--out doesn't affect traced subprograms.

[mstewartgallus]

Suppose I fork a child worker. Apitrace will process to create a new trace for that child. However, my option of --out won't affect it. This is especially important when the subprocess changes directories.

[jrfonseca]

--out option will affect the first program that uses GL.

You can pass a full path to it BTW.

I think you'll need be more precise on what exactly would like to happen here.

[mstewartgallus]

I think an approach like Valgrind uses should work and that the output option should be a template and not a single string.

--xml-file=

Specifies that Valgrind should send its XML output to the specified
file. It must be used in conjunction with --xml=yes. Any %p or %q
sequences appearing in the filename are expanded in exactly the same
way as they are for --log-file. See the description of --log-file
for details.