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• How to use FFmpeg.wasm ? in nodejs

  29 novembre 2023, par James

  How to use FFmpeg.wasm to add audio to a video in Nodejs. Like adding some background audio to a video in Nodejs ? Can anyone here please help me with this ? https://github.com/FFmpeg-wasm/FFmpeg.wasm

  


  Reel3.mp4 is a video and wolf-howl-6310.mp3 is the audio that i want to merge.
What i tried ?

  


  import { readFile, writeFile } from "fs/promises";
import { FFmpeg } from "@ffmpeg.wasm/main";
import path from "path"; 

const currentDirectory = process.cwd();

const inputFilePath = path.join(currentDirectory, "Reel3.mp4"); 
const outputFilePath = path.join(currentDirectory, "Reel3.mp4"); 

const ffmpeg = await FFmpeg.create({ core: "@ffmpeg.wasm/core-mt" });

try {
  await ffmpeg.fs.writeFile("Reel3", await readFile(inputFilePath));
  await ffmpeg.run("-i", "wolf-howl-6310", "wolf-howl-6310.mp3");
  await writeFile(outputFilePath, ffmpeg.fs.readFile("Reel3.mp4"));
  console.log("Conversion successful!");
} catch (error) {
  console.error("Error:", error);
} finally {
  process.exit(0);
}


  


• Python asyncio subprocess code returns "pipe closed by peer or os.write(pipe, data) raised exception."

  4 novembre 2022, par Duke Dougal

  I am trying to convert a synchronous Python process to asyncio. Any ideas what I am doing wrong ?

  


  This is the synchronous code which successfully starts ffmpeg and converts a directory of webp files into a video.

  


  import subprocess
import shlex
from os import listdir
from os.path import isfile, join

output_filename = 'output.mp4'
process = subprocess.Popen(shlex.split(f'ffmpeg -y -framerate 60 -i pipe: -vcodec libx265 -pix_fmt yuv420p -crf 24 output.mp4'), stdin=subprocess.PIPE)

thepath = '/home/ubuntu/webpfiles/'
thefiles = [f for f in listdir(thepath) if isfile(join(thepath, f))]
for filename in thefiles:
    absolute_path = f'{thepath}{filename}'
    with open(absolute_path, 'rb') as f:
        process.stdin.write(f.read())

process.stdin.close()
process.wait()
process.terminate()


  


  This async code fails :

  


  from os import listdir
from os.path import isfile, join
import shlex
import asyncio

outputfilename = 'output.mp4'

async def write_stdin(proc):
    thepath = '/home/ubuntu/webpfiles/'
    thefiles = [f for f in listdir(thepath) if isfile(join(thepath, f))]
    thefiles.sort()
    for filename in thefiles:
        absolute_path = f'{thepath}{filename}'
        with open(absolute_path, 'rb') as f:
            await proc.communicate(input=f.read())

async def create_ffmpeg_subprocess():
    bin = f'/home/ubuntu/bin/ffmpeg'
    params = f'-y -framerate 60 -i pipe: -vcodec libx265 -pix_fmt yuv420p -crf 24 {outputfilename}'
    proc = await asyncio.create_subprocess_exec(
        bin,
        *shlex.split(params),
        stdin=asyncio.subprocess.PIPE,
        stdout=asyncio.subprocess.PIPE,
        stderr=asyncio.subprocess.PIPE,
    )
    return proc

async def start():
    loop = asyncio.get_event_loop()
    proc = await create_ffmpeg_subprocess()
    task_stdout = loop.create_task(write_stdin(proc))
    await asyncio.gather(task_stdout)

if __name__ == '__main__':
    asyncio.run(start())


  


  The output for the async code is :

  


  pipe closed by peer or os.write(pipe, data) raised exception.
pipe closed by peer or os.write(pipe, data) raised exception.
pipe closed by peer or os.write(pipe, data) raised exception.
pipe closed by peer or os.write(pipe, data) raised exception.
pipe closed by peer or os.write(pipe, data) raised exception.
pipe closed by peer or os.write(pipe, data) raised exception.
pipe closed by peer or os.write(pipe, data) raised exception.
pipe closed by peer or os.write(pipe, data) raised exception.
pipe closed by peer or os.write(pipe, data) raised exception.
pipe closed by peer or os.write(pipe, data) raised exception.
pipe closed by peer or os.write(pipe, data) raised exception.
pipe closed by peer or os.write(pipe, data) raised exception.
pipe closed by peer or os.write(pipe, data) raised exception.
pipe closed by peer or os.write(pipe, data) raised exception.
pipe closed by peer or os.write(pipe, data) raised exception.
pipe closed by peer or os.write(pipe, data) raised exception.


  


  etc - one line for each webp file

  


• FFmpeg concat - remove source files

  21 février 2017, par VixinG

  I have a folder with 100 .ts mpegts files. I need to concat them together while removing the files as soon as they are joined.

  I need to list files > join file #1 and #2 > delete #1 > repeat.. How do I write it ?

  for f in *.ts; do ffmpeg <what>; rm $f; done</what>