300 lines
10 KiB
TypeScript
300 lines
10 KiB
TypeScript
import { existsSync, writeFileSync, readFileSync, unlinkSync } from 'node:fs'
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import { dirname, join } from 'node:path'
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import { spawn } from 'node:child_process'
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function collectError(stderr: string, fallback: string) {
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const text = stderr.replace(/\r/g, '').trim()
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const lines = text.split('\n').map(line => line.trim()).filter(Boolean)
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return lines.slice(-6).join(' ') || fallback
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}
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export function runFfmpeg(args: string[], timeoutMs = 120000) {
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return new Promise<void>((resolve, reject) => {
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const proc = spawn('ffmpeg', args, { stdio: ['ignore', 'ignore', 'pipe'] })
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let stderr = ''
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proc.stderr?.on('data', (chunk: Buffer | string) => { stderr += String(chunk) })
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const timer = setTimeout(() => {
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try { proc.kill('SIGKILL') } catch { /* ignore */ }
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reject(new Error(`FFmpeg timed out after ${Math.round(timeoutMs / 1000)}s`))
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}, timeoutMs)
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proc.on('error', (error) => {
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clearTimeout(timer)
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const message = (error as NodeJS.ErrnoException).code === 'ENOENT'
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? 'FFmpeg is not installed on this server'
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: error.message
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reject(new Error(message))
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})
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proc.on('close', (code) => {
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clearTimeout(timer)
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if (code === 0) resolve()
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else reject(new Error(collectError(stderr, `FFmpeg exited with code ${code}`)))
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})
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})
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}
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function runFfprobe(args: string[], timeoutMs = 15000) {
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return new Promise<string>((resolve, reject) => {
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const proc = spawn('ffprobe', args, { stdio: ['ignore', 'pipe', 'pipe'] })
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let out = ''
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let err = ''
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proc.stdout?.on('data', (chunk: Buffer | string) => { out += String(chunk) })
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proc.stderr?.on('data', (chunk: Buffer | string) => { err += String(chunk) })
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const timer = setTimeout(() => {
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try { proc.kill('SIGKILL') } catch { /* ignore */ }
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reject(new Error('ffprobe timed out'))
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}, timeoutMs)
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proc.on('error', (error) => {
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clearTimeout(timer)
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reject(error)
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})
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proc.on('close', (code) => {
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clearTimeout(timer)
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if (code === 0) resolve(out.trim())
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else reject(new Error(collectError(err, `ffprobe exited with code ${code}`)))
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})
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})
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}
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function concatPath(filePath: string) {
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return filePath.replace(/\\/g, '/').replace(/'/g, "'\\''")
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}
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export async function extractLastFrame(inputPath: string, outputPath: string) {
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if (!existsSync(inputPath)) {
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throw new Error('Source video is missing')
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}
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const attempts: string[][] = []
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try {
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const duration = await probeDuration(inputPath)
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const seek = Math.max(0, duration - 0.08)
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attempts.push(['-y', '-ss', seek.toFixed(3), '-i', inputPath, '-frames:v', '1', '-an', '-q:v', '1', outputPath])
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} catch {
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// Truncated files often have no duration index; fall through to decode attempts.
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}
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attempts.push(
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['-y', '-sseof', '-0.04', '-i', inputPath, '-update', '1', '-frames:v', '1', '-an', '-q:v', '1', outputPath],
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['-y', '-i', inputPath, '-update', '1', '-an', '-q:v', '1', outputPath]
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)
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for (const args of attempts) {
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try {
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await runFfmpeg(args, 60000)
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if (existsSync(outputPath)) return
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} catch {
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// Try the next seek strategy.
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}
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}
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throw new Error('Could not extract the last frame. The video looks incomplete — interrupting Comfy mid-encode usually causes this. Earlier saved parts are still in the library.')
