Streat

Stream to ExifTool

Exposes a Street class that spawns and keeps ExifTool open, using the -stay_open option. Respawns it on failure.

It is much faster than spawning exiftool on each request.

It features an option to limit the amount of data read from the readable stream passed as argument.

It also features the ability to try parsing a readable stream by chunks, and return the tags as soon as ExifTool had enough data.

This is very useful for quick inspection of remote resources, and acts as exiftool "-fast" option - but for all formats, and with more cpu load.

Usage

import Streat from 'streat';

// init code
const streat = new Street({
 step: 32768 // the default step for trying decoding by chunks
});

// start exiftool
streat.start();

// runtime code
streat.run(readableStream, params, function(err, tags) {

});
// multiple times... calls are queued

// close exiftool
streat.stop()

It is also possible to spawn several instances of exiftool, and maintain them using a pool.

The params can be either:

• absent
• a limit (number): max total bytes to read
• an object with limit and step keys

step is the number of bytes to read for each pass.

License

See LICENSE file.

See also

ExifTool by Phil Harvey - Read, Write and Edit Meta Information!