command.size(size)
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}
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command
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.on('error', (err, stdout, stderr) => {
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logger.error('Error in transcoding job.', { stdout, stderr })
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return rej(err)
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})
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.on('end', res)
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.run()
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})
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}
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// ---------------------------------------------------------------------------
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export {
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getVideoFileResolution,
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getDurationFromVideoFile,
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generateImageFromVideoFile,
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transcode,
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getVideoFileFPS
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}
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// ---------------------------------------------------------------------------
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function getVideoFileStream (path: string) {
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return new Promise<any>((res, rej) => {
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ffmpeg.ffprobe(path, (err, metadata) => {
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if (err) return rej(err)
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const videoStream = metadata.streams.find(s => s.codec_type === 'video')
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if (!videoStream) throw new Error('Cannot find video stream of ' + path)
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return res(videoStream)
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})
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})
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}
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