Quality Snapshot


I ask several questions to dig more option
my problem is that the quality (size) of the jpg snapshot is too big.

Is it possible to change the snapshot stream (via gui or ssh)?
Is there more than one quality of snapshot (stream1,2,3)?
Is it possible to lower the definition (via gui or ssh)?

The . generated jpg are 1280 * 720 quality, for integration problems down to 320 x 240 or 480 x 272 for example …

I use this command:

are there variants like:
for stream 3
for stream 2

thank you in advance