Getting "toBuffer() Stream yields empty buffer" error for PDF Conversion

[rbjoshi]

I am getting the below error while converting to PDF:

Error: Stream yields empty buffer

Code is below:

      const readable = toStream(data.Body);
      gm(readable)
      .toBuffer('PDF', (err, buffer) => {
        if(err) {
          logger.error('attachment to pdf buffer', { fileName: doc.fileName })
          return rj(new Error(err)); 
        }

        docs.push({
          docType: doc.type == 2 ? 'Doc1' : (doc.type == 7 ? 'Doc2' : 'Other'),
          filename: doc.fileName.replace(/(\.jpe?g)|(\.png)/i, '.pdf'),
          type: 'application/pdf',
          content: buffer.toString('base64')
        })
        if(doc.type == 7) {
          // Push a second doc for the confirmation page
          docs.push({
            docType: 'CONF_PAGE',
            filename: doc.fileName.replace(/(\.jpe?g)|(\.png)/i, '.pdf'),
            type: 'application/pdf',
            content: buffer.toString('base64')
           })
        }

        rs(docs);
      });

I am getting the error on gm().toBuffer() line

error logs looks like this

Error: Stream yields empty buffer
at Socket. (C:\codebase\onboarding-api\node_modules\gm\lib\command.js:57:17)
at Socket.emit (events.js:203:15)
at Socket.EventEmitter.emit (domain.js:466:23)
at endReadableNT (_stream_readable.js:1145:12)
at process._tickCallback (internal/process/next_tick.js:63:19)

Need some insight here.

[mannu2612]

@rbjoshi Were you able to solve this?

[Bersaelor]

@rbjoshi when you use toBuffer underlying errors are silently swallowed. For example, any issue calling the imagemagick command line utility will not show.
In order to get those, you'll have to use .write(fileImg, (error) => { for testing.

I created an issue about this.