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}
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export async function extractFirstFrame(inputPath: string, outputPath: string) {
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if (!existsSync(inputPath)) {
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throw new Error('Source video is missing')
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}
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await runFfmpeg([
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'-y',
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'-i', inputPath,
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'-frames:v', '1',
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'-update', '1',
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'-an',
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'-q:v', '4',
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outputPath
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], 20000)
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if (!existsSync(outputPath)) {
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throw new Error('Could not extract the first frame')
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}
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}
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export async function probeHasAudio(filePath: string) {
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try {
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const out = await runFfprobe([
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'-v', 'error',
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'-select_streams', 'a:0',
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'-show_entries', 'stream=codec_type',
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'-of', 'csv=p=0',
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filePath
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])
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return out.includes('audio')
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} catch {
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return false
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}
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}
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const XFADE_DURATION = 0.12
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function parseRate(rate: string) {
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const [num, den] = String(rate || '').split('/').map(Number)
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if (den) return num / den
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const value = Number(rate)
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return Number.isFinite(value) && value > 0 ? value : NaN
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}
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export async function probeDuration(filePath: string) {
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const raw = await runFfprobe([
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'-v', 'error',
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'-select_streams', 'v:0',
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'-show_entries', 'stream=duration,nb_frames,r_frame_rate,avg_frame_rate',
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'-show_entries', 'format=duration',
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'-of', 'json',
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filePath
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])
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const parsed = JSON.parse(raw) as {
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format?: { duration?: string }
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streams?: Array<{ duration?: string; nb_frames?: string; r_frame_rate?: string; avg_frame_rate?: string }>
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}
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const stream = parsed.streams?.[0] || {}
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const fps = parseRate(stream.avg_frame_rate || '') || parseRate(stream.r_frame_rate || '')
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const frames = Number(stream.nb_frames)
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const fromFrames = Number.isFinite(frames) && frames > 0 && Number.isFinite(fps) ? frames / fps : NaN
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const candidates = [Number(stream.duration), Number(parsed.format?.duration), fromFrames]
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.filter(value => Number.isFinite(value) && value > 0)
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if (!candidates.length) {
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throw new Error('Could not read video duration')
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}
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return Math.min(...candidates)
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}
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async function probeSize(filePath: string) {
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const out = await runFfprobe([
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'-v', 'error',
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'-select_streams', 'v:0',
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'-show_entries', 'stream=width,height',
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'-of', 'csv=p=0',
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filePath
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])
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const [width, height] = out.split(',').map(Number)
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return {
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width: Number.isFinite(width) && width > 0 ? width : 1344,
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height: Number.isFinite(height) && height > 0 ? height : 768
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}
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}
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function encodeArgs(outputPath: string, withAudio: boolean) {
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const args = [
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'-c:v', 'libx264',
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'-preset', 'fast',
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'-crf', '17',
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'-pix_fmt', 'yuv420p',
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'-movflags', '+faststart'
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]
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if (withAudio) args.push('-c:a', 'aac')
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args.push(outputPath)
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return args
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}
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async function assertStitchLength(part1Path: string, part2Path: string, outputPath: string, fade = 0) {
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const [duration1, duration2, output] = await Promise.all([
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probeDuration(part1Path),
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probeDuration(part2Path),
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probeDuration(outputPath)
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])
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const expected = duration1 + duration2 - fade
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if (output < expected * 0.75 || output < duration1 + 0.75) {
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throw new Error(`Stitched video was ${output.toFixed(2)}s, expected about ${expected.toFixed(2)}s`)
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}
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}
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async function xfadeStitch(part1Path: string, part2Path: string, outputPath: string) {
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const [duration1, duration2, size, audio1, audio2] = await Promise.all([
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probeDuration(part1Path),
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probeDuration(part2Path),
