IssueTracker

A short description of the issue:
When you try to get Image Thumbnail for a video file stored on Google Drive you will get the error:

I suppose the problem could be linked to some blob data manipulation errorw hen converting Blob from/to string.


A small code sample that reliably reproduces the issue. The sample should run as-is or with minimal setup, without external dependencies.

function testDrive() {
  var fileID="1U-_gecMngk-NWEdds-Gyq_Nepes5hiiS";
 
  var video_file=DriveApp.getFileById(fileID); // FileID should be a video File ID stored on GDrive
  var blob=video_file.getThumbnail();
  blob.setName("test.jpg");
  var image_file=DriveApp.getRootFolder().createFile(blob); // This line generate the Exception "Service Error: Drive"
}



You can also reproduce similar problem by manipulating simple blob data:

function testBlob() {
  // This is a simple small image in base64 string to use for testing
  var b64="data:image/jpeg;base64,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";
 
  // Convert base64 to blob
  var blob=Utilities.newBlob(Utilities.base64Decode(b64), "image/jpg", "test.jpg");
 
  // Save blob content as string
  var content=blob.getDataAsString("ISO-8859-1");
 
  // Create new blob and assign content string
  var new_blob=Utilities.newBlob("", "image/jpg", "test.jpg").setDataFromString(content, "ISO-8859-1")
 
  // Get Blob bytes and convert to base64 string
  var new_b64=Utilities.base64Encode(new_blob.getBytes());
 
  // The value of new_b64 shoud be the same as b64
  // true in Rhino engine, false in v8 Engine
  Logger.log(new_b64==b64); // new_b64 value is "/9j/4A=="
}


What steps will reproduce the problem?
1. Create a new Google Apps Script
2. Copy the code above
3. Run the script

What is the expected output? What do you see instead?  If you see error messages, please provide them.



Please provide any additional information below.