[Bug 784908] v4l2videodec: Implement stable naming scheme for elements

[GStreamer (GNOME Bugzilla)]

https://bugzilla.gnome.org/show_bug.cgi?id=784908

Nicolas Dufresne (stormer) <nicolas at ndufresne.ca> changed:

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--- Comment #17 from Nicolas Dufresne (stormer) <nicolas at ndufresne.ca> ---
Created attachment 355606
  --> https://bugzilla.gnome.org/attachment.cgi?id=355606&action=edit
v4l2videodec: Implement stable element names

Before that, each m2m node would be wrapped as a single, multi-format
decoder element. As a unique name was needed, we where using the device
name, which changes between re-boots. This led to unpredictable element
names. In this patch, we generate an element per codec, using
v4l2<codec>dec name. If there is multiple decoder for the same format,
the following elements will be named v4l2<node><codec>dec.

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