v4l2src and dynamic image/jpeg

Matteo Valdina matteo.valdina at gmail.com
Sun Aug 20 03:39:20 UTC 2017

It is probably a basic question but I didn't find a good answer.

I'm trying to write a Bin that it is something like:

v4l2src ! capsfilter! vaapijpegdec ! srcpad

I would like to add and remove jpeg decoder if my target resolution
requires image/jpeg or x-raw.
For example, I have some camera that provides image/jpeg and other that
provide I420.

How can I approach this problem?

Should I configure the caps filter with image/jpeg and I420 and use a probe
query_downstream/upstream to dynamically link/remove the jpegdec?

There is a simpler approach for that?

“There are two ways of constructing a software design: One way is to make
it so simple that there are obviously no deficiencies, and the other way is
to make it so complicated that there are no obvious deficiencies. The first
method is far more difficult.”
- Tony Hoare
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