Avoiding usage of specific plugins in decodebin

[Alexander Yanin]

Hi!

My purpose is to build pipeline with decoding and encoding plugins. For encoding purposes I want to use vaapi plugin, while for decoding I want to use decodebin, but without hw acceleration. It seems that when vaapi plugins are installed, decodebin automatically uses them for decoding if possible. How can I forbid decodebin to use these vaapi plugins?

Thanks in advance!

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[Jan Alexander Steffens]

On Fri, Jul 28, 2017 at 8:57 AM Alexander Yanin <[hidden email]> wrote:

How can I forbid decodebin to use these vaapi plugins?

One possibility is to globally forbid autoplugging from considering the elements by setting the rank of the factory to GST_RANK_NONE. Use gst_element_factory_find and gst_plugin_feature_set_rank; the factory is a feature.

Another possibility is to use decodebin's autoplug-select signal to skip the elements when they are considered.

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[Julien Isorce]

Note that gst_plugin_feature_set_rank is per process, in case you were wondering if it affects the registry. So it does not affect other processes.

To support "per pipeline" there is: https://bugzilla.gnome.org/show_bug.cgi?id=705976 

On 28 July 2017 at 08:26, Jan Alexander Steffens <[hidden email]> wrote:

On Fri, Jul 28, 2017 at 8:57 AM Alexander Yanin <[hidden email]> wrote:

How can I forbid decodebin to use these vaapi plugins?

One possibility is to globally forbid autoplugging from considering the elements by setting the rank of the factory to GST_RANK_NONE. Use gst_element_factory_find and gst_plugin_feature_set_rank; the factory is a feature.

Another possibility is to use decodebin's autoplug-select signal to skip the elements when they are considered.

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