import * as ffmpeg from 'fluent-ffmpeg' import { join } from 'path' import { VideoResolution } from '../../shared/models/videos' import { CONFIG, VIDEO_TRANSCODING_FPS } from '../initializers' import { unlinkPromise } from './core-utils' import { processImage } from './image-utils' import { logger } from './logger' async function getVideoFileResolution (path: string) { const videoStream = await getVideoFileStream(path) return { videoFileResolution: Math.min(videoStream.height, videoStream.width), isPortraitMode: videoStream.height > videoStream.width } } async function getVideoFileFPS (path: string) { const videoStream = await getVideoFileStream(path) for (const key of [ 'r_frame_rate' , 'avg_frame_rate' ]) { const valuesText: string = videoStream[key] if (!valuesText) continue const [ frames, seconds ] = valuesText.split('/') if (!frames || !seconds) continue const result = parseInt(frames, 10) / parseInt(seconds, 10) if (result > 0) return Math.round(result) } return 0 } function getDurationFromVideoFile (path: string) { return new Promise((res, rej) => { ffmpeg.ffprobe(path, (err, metadata) => { if (err) return rej(err) return res(Math.floor(metadata.format.duration)) }) }) } async function generateImageFromVideoFile (fromPath: string, folder: string, imageName: string, size: { width: number, height: number }) { const pendingImageName = 'pending-' + imageName const options = { filename: pendingImageName, count: 1, folder } const pendingImagePath = join(folder, pendingImageName) try { await new Promise((res, rej) => { ffmpeg(fromPath) .on('error', rej) .on('end', () => res(imageName)) .thumbnail(options) }) const destination = join(folder, imageName) await processImage({ path: pendingImagePath }, destination, size) } catch (err) { logger.error('Cannot generate image from video %s.', fromPath, { err }) try { await unlinkPromise(pendingImagePath) } catch (err) { logger.debug('Cannot remove pending image path after generation error.', { err }) } } } type TranscodeOptions = { inputPath: string outputPath: string resolution?: VideoResolution isPortraitMode?: boolean } function transcode (options: TranscodeOptions) { return new Promise(async (res, rej) => { let command = ffmpeg(options.inputPath) .output(options.outputPath) .videoCodec('libx264') .outputOption('-threads ' + CONFIG.TRANSCODING.THREADS) .outputOption('-movflags faststart') .outputOption('-b_strategy 1') // NOTE: b-strategy 1 - heuristic algorythm, 16 is optimal B-frames for it .outputOption('-bf 16') // NOTE: Why 16: https://github.com/Chocobozzz/PeerTube/pull/774. b-strategy 2 -> B-frames<16 // .outputOption('-crf 18') let fps = await getVideoFileFPS(options.inputPath) if (options.resolution !== undefined) { // '?x720' or '720x?' for example const size = options.isPortraitMode === true ? `${options.resolution}x?` : `?x${options.resolution}` command = command.size(size) // On small/medium resolutions, limit FPS if ( options.resolution < VIDEO_TRANSCODING_FPS.KEEP_ORIGIN_FPS_RESOLUTION_MIN && fps > VIDEO_TRANSCODING_FPS.AVERAGE ) { fps = VIDEO_TRANSCODING_FPS.AVERAGE } } if (fps) { // Hard FPS limits if (fps > VIDEO_TRANSCODING_FPS.MAX) fps = VIDEO_TRANSCODING_FPS.MAX else if (fps < VIDEO_TRANSCODING_FPS.MIN) fps = VIDEO_TRANSCODING_FPS.MIN command = command.withFPS(fps) } command .on('error', (err, stdout, stderr) => { logger.error('Error in transcoding job.', { stdout, stderr }) return rej(err) }) .on('end', res) .run() }) } // --------------------------------------------------------------------------- export { getVideoFileResolution, getDurationFromVideoFile, generateImageFromVideoFile, transcode, getVideoFileFPS } // --------------------------------------------------------------------------- function getVideoFileStream (path: string) { return new Promise((res, rej) => { ffmpeg.ffprobe(path, (err, metadata) => { if (err) return rej(err) const videoStream = metadata.streams.find(s => s.codec_type === 'video') if (!videoStream) throw new Error('Cannot find video stream of ' + path) return res(videoStream) }) }) }