need {ready} also on stderr in stay_open mode

[mahikeulbody]

Python readline function delivers EOF only if the PIPE object is closed, otherwise it blocks my process until a new line is written into the PIPE.
So it would be easier to get stderr output if it has a {ready} mark in the same way as stdout output (in stay_open mode only, of course).

But I am afraid that it could be compatibility issues with existing software using Exiftool.

Michel

[Phil Harvey]

Hi Michel,

You can use the -echo2 to provide an output on stderr.  With ExifTool 9.09 this should also do the necessary flushing.  But you'll have to do this in a separate -execute for this to come after all other stderr output from the command.

- Phil

[mahikeulbody]

I missed -echo2... Thanks !

[Phil Harvey]

Great.  I should mention that 9.09 (to be released in about an hour) is only necessary if you are using -q.  Otherwise earlier versions will do.

- Phil

[mahikeulbody]

Yes, I just tested echo2 with 9.08 and that run well