I'm using http.request to download JPEG file. I am then using fs.writeFile to try to write the JPEG file out to the hard drive.
None of my JPEG files can be opened, they all show an error (but they do have a file size). I have tried all of the different encodings with fs.writeFile.
What am I messing up in this process?
Here's what the working one is showing when viewing it raw:
And here is what the bad one using fs.writeFile is showing:
Figured it out, needed to use res.setEncoding('binary'); on my http.request.
Thank you, looking to the previous response, I was able to save de media correctly:
fs.writeFile(
filepath + fileName + extension,
mediaReceived, // to use with writeFile
{ encoding: "binary" }, // to use with writeFile ***************WORKING
(err) => {
if (err) {
console.log("An error ocurred while writing the media file.");
return console.log(err);
}
}
);
Related
I call an API which returns a buffer data of a .zip file. I want to read files' buffer data which resides inside the .zip file using its buffer data without saving the .zip file. Is it possible?
Try the zlib library (its a core node.js library - docs: https://nodejs.org/api/zlib.html#zlib), with this example I took from the documentation
const {unzip } = require('node:zlib');
const buffer = Buffer.from('eJzT0yMAAGTvBe8=', 'base64');
unzip(buffer, (err, buffer) => {
if (err) {
console.error('An error occurred:', err);
process.exitCode = 1;
}
console.log(buffer.toString());
});
I have a little problem with node js.
If I save a file with fs.writeFile it saves but the file has no content, but if I read the file and print the content there is content in the file
Thats the node js code to save the file:
let sjson = JSON.parse(fs.readFileSync("./saves/User_VipList.json", "utf8"));
sjson['users'].push({"name": args[0]});
fs.writeFile("./saves/User_VipList.json", JSON.stringify(sjson), (err) => {
if(err) throw err;
});
Thats how i read the content:
let sjson = JSON.parse(fs.readFileSync("./saves/User_VipList.json", "utf8"));
console.log(sjson);
And that's the JSON file:
{
"users": []
}
But in users should be content because
Hope you guys can help me
Due to async nature looks like your program doesnt wait when file write ends occurs, so please try to use fs.writeFileSync instead, for example:
try {
fs.writeFileSync("./saves/User_VipList.json", JSON.stringify(sjson))
} catch(err) {
console.log('Error writing file:', err)
}
Found the Problem
Oh i think i found the problem if i start node index.js with a bat file the problem happends but if i start node manually over cmd it works.
Didn't mention the Bat file because i didn't think thats could be a problem :)
But why is that a problem?
I have a zip file that has a folder like
1234/pic1.png
1234/pic2.png
1234/data.xlsx
I am trying to extract the spreadsheet (failing that, all files) using node-stream-zip.
const StreamZip = require('node-stream-zip');
const zip = new StreamZip({
file: path.join(downloadsDir, fileToFind),
storeEntries: true
});
zip.on('ready', () => {
if(!fs.existsSync('extracted')) {
fs.mkdirSync('extracted');
}
zip.extract('1234/', './extracted', err => {
console.log(err);
});
zip.close();
});
This produces
EBADF: bad file descriptor, read
In the extracted folder is one of the png files. But when following the guide to extract just the xlsx file it appears that the xlsx file is the one causing this error.
zip.extract('1234/data.xlsx', './extracted.xlsx', err => {
console.log(err);
});
Is the problem with the xlsx file? I can open it manually. Is it permissions-related? Node? This particular package?
Your problem is related to zip.close(). You're closing it on the same tick as you're invoking zip.extract().
I'm trying to create a thumbnail from a dash stream m4s file.
I have the mpd, init.mp4 file and the m4s files.
I have the code using nodeJS ffmpeg package that extracts image from an mp4 file:
try {
var process = new ffmpeg('video.mp4');
process.then(function (video) {
// Callback mode
video.fnExtractFrameToJPG('C:\\files\\nodejs', {
start_time: `1:50:30`,
frame_rate : 1,
file_name : 'my_frame_%t_%s'
}, function (error, files) {
if (!error)
console.log('Frames: ' + files);
});
}, function (err) {
console.log('Error: ' + err);
});
} catch (e) {
console.log(e.code);
console.log(e.msg);
}
But because i'm reading my files from a dash-stream i'm getting an m4s files.
I've tried to convert the m4s format into mp4 and then use the code above, but the ffmpeg( fluent-ffmpeg to be exact) is returning an error message
an error occured: ffmpeg exited with code 1:
C:\files\nodejs\testFiles\000000.m4s: Invalid data found when
processing input
The code i used to convert is:
var proc = new fluent({source: "C:\\files\\nodejs\\testFiles\\000000.m4s",
nolog: true})
//useless i think - not working
//proc.setFfmpegPath("C:\\files\\ffmpeg-20170620-ae6f6d4-win64-static\\bin")
proc.withSize('50%').withFps(24).toFormat('mp4')
.on('end', function(){
console.log('file has been converted successfully');
})
.on('error', function(err){
console.log('an error occured: ' + err.message);
})
.saveToFile("C:\\files\\nodejs\\new.mp4");
Is it possible to convert a single m4s file to mp4?
If not, what is the right way of converting m4s to mp4 using ffmpeg with nodejs?
I couldn't find any reference for that, but if it is possible to extract an image directly from the m4s file i think it will solve the problem faster.
It is possible to use this site to download all the *.m4s files, mpd and init.mp4 files using the network section (f12 in Chrome browser) and check the code.
How do you "Convert" a file from one type to another using gm? (e.g .png > .jpg)
I found this but it doesn't seem that the node.js version has the same method:
You'll need to change the format of the output file.
var writeStream = fs.createWriteStream("output.jpg");
gm("img.png").setFormat("jpg").write(writeStream, function(error){
console.log("Finished saving", error);
});
http://aheckmann.github.io/gm/docs.html#setformat