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probeSize(part1Path),
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probeHasAudio(part1Path),
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probeHasAudio(part2Path)
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])
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const fade = Math.min(XFADE_DURATION, Math.max(0.04, duration1 - 0.08), Math.max(0.04, duration2 - 0.08))
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const offset = Math.max(0, Number((duration1 - fade - 0.04).toFixed(3)))
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const prepare1 = `scale=${size.width}:${size.height}:flags=bicubic,format=yuv420p,setpts=PTS-STARTPTS`
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const prepare2 = `select='gte(n,1)',setpts=PTS-STARTPTS,scale=${size.width}:${size.height}:flags=bicubic,format=yuv420p`
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const videoFilter = `[0:v]${prepare1}[v0];[1:v]${prepare2}[v1];[v0][v1]xfade=transition=fade:duration=${fade.toFixed(3)}:offset=${offset},setpts=PTS-STARTPTS[v]`
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const runVideo = async (withAudio: boolean) => {
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const args = [
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'-y',
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'-i', part1Path,
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'-i', part2Path,
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'-filter_complex', withAudio
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? `${videoFilter};[0:a]asetpts=PTS-STARTPTS[a0];[1:a]asetpts=PTS-STARTPTS[a1];[a0][a1]acrossfade=d=${fade.toFixed(3)}:c1=tri:c2=tri[a]`
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: videoFilter,
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'-map', '[v]',
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...(withAudio ? ['-map', '[a]'] : []),
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...encodeArgs(outputPath, withAudio)
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]
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await runFfmpeg(args, 300000)
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}
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if (audio1 && audio2) {
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try {
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await runVideo(true)
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} catch {
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await runVideo(false)
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}
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} else {
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await runVideo(false)
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}
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if (!existsSync(outputPath)) {
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throw new Error('FFmpeg did not write the blended video')
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}
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await assertStitchLength(part1Path, part2Path, outputPath, fade)
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}
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async function concatReencode(part1Path: string, part2Path: string, outputPath: string) {
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const audio1 = await probeHasAudio(part1Path)
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const audio2 = await probeHasAudio(part2Path)
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if (audio1 && audio2) {
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await runFfmpeg([
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'-y',
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'-i', part1Path,
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'-i', part2Path,
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'-filter_complex', '[0:v]setpts=PTS-STARTPTS[v0];[1:v]select=\'gte(n,1)\',setpts=PTS-STARTPTS[v1];[0:a]asetpts=PTS-STARTPTS[a0];[1:a]asetpts=PTS-STARTPTS[a1];[v0][a0][v1][a1]concat=n=2:v=1:a=1[v][a]',
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'-map', '[v]',
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'-map', '[a]',
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...encodeArgs(outputPath, true)
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], 300000)
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} else {
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await runFfmpeg([
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'-y',
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'-i', part1Path,
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'-i', part2Path,
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'-filter_complex', '[0:v]setpts=PTS-STARTPTS[v0];[1:v]select=\'gte(n,1)\',setpts=PTS-STARTPTS[v1];[v0][v1]concat=n=2:v=1:a=0[v]',
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'-map', '[v]',
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...encodeArgs(outputPath, false)
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], 300000)
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}
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if (!existsSync(outputPath)) {
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throw new Error('FFmpeg did not write the stitched video')
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}
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await assertStitchLength(part1Path, part2Path, outputPath)
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}
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export async function concatMp4(part1Path: string, part2Path: string, outputPath: string) {
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const listPath = join(dirname(outputPath), 'concat_list.txt')
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writeFileSync(listPath, `file '${concatPath(part1Path)}'\nfile '${concatPath(part2Path)}'\n`)
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try {
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await runFfmpeg(['-y', '-f', 'concat', '-safe', '0', '-i', listPath, '-c', 'copy', outputPath], 180000)
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await assertStitchLength(part1Path, part2Path, outputPath)
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} catch {
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await concatReencode(part1Path, part2Path, outputPath)
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}
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}
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export async function stitchExtension(params: { part1Path: string; part2: Buffer; tmpDir: string }) {
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const part2Path = join(params.tmpDir, `part2_${Date.now()}.mp4`)
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const finalPath = join(params.tmpDir, 'final_stitched_video.mp4')
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writeFileSync(part2Path, params.part2)
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if (!existsSync(part2Path) || !params.part2.length) {
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throw new Error('Extension segment was missing before stitch')
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}
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try {
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await xfadeStitch(params.part1Path, part2Path, finalPath)
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} catch (error) {
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console.error('[stitch] xfade failed, concatenating:', (error as Error).message)
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await concatReencode(params.part1Path, part2Path, finalPath)
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}
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const stitched = readFileSync(finalPath)
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for (const extra of [part2Path, join(params.tmpDir, 'concat_list.txt'), join(params.tmpDir, 'last_frame.png')]) {
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try { unlinkSync(extra) } catch { /* ignore */ }
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}
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return stitched
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}
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